Effect of Microalloying Elements (B, Nb, V and Ti) on the Strain Hardening Behavior of High-Manganese TWIP Steels.

2012 ◽  
Vol 1373 ◽  
Author(s):  
F. Reyes-Calderón ◽  
I. Mejía ◽  
J.M. Cabrera
Keyword(s):  
Strain Hardening ◽  
True Strain ◽  
Research Work ◽  
Strain Hardening Exponent ◽  
High Manganese ◽  
Hardening Behavior ◽  
Slope Change ◽  
Twip Steels ◽  
Microalloying Elements ◽  
Strain Hardening Behavior

ABSTRACTThe present research work analyses the influence of microalloying elements (B, Nb, V and Ti) on the tensile strength and the strain hardening behavior of a high-manganese TWIP steel. The analysis was carried out by means of true stress-true strain curves derived from uniaxial tension tests. The work hardening exponent was determined by using the Hollomon and differential Crussard-Jaoul models. Metallographic characterization was carried out to determine the metallurgical changes associated with n values. The results indicate that the Hollomon analysis results in strain hardening exponent values up to 0.46. On the other hand, the differential Crussard-Jaoul analysis establishes a clear distinction of n value for two stages of plastic deformation which are determined by a sharp slope change in the plot of ln(dσ/dε)-lnε.

Effect of Strain Rate on the Microstructures and Properties of Hot–Rolled TWIP Steel in the Solution Condition

2012 ◽  
Vol 430-432 ◽  
pp. 256-259 ◽  
Author(s):  
Yang Yang ◽  
Chun Fu Li ◽  
Kai Hong Song
Keyword(s):  
Strain Rate ◽  
Strain Hardening ◽  
Twip Steel ◽  
Tensile Tests ◽  
Strain Rate Range ◽  
Strain Hardening Exponent ◽  
Solution Condition ◽  
Twip Steels ◽  
Hot Rolled ◽  
Strain Hardening Behavior

TWIP steel containing 0.21% C, 24.4% Mn, 0.9% Si, 1.84% Al, 4.61% Cr, 1.89% Ni, 0.41% Mo and 0.012% Nb was investigated. Tensile tests of this steel were performed in the strain rate range of 10−4–10−3 s−1. Results indicate that tensile properties of TWIP steel at room temperature are sensitive to strain rate in the studied range. Analyses on the relationship between strain–hardening exponent and strain rates show that the formation of twins during deformation greatly affects the strain–hardening behavior of TWIP steels.

Microstructure and Crystallographic Texture Development of Microalloyed Twinning Induced Plasticity (TWIP) Steels Under Uniaxial Hot-Tensile Conditions

2015 ◽  
Vol 1765 ◽  
pp. 103-108
Author(s):  
A.E. Salas-Reyes ◽  
I. Mejía ◽  
J.M. Cabrera
Keyword(s):  
Crystallographic Texture ◽  
True Strain ◽  
Research Work ◽  
True Strain Rate ◽  
Crystallographic Preferred Orientation ◽  
Factors Affecting ◽  
Low Dislocation Density ◽  
Twip Steels ◽  
Ebsd Technique ◽  
Microalloying Elements

ABSTRACTNowadays, there are limited referenced data on the hot deformation of twinning induced plasticity (TWIP) steels, particularly on the crystallographic preferred orientation (crystallographic texture). It is well know that texture is one of the most important factors affecting sheet metal forming performance. The aim of this research work is to determine the influence of microalloying elements on the microstructure and texture of high-Mn austenitic TWIP steels deformed under uniaxial hot-tensile conditions. For this purpose, one non-microalloyed and other single microalloyed with Ti, V and Mo TWIP steels were melted in an induction furnace and cast into metal and sand molds. Samples with average austenitic grain size between 400 and 2000 µm were deformed in the temperature range between 800 and 900 °C at a constant true strain rate of 10-3 s-1. The evolution of the microstructure and texture near to the fracture tip were characterized using electron back-scattering diffraction (EBSD) technique. The results show that the TWIP steels microalloyed with V and Mo and the non-microalloyed one, solidified in metal mold, exhibit dynamically recrystallized grains oriented in the [012] preferential direction, which was corroborated by local misorientation measurements, indicating low dislocation density. On the other hand, most TWIP steels solidified in sand molds do not show dynamically recrystallized grains, having the largest austenitic grains oriented in the [001]/[101] preferred directions. In general, weak textural Cube {001}<100> combined with <111> fiber, namely γ-fiber, spread from E {111}<110> to Y {111}<112> as major texture components were detected.

The Effect of Precipitate Configuration on the Strain Hardening Behavior of Al-Mg-Si Alloy Sheet

2010 ◽  
Vol 146-147 ◽  
pp. 1163-1169
Author(s):  
Ni Tian ◽  
Gang Zhao ◽  
Bo Nie ◽  
Jian Jun Wang ◽  
Liang Zuo ◽  
...  
Keyword(s):  
Strain Hardening ◽  
True Strain ◽  
Strain Range ◽  
Alloy Sheet ◽  
Strain Hardening Exponent ◽  
Hardening Effect ◽  
Polycrystalline Alloy ◽  
The Matrix ◽  
Strain Hardening Behavior ◽  
Yielding Process

The microstructure especially the size, shape, number and distribution of precipitate, together with the strain hardening exponent n value at different strain range during plastic deformation of the Al-0.9Mg-1.0Si-0.7Cu-0.6Mn alloy sheet, subjected to different heat treatment were investigated. The results showed that the strain hardening exponent n values of Al-0.9Mg-1.0Si-0.7Cu-0.6Mn alloy sheet at any different strain range are different from each other, which is in agreement with the result that the relationship between true strain and true stress of polycrystalline alloy sheet during tensile test does not fully meet the Hollomon formula. The continuous strain hardening exponent nc defined in this paper essentially represents the approximate liner strain hardening effect during the total calculating strain range, while the stage strain hardening exponent ns defined in the paper can objectively indicate the counteraction of the micro strain hardening with the micro strain softening of alloy sheet during plastic deforming. When the precipitate in the matrix of alloy sheet can be cut by dislocation, the alloy sheet has the weakest strain hardening effect at the beginning of yielding process. Otherwise, the alloy sheet has the most prominent strain hardening effect at the beginning of yielding process when the precipitate in the matrix can be bowed bypass operation of dislocation. Gridded precipites is of no advantage to the glide and multiplication of dislocation of alloy sheet.

Effects of twin-dislocation and twin-twin interactions on the strain hardening behavior of TWIP steels

2010 ◽  
Vol 17 (12) ◽  
pp. 70-74 ◽  
Author(s):  
Shu-han Wang ◽  
Zhen-yu Liu ◽  
Guo-dong Wang ◽  
Jun-liang Liu ◽  
Gao-fei Liang ◽  
...  
Keyword(s):  
Strain Hardening ◽  
Hardening Behavior ◽  
Twip Steels ◽  
Strain Hardening Behavior

scholarly journals Extraordinary Room-Temperature Tensile Ductility of Pure Magnesium

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3813
Author(s):  
Du ◽  
Chang ◽  
Chen ◽  
Huo ◽  
Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Strain Hardening ◽  
Microstructural Evolution ◽  
Room Temperature ◽  
Tensile Ductility ◽  
True Strain ◽  
Tensile Behavior ◽  
Deformation Mechanisms ◽  
Hardening Behavior ◽  
Strain Hardening Behavior

Room-temperature tensile behavior and associated deformation mechanisms of multiple-axial forged (MAFed) pure Mg has been investigated. The as-MAFed Mg, with a coarsely recrystallized structure, exhibited a balanced strain-hardening behavior with strain, resulting in extraordinary mechanical properties with high ultimate stress (~200 MPa) and extensive true strain (~0.30). The observation on the microstructural evolution suggests that the balanced strain-hardening behavior is correlated with de-twinning behavior cooperated with pyramidal <c + a> dislocations at the plastic straining stage.

Strain Hardening Behavior of High Performance FBDP, TRIP and TWIP Steels

2011 ◽  
Vol 82 (3) ◽  
pp. 242-248 ◽  
Author(s):  
Ming-hui Cai ◽  
Hua Ding ◽  
Zheng-you Tang ◽  
Hua-ying Lee ◽  
Young-kook Lee
Keyword(s):  
Strain Hardening ◽  
High Performance ◽  
Hardening Behavior ◽  
Twip Steels ◽  
Strain Hardening Behavior

Comprehensive study of strain hardening behavior of CrCoNi medium-entropy alloy

2021 ◽  
pp. 160623
Author(s):  
Bo Guan ◽  
Yitao Wang ◽  
Jianbo Li ◽  
Yu Zhang ◽  
Hao Wang ◽  
...  
Keyword(s):  
Strain Hardening ◽  
Hardening Behavior ◽  
Strain Hardening Behavior ◽  
Comprehensive Study
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