锻压技术

RM80超高强度钢热变形行为及有限元模拟

英文标题：Thermal deformation behavior and finite element simulation on RM80 ultra-high strength steel

分类号：TG142

出版年,卷(期):页码：2023,48(11):212-220

摘要：

利用Gleeble-3180热模拟实验机对RM80超高强度钢在变形温度为900~1100 ℃、应变速率为0.01~10 s-1的条件下进行热压缩实验，根据真应力-真应变曲线，建立了Arrhenius型本构方程，并基于动态材料模型绘制了热加工图；采用有限元软件Deform对RM80钢的热压缩过程进行了模拟，并与实验结果进行了对比。结果表明：RM80钢的流变应力随着应变速率的增大及变形温度的降低显著增大；在变形温度和应变速率分别为1000~1050 ℃和0.01~0.03 s-1以及变形温度和应变速率分别为1050~1100 ℃和0.01~0.10 s-1的条件下，RM80钢具有良好的热加工性能；模拟得到在变形温度为900 ℃、应变速率为0.10 s-1的条件下，试样的真应力-应变曲线与实验结果具有较高的吻合度，证明了所构建的本构方程的准确性。

The thermal compression test of RM80 ultra-high strength steel was carried out at the deformation temperature of 900-1100 ℃ and the strain rate of 0.01-10 s-1 by thermal simulation test machine Gleeble-3180. Then, according to the true stress-true strain curve, Arrhenius type constitutive equation was established, and the thermal processing map was drawn based on the dynamic material model. Furthermore, the thermal compression process of RM80 steel was simulated by finite element software Deform and compared with the test results. The results show that the rheological stress of RM80 steel increases significantly with the increasing of strain rate and the decreasing of deformation temperature. RM80 steel has good thermal working properties under the conditions of the deformation temperature and the strain rate of 1000-1050 ℃ and 0.01-0.03 s-1, respectively, and the deformation temperature and the strain rate of 1050-1100 ℃ and 0.01-0.10 s-1,respectively. The simulation results show that the true stress-strain curve of sample at the deformation temperature of 900 ℃ and the strain rate of 0.10 s-1 is in high agreement with the test results, which proves the accuracy of the constructed constitutive equation.

基金项目：

校企合作项目（2022-07#(522BA3064A) ）

作者简介：苏斌(1974-)，男，博士，工程师，E-mail：subindier2008@126.com

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