Effect of two-step cooling process on mechanical properties of TRIP steel with high performance

被引：0
|
作者：
M.L. Li
H. Jiang
Y.L. He
L.B. Chen
G.T. Zhang
H. Wang
X.G. Lu
L. Li
机构：
[1] Shanghai University,School of Materials Science and Engineering
[2] Shanghai University,State Key Laboratory of Advanced Special Steel
[3] Pangang Group Research Institute,undefined
来源：
Journal of Iron and Steel Research International | 2018年 / 25卷
关键词：
Transformation-induced plasticity steel; Two-step cooling; Microstructure; Mechanical property;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A novel two-step cooling experiment was established to simulate the slow cooling process of continuous annealing production line for transformation-induced plasticity (TRIP) steel. The microstructures and mechanical properties of TRIP steel soaked at 700 °C for different time were investigated by tensile test, scanning electron microscopy, X-ray diffraction, and thermodynamic and kinetic calculation. It is shown that the steel soaked for 15 s exhibits the optimal product of strength and elongation (PSE > 30,000 MPa%) due to the transformation of austenite to proeutectoid ferrite, which delays the bainite transformation and improves the stability of retained austenite. In addition, the mechanical properties of TRIP steel soaked over 30 s are much lower, resulting from the precipitation of cementite, which decreases the stability of retained austenite and weakens the TRIP effect.
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页码：426 / 432
页数：6
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