基于修正C-J法和RVE模型的780MPa级冷轧双相钢的应变硬化行为

发布时间：2018-11-27 17:12

【摘要】：针对经不同工艺热处理的780 MPa级冷轧双相钢板,采用修正的C-J(Crussard-Jaoul)法分析了应变硬化行为,并基于真实组织形貌的代表性体积单元(Representative volume element,RVE)模型模拟其形变行为。结果表明:不同状态的实验钢均表现出较高的初始应变硬化率。岛状和针状马氏体表现出两阶段应变硬化特征,依次对应铁素体塑性变形和铁素体/马氏体协同塑性变形;当马氏体为粗大块状呈现三阶段应变硬化特征,其中第三阶段主要发生马氏体塑性变形时应变硬化能力下降明显。模拟结果表明:当块状和针状马氏体的应变集中分布在铁素体和马氏体界面,岛状马氏体的应变集中分布在马氏体块的连接部位。
[Abstract]:A modified C-J (Crussard-Jaoul) method was used to analyze the strain hardening behavior of 780 MPa cold-rolled duplex steel plates after different heat treatment. The representative volume unit (Representative volume element, based on the real microstructure morphology was used to analyze the strain hardening behavior. RVE) model is used to simulate its deformation behavior. The results show that the initial strain hardening rate is higher for all the experimental steels in different states. Island and acicular martensite show two stages of strain hardening, corresponding to ferrite plastic deformation and ferrite / martensite co-plastic deformation. The strain hardening ability of martensite decreases obviously when martensite is coarse and bulky, and the strain hardening ability decreases obviously when martensite is plastic deformed in the third stage. The simulation results show that when the strain of bulk and acicular martensite is concentrated at the interface between ferrite and martensite, the strain of island martensite is concentrated at the junction of martensite block.
【作者单位】：西南交通大学材料科学与工程学院;西南交通大学材料先进技术教育部重点实验室;
【基金】：四川省科技支撑计划~~
【分类号】：TG142.1

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