際際滷shows by User: puranga / http://www.slideshare.net/images/logo.gif 際際滷shows by User: puranga / Wed, 04 Dec 2013 05:01:37 GMT 際際滷Share feed for 際際滷shows by User: puranga Heterogeneity and Microstructural Features Intervening in the Ductile-Brittle Transition of Ferrite-Pearlite Steels /slideshow/p-uranga-et-al-mst2013/28878102 purangaetal-mst2013-131204050137-phpapp02
In conventional heat treatments or rolling schedules, the microstructure can be properly identified by its mean attributes. These parameters can properly predict the ductile-brittle (DB) transition temperatures measured by Charpy tests. However, if the austenite grain size distribution prior to transformation remains heterogeneous, after transformation, wider distributions of grain sizes will be obtained. In this context, the classical approaches do not properly predict the DB regime. This study analyzes the behavior of several ferrite-pearlite microstructures with different local heterogeneities. Grain size distributions, EBSD analysis identifying high angle misorientation boundaries and cleavage facet measurements were performed. These parameters have been incorporated in previous empirical expressions in order to quantify the contribution of these heterogeneities to the DB transition temperature.]]>
In conventional heat treatments or rolling schedules, the microstructure can be properly identified by its mean attributes. These parameters can properly predict the ductile-brittle (DB) transition temperatures measured by Charpy tests. However, if the austenite grain size distribution prior to transformation remains heterogeneous, after transformation, wider distributions of grain sizes will be obtained. In this context, the classical approaches do not properly predict the DB regime. This study analyzes the behavior of several ferrite-pearlite microstructures with different local heterogeneities. Grain size distributions, EBSD analysis identifying high angle misorientation boundaries and cleavage facet measurements were performed. These parameters have been incorporated in previous empirical expressions in order to quantify the contribution of these heterogeneities to the DB transition temperature.]]> Wed, 04 Dec 2013 05:01:37 GMT /slideshow/p-uranga-et-al-mst2013/28878102 puranga@slideshare.net(puranga) Heterogeneity and Microstructural Features Intervening in the Ductile-Brittle Transition of Ferrite-Pearlite Steels puranga In conventional heat treatments or rolling schedules, the microstructure can be properly identified by its mean attributes. These parameters can properly predict the ductile-brittle (DB) transition temperatures measured by Charpy tests. However, if the austenite grain size distribution prior to transformation remains heterogeneous, after transformation, wider distributions of grain sizes will be obtained. In this context, the classical approaches do not properly predict the DB regime. This study analyzes the behavior of several ferrite-pearlite microstructures with different local heterogeneities. Grain size distributions, EBSD analysis identifying high angle misorientation boundaries and cleavage facet measurements were performed. These parameters have been incorporated in previous empirical expressions in order to quantify the contribution of these heterogeneities to the DB transition temperature. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/purangaetal-mst2013-131204050137-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> In conventional heat treatments or rolling schedules, the microstructure can be properly identified by its mean attributes. These parameters can properly predict the ductile-brittle (DB) transition temperatures measured by Charpy tests. However, if the austenite grain size distribution prior to transformation remains heterogeneous, after transformation, wider distributions of grain sizes will be obtained. In this context, the classical approaches do not properly predict the DB regime. This study analyzes the behavior of several ferrite-pearlite microstructures with different local heterogeneities. Grain size distributions, EBSD analysis identifying high angle misorientation boundaries and cleavage facet measurements were performed. These parameters have been incorporated in previous empirical expressions in order to quantify the contribution of these heterogeneities to the DB transition temperature.
Heterogeneity and Microstructural Features Intervening in the Ductile-Brittle Transition of Ferrite-Pearlite Steels from Pello Uranga
]]> 1186 3 https://cdn.slidesharecdn.com/ss_thumbnails/purangaetal-mst2013-131204050137-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Effects of combining Nb and Mo in HSLA Steels: From austenite conditioning to final microstructure /slideshow/p-uranga-nbmo-jeju-2013slides/28878047 puranga-nbmojeju2013-slides-131204045919-phpapp02
Three main topics are covered in this paper regarding Nb-Mo interactions in microalloyed steels. First, the synergetic behavior of Nb and Mo enhancing solute drag effects and modifying recrystallization and precipitation kinetics in austenite under hot working conditions are analyzed. Then, the effect of different microalloying additions on the final phase transformations will be exposed. In addition to composition and austenite conditioning effect on the phases formed and corresponding CCT diagrams, a quantitative study using EBSD technique has been performed in order to measure unit size distributions and homogeneity of complex microstructures. Finally, the contribution of different strengthening mechanisms to yield strength has been evaluated for different coiling temperatures and compositions.]]>
Three main topics are covered in this paper regarding Nb-Mo interactions in microalloyed steels. First, the synergetic behavior of Nb and Mo enhancing solute drag effects and modifying recrystallization and precipitation kinetics in austenite under hot working conditions are analyzed. Then, the effect of different microalloying additions on the final phase transformations will be exposed. In addition to composition and austenite conditioning effect on the phases formed and corresponding CCT diagrams, a quantitative study using EBSD technique has been performed in order to measure unit size distributions and homogeneity of complex microstructures. Finally, the contribution of different strengthening mechanisms to yield strength has been evaluated for different coiling temperatures and compositions.]]> Wed, 04 Dec 2013 04:59:19 GMT /slideshow/p-uranga-nbmo-jeju-2013slides/28878047 puranga@slideshare.net(puranga) Effects of combining Nb and Mo in HSLA Steels: From austenite conditioning to final microstructure puranga Three main topics are covered in this paper regarding Nb-Mo interactions in microalloyed steels. First, the synergetic behavior of Nb and Mo enhancing solute drag effects and modifying recrystallization and precipitation kinetics in austenite under hot working conditions are analyzed. Then, the effect of different microalloying additions on the final phase transformations will be exposed. In addition to composition and austenite conditioning effect on the phases formed and corresponding CCT diagrams, a quantitative study using EBSD technique has been performed in order to measure unit size distributions and homogeneity of complex microstructures. Finally, the contribution of different strengthening mechanisms to yield strength has been evaluated for different coiling temperatures and compositions. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/puranga-nbmojeju2013-slides-131204045919-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Three main topics are covered in this paper regarding Nb-Mo interactions in microalloyed steels. First, the synergetic behavior of Nb and Mo enhancing solute drag effects and modifying recrystallization and precipitation kinetics in austenite under hot working conditions are analyzed. Then, the effect of different microalloying additions on the final phase transformations will be exposed. In addition to composition and austenite conditioning effect on the phases formed and corresponding CCT diagrams, a quantitative study using EBSD technique has been performed in order to measure unit size distributions and homogeneity of complex microstructures. Finally, the contribution of different strengthening mechanisms to yield strength has been evaluated for different coiling temperatures and compositions.
Effects of combining Nb and Mo in HSLA Steels: From austenite conditioning to final microstructure from Pello Uranga
]]> 1233 3 https://cdn.slidesharecdn.com/ss_thumbnails/puranga-nbmojeju2013-slides-131204045919-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Effect of thermomechanical process on the austenite transformation in Nb-Mo microalloyed steels /slideshow/msampt-10/6059705 mst10-12917244815827-phpapp02
Presentation made at Materials Science and Technology 2010 held in Houston]]>
Presentation made at Materials Science and Technology 2010 held in Houston]]> Tue, 07 Dec 2010 06:27:17 GMT /slideshow/msampt-10/6059705 puranga@slideshare.net(puranga) Effect of thermomechanical process on the austenite transformation in Nb-Mo microalloyed steels puranga Presentation made at Materials Science and Technology 2010 held in Houston <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/mst10-12917244815827-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Presentation made at Materials Science and Technology 2010 held in Houston
Effect of thermomechanical process on the austenite transformation in Nb-Mo microalloyed steels from Pello Uranga
]]> 1065 2 https://cdn.slidesharecdn.com/ss_thumbnails/mst10-12917244815827-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Study of Metadynamic Recrystallization Phenomena in Coarse Grained Nb Microalloyed Austenite /slideshow/mwsp-2002/6059704 mwsp02-12917244638409-phpapp01
Presentation made at Mechanical Working and Steel Processing Conference. Orlando 2002]]>
Presentation made at Mechanical Working and Steel Processing Conference. Orlando 2002]]> Tue, 07 Dec 2010 06:27:16 GMT /slideshow/mwsp-2002/6059704 puranga@slideshare.net(puranga) Study of Metadynamic Recrystallization Phenomena in Coarse Grained Nb Microalloyed Austenite puranga Presentation made at Mechanical Working and Steel Processing Conference. Orlando 2002 <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/mwsp02-12917244638409-phpapp01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Presentation made at Mechanical Working and Steel Processing Conference. Orlando 2002
Study of Metadynamic Recrystallization Phenomena in Coarse Grained Nb Microalloyed Austenite from Pello Uranga
]]> 1089 3 https://cdn.slidesharecdn.com/ss_thumbnails/mwsp02-12917244638409-phpapp01-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Dynamic Recrystallization of a Nb bearing Al-Si TRIP steel /slideshow/msampt-09/6059703 mst09-12917244853278-phpapp02
Presentation made at Materials Science and Technology 2009 held in Pittsburgh]]>
Presentation made at Materials Science and Technology 2009 held in Pittsburgh]]> Tue, 07 Dec 2010 06:27:15 GMT /slideshow/msampt-09/6059703 puranga@slideshare.net(puranga) Dynamic Recrystallization of a Nb bearing Al-Si TRIP steel puranga Presentation made at Materials Science and Technology 2009 held in Pittsburgh <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/mst09-12917244853278-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Presentation made at Materials Science and Technology 2009 held in Pittsburgh
Dynamic Recrystallization of a Nb bearing Al-Si TRIP steel from Pello Uranga
]]> 1171 3 https://cdn.slidesharecdn.com/ss_thumbnails/mst09-12917244853278-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Role of Microalloying Elements during Thin Slab Direct Rolling /slideshow/iom3-2007/6059702 iom32007-12917245012841-phpapp02
Presentation made at Microalloyed Steels conference held in London in 2007]]>
Presentation made at Microalloyed Steels conference held in London in 2007]]> Tue, 07 Dec 2010 06:27:14 GMT /slideshow/iom3-2007/6059702 puranga@slideshare.net(puranga) Role of Microalloying Elements during Thin Slab Direct Rolling puranga Presentation made at Microalloyed Steels conference held in London in 2007 <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/iom32007-12917245012841-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Presentation made at Microalloyed Steels conference held in London in 2007
Role of Microalloying Elements during Thin Slab Direct Rolling from Pello Uranga
]]> 609 2 https://cdn.slidesharecdn.com/ss_thumbnails/iom32007-12917245012841-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Optimization of Rolling Conditions in Nb Microalloyed Steels Processed by Thin Slab Casting and Direct Rolling Route: Processing Maps /slideshow/microas-05/6059701 microas05-12917244660404-phpapp01
Microalloyed Steels Conference 2005 held in San Sebastian]]>
Microalloyed Steels Conference 2005 held in San Sebastian]]> Tue, 07 Dec 2010 06:27:14 GMT /slideshow/microas-05/6059701 puranga@slideshare.net(puranga) Optimization of Rolling Conditions in Nb Microalloyed Steels Processed by Thin Slab Casting and Direct Rolling Route: Processing Maps puranga Microalloyed Steels Conference 2005 held in San Sebastian <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/microas05-12917244660404-phpapp01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Microalloyed Steels Conference 2005 held in San Sebastian
Optimization of Rolling Conditions in Nb Microalloyed Steels Processed by Thin Slab Casting and Direct Rolling Route: Processing Maps from Pello Uranga
]]> 590 2 https://cdn.slidesharecdn.com/ss_thumbnails/microas05-12917244660404-phpapp01-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Effect of Alloying Additions in the Final Microstructure of Nb-Mo steels Processed by Thin Slab Direct Rolling Technologies /slideshow/msampt-08/6059700 mst08-12917244975322-phpapp02
Presentation made at Materials Science and Technology 2008 Conference held in Pittsburgh]]>
Presentation made at Materials Science and Technology 2008 Conference held in Pittsburgh]]> Tue, 07 Dec 2010 06:27:13 GMT /slideshow/msampt-08/6059700 puranga@slideshare.net(puranga) Effect of Alloying Additions in the Final Microstructure of Nb-Mo steels Processed by Thin Slab Direct Rolling Technologies puranga Presentation made at Materials Science and Technology 2008 Conference held in Pittsburgh <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/mst08-12917244975322-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Presentation made at Materials Science and Technology 2008 Conference held in Pittsburgh
Effect of Alloying Additions in the Final Microstructure of Nb-Mo steels Processed by Thin Slab Direct Rolling Technologies from Pello Uranga
]]> 689 3 https://cdn.slidesharecdn.com/ss_thumbnails/mst08-12917244975322-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Avoidance of Microstructural Heterogeneities by Hot Rolling Design in Thin Slab Direct Rolled Niobium Microalloyed Steels /puranga/bac2006 bac2006-12917245057326-phpapp02
Presentation given at Baosteel Conference 2006 held in Shanghai.]]>
Presentation given at Baosteel Conference 2006 held in Shanghai.]]> Tue, 07 Dec 2010 06:27:12 GMT /puranga/bac2006 puranga@slideshare.net(puranga) Avoidance of Microstructural Heterogeneities by Hot Rolling Design in Thin Slab Direct Rolled Niobium Microalloyed Steels puranga Presentation given at Baosteel Conference 2006 held in Shanghai. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/bac2006-12917245057326-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Presentation given at Baosteel Conference 2006 held in Shanghai.
Avoidance of Microstructural Heterogeneities by Hot Rolling Design in Thin Slab Direct Rolled Niobium Microalloyed Steels from Pello Uranga
]]> 467 1 https://cdn.slidesharecdn.com/ss_thumbnails/bac2006-12917245057326-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Ikerlaria ni? /slideshow/ikerlaria-ni/6059393 ikerlariani-101207054812-phpapp01
Elhuyar mintegian Bilbon egindako aurkezpena (2009ko Ekaina). Gazteriaren ikerketarako interes urriaz emandako ikuspegi pertsonala.]]>
Elhuyar mintegian Bilbon egindako aurkezpena (2009ko Ekaina). Gazteriaren ikerketarako interes urriaz emandako ikuspegi pertsonala.]]> Tue, 07 Dec 2010 05:48:08 GMT /slideshow/ikerlaria-ni/6059393 puranga@slideshare.net(puranga) Ikerlaria ni? puranga Elhuyar mintegian Bilbon egindako aurkezpena (2009ko Ekaina). Gazteriaren ikerketarako interes urriaz emandako ikuspegi pertsonala. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/ikerlariani-101207054812-phpapp01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Elhuyar mintegian Bilbon egindako aurkezpena (2009ko Ekaina). Gazteriaren ikerketarako interes urriaz emandako ikuspegi pertsonala.
Ikerlaria ni? from Pello Uranga
]]> 231 1 https://cdn.slidesharecdn.com/ss_thumbnails/ikerlariani-101207054812-phpapp01-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 https://cdn.slidesharecdn.com/profile-photo-puranga-48x48.jpg?cb=1523006274 Materials Science researcher. Broad experience on microstructure evolution modeling, laboratory experiments and industrial process optimization. Project manager for both public and industrial funded research projects. Particularly interested in microalloyed steels (niobium, vanadium, molybdenum,...), phase transformations and modelling. Associate Professor in graduate courses at the University of Navarra. www.ceit.es/index.php?option=com_personal&view=detalle&trbId=294&catId=91&prsId=2&Itemid=25&lang=eu https://cdn.slidesharecdn.com/ss_thumbnails/purangaetal-mst2013-131204050137-phpapp02-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/p-uranga-et-al-mst2013/28878102 Heterogeneity and Micr... https://cdn.slidesharecdn.com/ss_thumbnails/puranga-nbmojeju2013-slides-131204045919-phpapp02-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/p-uranga-nbmo-jeju-2013slides/28878047 Effects of combining N... https://cdn.slidesharecdn.com/ss_thumbnails/mst10-12917244815827-phpapp02-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/msampt-10/6059705 Effect of thermomechan...