机电工程技术2025，Vol.54Issue(16)：35-42,120,9.DOI:10.3969/j.issn.1009-9492.2025.16.007
激光锻造复合电弧增材修复DH36钢的高温本构模型修正
Correction of High-temperature Constitutive Model for Laser Forging Composite Arc Additive Repair of DH36 Steel
摘要
Abstract
Laser forging composite arc repair technology can effectively improve the porosity defects in the repair area.By using finite element simulation method to study the evolution law of porosity defects under laser forging,theoretical guidance and reference can be provided for the optimization of laser forging composite arc repair process.Due to the fact that laser forging is applied to metals at high temperatures,in order to improve the accuracy of simulation results,it is necessary to construct a constitutive model that can more accurately describe the high-temperature rheological behavior of metals.Taking DH36 steel,which is widely used in the field of offshore wind power,as the research object,a universal testing machine is used to conduct tensile tests on DH36 steel at different temperatures and strain rates,with temperatures ranging from 20～1 000℃and strain rates ranging from 0.01～0.1 s-1.Based on the tensile stress-strain curve,the strain strengthening term and temperature softening term in the Johnson Cook(J-C)constitutive model are modified,and a high-temperature modified J-C constitutive model suitable for DH36 steel is proposed.The correlation coefficient R and average relative error EAAR between the predicted stress and experimental measurements of the modified J-C constitutive model are evaluated.The results show that R is 0.939 18 and EAAR is 6.799 9%,indicating that the high-temperature modified J-C constitutive model has good stress prediction ability.Then,the J-C constitutive model and the high-temperature modified J-C constitutive model are respectively used for finite element simulation of the evolution of pore defects under laser forging.The results show that different constitutive models have a significant impact on the simulation results.The high-temperature modified J-C constitutive model predict a larger change in pore size than the J-C constitutive model,which is related to the fact that the modified model considering the thermal deformation behavior of materials under high-temperature conditions.关键词
DH36钢/激光锻造/Johnson-Cook模型/高温修正Key words
DH36 steel/laser forging/Johnson Cook mode/high temperature correction分类
矿业与冶金引用本文复制引用
汤丰铭,池元清,蔡舒鹏,余立志,胡振伟,张永康..激光锻造复合电弧增材修复DH36钢的高温本构模型修正[J].机电工程技术,2025,54(16):35-42,120,9.基金项目
广东省海洋经济发展(海洋六大产业)专项资金项目(粤自然资合[2023]28号) （海洋六大产业）
广东省基础与应用基础研究基金项目(粤基金字[2023]6号,粤基金字[2022]18号) （粤基金字[2023]6号,粤基金字[2022]18号）
