This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Overcoming the Paradox of Strength and Ductility in a New Generation of AHSS
Technical Paper
2016-01-0357
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The historical development of autobody steels has demonstrated a paradoxical relationship between strength and ductility, with increasing strength necessary for lightweighting commensurate with reductions in ductility necessary for cold formability. This in turn creates geometric constraints in part design and manufacturing, ultimately limiting usage of these higher strength steel grades in automobiles. Quench and tempering including variants such as quench, partitioning, and tempering are known approaches to increase strength while attempts to overcome the paradox have focused on increasing ductility through three distinct deformation mechanisms including; 1) shear band induced plasticity (SIP), 2) transformation induced plasticity (TRIP), and 3) twinning induced plasticity (TWIP). In this presentation, a new and novel 4th approach is described to overcome this paradox and achieve 3rd Generation Advanced High Strength Steel (AHSS) properties with MPa% higher than 65,000 through the formation of a targeted microstructure consisting of two distinct microconstituent structures which, while having distinct roles in deformation and strengthening, act synergistically to develop novel combinations of strength and ductility. This Mixed Microconstituent structure will be described in detail including its deformation response through sequential stress activated processes resulting in a combination of dislocation dominated mechanisms with formation of characteristic high density dislocation networks, twin / defect annihilation, phase transformation, matrix phase refinement to the nanoscale, and nanoprecipitation. The microstructural pathway and resulting properties, enabled by novel structural formation mechanisms will be presented in detail through a simulation of each stage of the manufacturing process from cast slabs, to hot band coils, cold rolled coils, recrystallized coils, and final deformation during forming operations.
Recommended Content
Authors
Citation
Branagan, D., Frerichs, A., Meacham, B., Cheng, S. et al., "Overcoming the Paradox of Strength and Ductility in a New Generation of AHSS," SAE Technical Paper 2016-01-0357, 2016, https://doi.org/10.4271/2016-01-0357.Also In
References
- Advanced High Strength Steel (AHSS) Applications Guidelines V4.1 World Auto Steel March 15 2009
- 2017 and Later Model Year Light-Duty Vehicle Greenhouse Gas Emissions and Corporate Average Fuel Economy Standards; Final Rule Environmental Protection Agency October 15 2012
- Assessment of Fuel Economy Technologies for Light-Duty Vehicles National Research Council of the National Academies 2011
- A/SP Report Quantifies Mass Compounding Effect During Vehicle Design Report Includes Mass Compounding Calculator for Download and Use World Auto Steel June 8 2013
- Frommeyer , G. ; Brüx , U. Shear band induced plasticity and high-strength of FeMnAlC triplex steels Plasticity 2007: Plasticity of Conventional and Emerging Materials: Theory and Applications 208 210 2007
- Chatterjee S. , Bhadeshia H.K.D.H. Transformation induced plasticity assisted steels: stress or strain affected martensitic transformation? Materials Science and Technology 23 9 1101 1104 2007
- Neu , R. W. Performance and Characterization of TWIP Steels for Automotive Applications Materials Performance and Characterization 2 1 244 284 2013
- Hofmann , H. , Göklü , S. , Gerlach , J. and Brüx , U. Properties of light steels with induced plasticity (LIPÒ steels) Proceedings IDDRG International Deep Drawing Research Group 2004, Conference Germany May 24-26 270 279 2004
- Frommeyer , G. and Brüx , U. Microstructures and mechanical properties of high-strength Fe-Mn-Al-C light-weight TRIPLEX steels Steel Research Int. 77 9-10 627 633 2006
- De Moor E.l. , Gibbs P.J. , Speer J.G. , Matlock D.K. et al Strategies for Third-Generation Advanced High-Strength Steel Development Iron and Steel Technology 7 3 133 143 2010
- Branagan D.J. , Sergueeva A.V. , and Mukherjee A.K. Towards the Development of a New Iron Age Advanced Engineering Materials 8 10 940 943 2006
- Branagan D.J. Engineering Structure on a Nanoscale Level To Achieve Targeted Properties In Steels CALPHAD 31 343 350 2007
- Branagan D.J. , Sergueeva A.V. , Cheng S. , Walleser J.K. , Weznel T.F. , Costa J.V. , Kiilunen W. , Meacham B.E. , Tuffile C.D. Strategies For Developing Bulk Materials NanoTechnology (BMN) Into Industrial Products Material Science and Technology 29 10 1193 1199 2013
- Cheng S. , Sergueeva A.V. , Meacham B.E. , Ma L. , Branagan D.J. Nanostructure Creation in New Class of AHSS at Elevated Temperatures Modern Steel Metallurgy: Design, Processing, and Technological Exploitation, MS&T 2013 Montreal, Canada October 27-31, 2013
- Branagan D.J. , Meacham B.E. , Cheng S. , Ma L. et.al. Material Breakthroughs Leading Toward Next Generation AHSS International Symposium on New Developments in Advanced High-Strength Sheet Steels Vail, Colo. June 23-27, 2013
- Branagan D.J. , Meacham B.E. , Cheng S. , Ma L. , Sergueeva A.V. New Class of 3 rd Generation AHSS Keynote talk, Modern Steel Metallurgy: Design, Processing, and Technological Exploitation, MS&T 2013 Montreal, Canada October 27-31, 2013
- Branagan D.J. Overview of a New Category of 3 rd Generation AHSS SMDI Great Designs in Steel Livonia, Michigan May 1 2013
- Branagan D.J. , Frerichs A.E. , Meacham B.E. , Ma L. , Yakubtsov I.A. , Cheng S. , Sergueeva A.V Non-Traditional Approach for 3 rd Generation AHSS Development Invited talk, MS&T 2014 Pittsburgh, PA October 10-16, 2014
- Sergueeva A.V , Frerichs A.E. , Meacham B.E. , Ma L. , Yakubtsov I.A. , Cheng S. , Branagan D.J. New AHSS in Three Distinct Classes Technical presentation, MS&T 2014 Pittsburgh, PA October 10-16, 2014
- Branagan D.J. Paradigm Changing 3 rd Generation AHSS Keynote talk, International Conference on Metallurgical and Materials Processes, Products, and Applications Raigarh, India January 7th- 9th, 2014
- Branagan D.J. , Frerichs A.E. , Meacham B.E. , Ma L. , Yakubtsov I.A. , Cheng S. , Sergueeva A.V , Parsons C.S. NanoSteel 3 rd Generation AHSS: Auto Evaluation and Technology Expansion Technical presentation, Great Design in Steel 2014, Laurel Manor Conference Center Livonia, MI May 14, 2014
- Branagan D.J. Enabling Factors Toward Production of Nanostructured Steel On an Industrial Scale J. Engineering Material Performance 14 5 9 2005
- Sergueeva A.V. , Meacham B.E. , Cheng S. , Ma L. , Branagan D.J. Dynamic Strain Hardening Mechanism in New Class of AHSS Modern Steel Metallurgy: Design, Processing, and Technological Exploitation, MS&T 2013 Montreal, Canada October 27-31, 2013
- Branagan D.J. , Frerichs A.E. , Meacham B.E. , Ma L. , Yakubtsov I.A. , Cheng S. , Sergueeva A.V New Mechanisms, Enabling Structures, and Advanced Properties Resulting in a New Class of 3 rd Generation AHSS Sheet SAE Technical Paper 2014-01-0989 2014 10.4271/2014-01-0989
- Branagan , D. , Frerichs , A. , Meacham , B. , Ma , L. et al. New Mechanisms, Enabling Structures, and Advanced Properties Resulting in a New Class of 3rd Generation AHSS Sheet SAE Technical Paper 2014-01-0989 2014 10.4271/2014-01-0989
- Cheng S. , Sergueeva A.V. , Meacham B.E. , Ma L. , Branagan D.J Static NanoPhase Refinement in New Classes of AHSS AIST, International Symposium On New Developments in Advanced High Strength Steel Vail, CO June 23-26, 2013
- Sergueeva A.V. , Meacham B.E. , Cheng S. , Ma L. , Branagan D.J. Dynamic NanoPhase Strengthening in New Classes of AHSS AIST, International Symposium On New Developments in Advanced High Strength Steel Vail, CO June 23-26, 2013
- Frerichs A.E. , Sergueeva A.V , Meacham B.E. , Ma L. , Yakubtsov I.A. , Cheng S. , Branagan D.J. Enabling Structures and Mechanisms in Nanostructured Advanced High Strength Steel Technical presentation, AIST 2014 Western Conference Seattle, WA March 27-29, 2014
- Sergueeva A.V. , Frerichs A.E. , Meacham B.E. , Cheng S. , Branagan D.J. Deformation Mechanisms in NanoSteel 3rd Generation AHSS, MS&T 2015 Columbus, OH October 4-8, 2015
- Branagan D.J. , Parsons C.S. , Frerichs A.E. , Meacham B.E. , Cheng S. , Machrowicz T.V. , Sergueeva A.V 3 rd Generation AHSS: From Promise To Reality Invited talk, MS&T 2015 Columbus, OH October 4-8, 2015
- Branagan D.J. , Frerichs A.E. , Meacham B.E. , Cheng S. , Sergueeva A.V. Next Generation of AHSS Sheet for Automotive Application SAE World Congress 2015 Detroit, MI April 21-23, 2015