A modified Johnson-Cook model for 10%Cr steel at elevated temperatures and a wide range of strain rates
A modified Johnson-Cook model for 10%Cr steel at elevated temperatures and a wide range of strain rates
复制标题
A%20modified%20Johnson-Cook%20model%20for%2010%Cr%20steel%20at%20elevated%20tempels%20and%20a%20wide%20range%20of%20strain%20rates
DOI：
10.1016/j.msea.2017.10.037
复制
发表时间：
2018-02-07
期刊：
影响因子：
6.4
通讯作者：
Zhu, Luo Bei
中科院分区：
文献类型：
--
作者：
He, Jianli;Chen, Fei;Zhu, Luo Bei
在原J-C模型的基础上，进一步发展了10%Cr钢的修正J-C模型，该模型不仅考虑了应变、应变速率和温度的耦合效应，而且考虑了整个变形过程中的硬化和流变软化机制。该模型可以模拟核电设备用钢在高温下的加工硬化、回复和再结晶等多种变形过程。为了建立该模型，进行了不同温度（950-1250 ℃）和应变速率（0.001 s（-1）~ 0.01 s（-1））下的压缩试验，并对不同条件下的显微组织进行了观察。结果表明，应变、应变速率和温度对材料应变硬化的影响不是相互独立的，而是相互作用的。与原J-C模型和实验数据相比，修正后的J-C模型对材料的热变形行为具有较好的预测性。
A modified J-C model of 10%Cr steel, based on the original J-C model, is further developed to consider not only the coupling effects of strains, strain rates and temperatures, but also the mechanism of the hardening and the flow softening during whole deformation processes. The model can simulate multi-deformation processes including work hardening, recovery and recrystallization at the high temperature for use as the nuclear power equipments. To establish this new model, the compression tests at different temperatures (950-1250 degrees C) and strain rates (0.001 s(-1) - 0.01 s(-1)) were conducted and the observations of microstructure under various conditions were performed. The results indicate that the influences of the strain, strain rate and temperature on the strain hardening of material are not independent of each other, while many of them interact. Moreover, Compared with the original J-C model and experimental data, the modified J-C model has good predictability of the hot deformation behavior of material.