SLM成形316L不锈钢热变形行为研究  

Research on Hot Deformation Behavior of SLM Forming 316L Stainless Steel

作　　者：宗学文[1] 王涛 武伟杰 Zong Xuewen;Wang Tao;Wu Weijie(College of Mechanical Engineering,Xi'an University of Science and Technology,Xi'an 710054,Shaanzi,China;Xian Zhide Automobile Electronic Control Systems Co.,Ltd.,Xi'an 710201,Shaanri,China)

机构地区：[1]西安科技大学机械工程学院,陕西西安710054 [2]西安智德汽车电子控制系统有限公司,陕西西安710201

出　　处：《应用激光》2023年第10期32-40,共9页Applied Laser

基　　金：国家自然科学基金(51875452);陕西省秦创原“科学家+工程师”队伍建设(2022KXJ-012)。

摘　　要：利用Gleeble-3800热模拟压缩试验机研究激光选区熔化(SLM)成形316L不锈钢在变形温度为900~1 100℃、应变速率为0.001~1 s^(-1)时的热变形行为。结果表明,在变形过程中,流变应力会随着变形温度的升高或应变速率的降低而显著降低;建立了适用于变形全过程的应变修正双曲正弦本构模型,并利用统计学参数评估模型精度,其R值高达0.988 63,平均相对误差绝对值为5.45%;绘制激光选区熔化成形316L不锈钢在应变为0.9时的热加工图,结合不同加工区域内微观组织分析,表明失稳机制为绝热剪切带的形成和流动局部化,SLM成形316L不锈钢适合在低应变速率和高温高应变速率条件下进行加工。Based on the hot deformation behavior of selective laser melting forming 316L stainless steel at temperatures of 900~1100℃,strain rates of 0.001~1 s^(-1) was investigated by using the Gleeble-3800 thermal simulator.The results show that the flow stress decreases significantly with the increase of deformation temperature or decrease of strain rate during the deformation process.The strain-modified Arrhenius constitutive model is established for the whole deformation process,and the accuracy of the model is evaluated by using statistical parameters.The R-value of the model is 0.98863 and the average absolute relative error of the model is 5.45%.The hot processing map of SLM forming 316L stainless steel at the strain of 0.9 is drawn,combining with microstructure analysis in different processing areas indicated that the instability mechanism is the formation of adiabatic shear zone and flow localization,and the optimal working conditions for SLM forming 316L stainless steel is low strain rate and high temperature strain rate area.

关 键 词：316L不锈钢 激光选区熔化 应变修正本构模型 热加工图 微观组织 

分 类 号：TG142.71[一般工业技术—材料科学与工程]