摘要
为准确描述20Cr2Ni4A合金钢的热变形行为,构建其Hansel-Spittel本构模型并实现工程应用,在变形温度为800~1000℃,应变速率为0.001~1 s^(-1)条件下,采用热模拟试验机进行等温压缩试验,基于试验获得真实应力-真实应变数据,构建20Cr2Ni4A合金钢的Hansel-Spittel本构模型,分析模型精度并进行修正,以提高模型预测精度。结果表明修正后模型预测的应力值与试验应力值的相关系数R为0.9811,较修正前提高6.15%,平均绝对相对误差e_(AARE)为5.391%,较修正前降低35.50%。最后采用修正后的本构模型建立材料数据文件,采用Deform-3D软件模拟等温压缩过程,并对比分析数值模拟与等温压缩试验的应力应变数据,以验证模型的可靠性,结果表明,数值模拟的应力值与试验应力值的相关系数R为0.9540,平均绝对相对误差e_(AARE)为5.501%,验证了本构模型的可靠性。
To accurately describe the thermal deformation behavior of 20Cr2Ni4A alloy steel,the Hansel-Spittel constitutive model was constructed and applied in engineering.Under the condition of deformation temperature of 800-1000℃and strain rate of 0.001-1 s^(-1),the isothermal compression tests were carried out by thermal simulation testing machine.Based on the true stress-true strain data obtained from the tests,the Hansel-Spittel constitutive model of 20Cr2Ni4A alloy steel was constructed,the model accuracy was analyzed and the model was modified to improve the model prediction accuracy.The results show that the correlation coefficient R between the stress value predicted by the modified model with the test stress value is 0.9811,6.15%higher than tht before modification,and the average absolute relative error e_(AARE) is 5.391%,35.50%lower than that before modification.Finally,the modified constitutive model was used to build the material data files,and Deform-3D software was used to simulate the isothermal compression process,and the stress and strain data of nu-merical simulation and isothermal compression test were compared and analyzed to verify the reliability of the model,and the results show that the correlation coefficient R between the numerically simulated stress values and the test stress values is 0.9540,and the average ab-solute relative error e_(AARE) is 5.501%,the reliability of the constitutive model is verified.
作者
付胜魁
王伟
马世博
穆振凯
王宝雨
郭自洋
FU Sheng-kui;WANG Wei;MA Shi-bo;MU Zhen-kai;WANG Bao-yu;GUO Zi-yang(School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;Hebei Key Laboratory of Material Near-net Forming Technology,Hebei University of Science and Technology,Shijiazhuang 050018,China;School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《塑性工程学报》
北大核心
2025年第6期195-203,共9页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(52205353)
河北省创新能力提升计划项目(225A2201D)。
