Influences of Thermal Martensites and Grain Orientations on Strain-induced Martensites in High Manganese TRIP/TWIP Steels

2011 ◽  
Vol 27 (3) ◽  
pp. 257-265 ◽  
Author(s):  
Fayun Lu ◽  
Ping Yang ◽  
Li Meng ◽  
Fenge Cui ◽  
Hua Ding
Keyword(s):  
High Manganese ◽  
Grain Orientations ◽  
Twip Steels

Fatigue Behavior of High Manganese TWIP Steels and of Low Alloy Q&P Steels for Car-Body Applications

2014 ◽  
Vol 783-786 ◽  
pp. 713-720
Author(s):  
Paolo Matteis ◽  
Giorgio Scavino ◽  
R. Sesana ◽  
F. D’Aiuto ◽  
Donato Firrao
Keyword(s):  
Heat Treatment ◽  
Room Temperature ◽  
Fatigue Behavior ◽  
Austenitic Steels ◽  
Fracture Mechanisms ◽  
High Manganese ◽  
Cold Forming ◽  
Austenitic Structure ◽  
Plasticity Effect ◽  
Twip Steels

The automotive TWIP steels are high-Mn austenitic steels, with a relevant C content, which exhibit a promising combination of strength and toughness, arising from the ductile austenitic structure, which is strengthened by C, and from the TWIP (TWinning Induced Plasticity) effect. The microstructure of the low-alloy Q&P steels consists of martensite and austenite and is obtained by the Quenching and Partitioning (Q&P) heat treatment, which consists of: austenitizing; quenching to the Tqtemperature, comprised between Msand Mf; soaking at the Tppartitioning temperature (Tpbeing equal to or slightly higher than Tq) to allow carbon to diffuse from martensite to austenite; and quenching to room temperature. The fatigue behavior of these steels is examined both in the as-fabricated condition and after pre-straining and welding operations, which are representative of the cold forming and assembling operations performed to fabricate the car-bodies. Moreover, the microscopic fracture mechanisms are assessed by means of fractographic examinations.

Effects of Al addition on deformation and fracture mechanisms in two high manganese TWIP steels

2011 ◽  
Vol 528 (6) ◽  
pp. 2922-2928 ◽  
Author(s):  
Kwang-Geun Chin ◽  
Chung-Yun Kang ◽  
Sang Yong Shin ◽  
Seokmin. Hong ◽  
Sunghak Lee ◽  
...  
Keyword(s):  
Fracture Mechanisms ◽  
High Manganese ◽  
Deformation And Fracture ◽  
Twip Steels ◽  
Al Addition

The Effect of Cooling Conditions on the Evolution of Non-metallic Inclusions in High Manganese TWIP Steels

2016 ◽  
Vol 47 (2) ◽  
pp. 1378-1389 ◽  
Author(s):  
Yu-Nan Wang ◽  
Jian Yang ◽  
Xiu-Ling Xin ◽  
Rui-Zhi Wang ◽  
Long-Yun Xu
Keyword(s):  
High Manganese ◽  
Cooling Conditions ◽  
Metallic Inclusions ◽  
Twip Steels

Wear Resistance under Non-Lubricated Condition of Nb-Containing TWIP Steel

MRS Advances ◽  
2017 ◽  
Vol 2 (61) ◽  
pp. 3765-3771
Author(s):  
V.H. Mercado ◽  
I. Mejía ◽  
Y. Salinas-Escutia ◽  
A. Bedolla-Jacuinde
Keyword(s):  
Wear Resistance ◽  
Twip Steel ◽  
Wear Behavior ◽  
Research Work ◽  
High Strength Steels ◽  
Mechanical Twinning ◽  
High Manganese ◽  
Structural Applications ◽  
Twip Steels ◽  
Nb Addition

ABSTRACTTwinning induced plasticity (TWIP) steels are one of the most attractive advanced high-strength steels for structural applications due to their unique combination of strength and ductility, which is associated with so-called “mechanical twinning”, where twins act as strong obstacles to the dislocation motion. In this context, Nb addition to TWIP steel increases the strength and refines grain size by nanoscale NbC precipitates. Nowadays, high-manganese TWIP steels are extensively studied. However, information in the specialized literature about their tribological properties is limited. This research work studies the wear behavior of high-manganese austenitic Fe–20Mn–1.5Si–1.5Al–0.4C TWIP steel microalloyed with Nb. The wear behavior was evaluated under non-lubricated sliding condition using the “pin-on-ring” technique. As-solution heat treated samples were worn under loads of 53, 104 and 154 N, and at sliding speeds of 0.22, 0.60 and 0.87 m/s. The wear resistance was evaluated in terms of the loss weight. Wear debris and worn surfaces were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (SEM-EDS) and X-ray diffraction (XRD). In general, results show that the wear resistance significantly improves as the sliding speed increases. On the other hand, Nb addition to present TWIP steel produces a slight increase of the wear resistance. Also, it was found that the oxide layer plays a significant role in the wear resistance behavior of this kind of steel.

High temperature deformation behavior of two as-cast high-manganese TWIP steels

2013 ◽  
Vol 582 ◽  
pp. 15-21 ◽  
Author(s):  
A. Khosravifard ◽  
A.S. Hamada ◽  
M.M. Moshksar ◽  
R. Ebrahimi ◽  
D.A. Porter ◽  
...  
Keyword(s):  
High Temperature ◽  
Deformation Behavior ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
High Manganese ◽  
Twip Steels

Implementation of a Constitutive Model for the Mechanical Behavior of TWIP Steels and Validation Simulations

2015 ◽  
Vol 651-653 ◽  
pp. 539-544 ◽  
Author(s):  
Andrea Erhart ◽  
André Haufe ◽  
Alexander Butz ◽  
Maksim Zapara ◽  
Dirk Helm
Keyword(s):  
Constitutive Model ◽  
Metal Forming ◽  
Twip Steel ◽  
Manganese Content ◽  
High Strength ◽  
High Manganese ◽  
Macroscopic Deformation ◽  
Twip Steels ◽  
Stress Dependent ◽  
Crash Loading

High manganese content TWinning Induced Plasticity (TWIP) steels are promising for the production of lightweight components due to their high strength combined with extreme ductility, see [1]. This paper deals with the implementation of a constitutive model for the macroscopic deformation behavior of TWIP steels under mechanical loading with the aim of simulating metal forming processes and representing the behavior of TWIP-steel components – for example under crash loading - with the Finite Element code LS-DYNA®and refers to our recently published papers: [2],[4],[5]. Within the present paper we focus on the implementation of the model formulated in [2] and its extension to stress dependent twinning effects.

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