Journal ArticleDOI
Driving Force and Logic of Development of Advanced High Strength Steels for Automotive Applications
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In this article, the authors present the driving forces and logic of development of various high strength steels for automotive applications since 1980s and highlight the importance of crash performance, weight saving, formability, and rigidity.Abstract:
The major scientific and technological advances and breakthroughs of advanced high strength steels (AHSS) were achieved due to the strong demands of automotive industry. The development of AHSS began in the early 1980s with the aim of improving passenger safety and weight-saving. The present paper presents the driving forces and logic of development of various AHSS for automotive applications since 1980s. The importance of crash performance, weight-saving, formability, and rigidity are critically reviewed for the development of new steel grades for automotive applications. The logical sequences of the development of dual phase (DP) steel, transformation induced plasticity (TRIP) steels, tempered DP steels, complex phases (CP) steels, Ferrite-Bainite steels, hot-stamping technology, twinning induced plasticity (TWIP) steels, Quench and Partitioning (Q&P) steels, Medium Mn steels, and steels–polymer composites are presented.read more
Citations
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Journal ArticleDOI
High dislocation density–induced large ductility in deformed and partitioned steels
TL;DR: The deformed and partitioned (D and P) process produced dislocation hardening but retained high ductility, both through the glide of intensive mobile dislocations and by allowing us to control martensitic transformation.
Journal ArticleDOI
Strain localization and damage in dual phase steels investigated by coupled in-situ deformation experiments and crystal plasticity simulations
TL;DR: In this article, a joint analysis of in-situ deformation experiments on two different dual phase (DP) steel grades was conducted using microscopic-digital image correlation (lDIC) techniques to achieve microstructural strain maps of representative statistics and high resolution.
Journal ArticleDOI
Enhanced ductility and toughness in an ultrahigh-strength Mn-Si-Cr-C steel: The great potential of ultrafine filmy retained austenite
TL;DR: In this article, the formation process of the bainitic microstructure as well as martensite and retained austenite was revealed by conducting dilatometry, X-ray diffraction, scanning electron microscopy, electron backscatter diffraction and transmission electron microscope (TEM).
Journal ArticleDOI
High-entropy alloys with heterogeneous microstructure: Processing and mechanical properties
TL;DR: In this article, the authors present an overview of the mechanical behavior of high entropy alloys with heterogeneous microstructures that reconcile the strength-ductility synergy and the ductility trade-off.
Journal Article
Metallographic Methods for Revealing the Multiphase Microstructure of TRIP-Assisted Steels - some applications for steels
TL;DR: In this article, an extension of already known techniques to allow the study of four kinds of TRIP-aided steels was proposed. But this method is restricted to the case of ferrite, bainite, austenite, and martensite.
References
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Journal ArticleDOI
A review on hot stamping
H. Karbasian,A.E. Tekkaya +1 more
TL;DR: In this article, the state of the art in the thermal, mechanical, microstructural, and technological fields of hot stamping is reviewed, and the investigations of all process sequences, from heating of the blank to hot stamps and subsequent further further processes are described.
Journal ArticleDOI
Orientation gradients and geometrically necessary dislocations in ultrafine grained dual-phase steels studied by 2D and 3D EBSD
TL;DR: In this article, orientation gradients and geometrically necessary dislocations (GNDs) in two ultrafine grained dual-phase steels with different martensite particle size and volume fraction were analyzed using high-resolution electron backscatter diffraction (EBSD).
Journal ArticleDOI
Carbon partitioning into austenite after martensite transformation
TL;DR: In this paper, a model is developed to describe the endpoint of carbon partitioning between quenched martensite and retained austenite, in the absence of carbide formation.
Journal ArticleDOI
Kinetics of strain-induced martensitic nucleation
Gregory B. Olson,Morris Cohen +1 more
TL;DR: In this paper, an expression for the volume fraction of martensite vs plastic strain is derived by considering the course of shear-band formation, the probability of shears-band intersections, and probability of an intersection generating a martensitic embryo.