金属学报  2019, Vol. 55 Issue (12): 1569-1580    DOI: 10.11900/0412.1961.2019.00082
 研究论文 本期目录 | 过刊浏览 |
Q&P钢热处理过程有限元法数值模拟模型研究

Modelling of Q&P Steel Heat Treatment Process Based on Finite Element Method
ZHANG Qingdong,LIN Xiao,LIU Jiyang(),HU Shushan
School of Mechanical and Engineering, University of Science and Technology Beijing, Beijing 100083, China
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Abstract

Quenching and partitioning (Q&P) steel is a kind of high strength and toughness steels which has a majority of martensite at room temperature and a certain amount of retained austenite through the quenching and carbon distribution heat treatment process of cold-rolled carbon-silicon-manganese steel. In this work, the typical Q&P high-strength steel, QP980 steel, is taken as an example to carry out the physical simulation study of the whole process of heat treatment. A creep-like strain equation coupled with temperature and time is proposed to describe the volume change of materials during Q&P heat treatment. The phase transformation kinetics equation, phase transformation strain and phase transformation plasticity equation of Q&P heat treatment with the influence of quenching temperature were established, and the thermal expansion coefficient of each phase of Q&P steel was obtained. According to the coupling principles of temperature, microstructure and stress-strain field, a numerical simulation model for the whole process of Q&P heat treatment was developed. In this model, the physical simulation of QP980 steel thermal-elastoplastic incremental constitutive equations are implemented to commercial finite element software ABAQUS as the user subroutines. The model was validated by Q&P heat treatment experiment on Gleeble thermal-mechanical simulator. The calculated values of the models are both in good agreement with the experimental values.

Key wordsQ&P steel    heat treatment    numerical simulation    experimental research

 ZTFLH: TG156.34

Corresponding author: Jiyang LIU     E-mail: b20170270@xs.ustb.edu.cn

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#### 引用本文:

ZHANG Qingdong, LIN Xiao, LIU Jiyang, HU Shushan. Modelling of Q&P Steel Heat Treatment Process Based on Finite Element Method. Acta Metall Sin, 2019, 55(12): 1569-1580.

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 图1  淬火-分配(Q&P) QP980高强钢的连续冷却实验方案及CCT曲线 图2  不同冷却速率淬火后的常温组织 图3  热膨胀实验及相变动力学实验方案 图4  相变塑性实验方案 图5  不同分配温度的Q&P热处理实验加热冷却制度 图6  无应力淬火及回火过程轴向应变随温度变化的关系曲线 图7  第一次淬火过程马氏体体积分数(ξM1)与淬火温度的关系 图8  不同淬火温度下第二次淬火过程前后的组织变化 图9  不同淬火温度Q&P热处理第二次淬火过程的相变动力学曲线 图10  外载作用下马氏体相变过程的宽向应变 图11  相变塑性系数(k)实测值及线性拟合 图12  不同分配温度下Q&P热处理分配过程中的轴向应变 表1  约化温度系数的三次多项式拟合结果 表2  QP980高强钢类蠕变应变方程系数 图13  类蠕变应变计算值与实测值对比 图14  Gleeble上Q&P热处理实验加热冷却加载制度 图15  模型验证实验试样均热区有限元模型 图16  Q&P热处理过程各阶段试样变形模拟值与实测值对比 图17  Q&P热处理各阶段相体积分数随时间的变化
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