激光选区熔化成形316L不锈钢断裂性能的有限元模拟与试验验证
Finite Element Simulation and Experimental Verification of Fracture Properties of 316L Stainless Steel Formed by Selective Laser Melting
摘 要
采用晶体塑性有限元法和内聚力模型建立考虑激光选区熔化(SLM)成形316L不锈钢显微组织特征的代表体积单元(RVE)模型,基于模拟得到的应力、应变数据模拟了不同体能量密度SLM成形紧凑拉伸试样的断裂过程,得到J积分曲线并与试验结果进行了对比。结果表明:SLM成形316L不锈钢试样在拉伸过程中内部受力不均匀,在改变内聚力单元最大名义应力后,模拟得到不同体能量密度下各试样的真应力-真应变曲线存在差异,更符合试验结果;不同体能量密度SLM成形试样的J积分模拟值与试验值基本相符,均方根误差在4.66~12.88 kJ·m-2,使用的RVE模型和模拟方法能够有效地模拟得到SLM成形316L不锈钢的断裂韧度。
316L不锈钢
断裂性能
晶体塑性有限元
代表体积单元
selective laser melting
316L stainless steel
fracture property
crystal plastic finite element
representative volume element
Abstract
Representative volume element (RVE) model of 316L stainless steel formed by laser selective melting (SLM) considering the microstructure characteristics was established by crystal plasticity finite element method and cohesion model. Based on the stress and strain datas, the fracture process of the compact tensile specimens formed by SLM with different volume energy densities was simulated, and the J-integral curve was obtained and compared with the experimental results. The results show that the internal stresses of 316L stainless steel specimen formed by SLM were not uniform during tensile deformation. The true stress-true strain curve of specimen under different volume energy densities was different after the maximum nominal stress of cohesion element was changed, which was more consistent with the experimental results. The simulated J-integral values of specimen formed by SLM with different volume energy densities were basically consistent with the experimental values, and the root mean square error was 4.66-12.88 kJ·m-2. The RVE model and the simulation method used could effectively simulate the fracture toughness of 316L stainless steel formed by SLM.
中图分类号 TG142 DOI 10.11973/jxgccl202306016
所属栏目 物理模拟与数值模拟
基金项目 国家自然科学基金资助项目(51575076)
收稿日期 2022/3/14
修改稿日期 2023/2/21
网络出版日期
作者单位点击查看
联系人作者蒋玮
备注谢卓文(1997-),男,河南许昌人,硕士研究生
引用该论文: XIE Zhuowen,JIANG Wei,JIN Jianxing,WU Haonan,YANG Guanghui. Finite Element Simulation and Experimental Verification of Fracture Properties of 316L Stainless Steel Formed by Selective Laser Melting[J]. Materials for mechancial engineering, 2023, 47(6): 90～95
谢卓文,蒋玮,金建行,吴浩楠,杨光辉. 激光选区熔化成形316L不锈钢断裂性能的有限元模拟与试验验证[J]. 机械工程材料, 2023, 47(6): 90～95
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【3】MA M M,WANG Z M,ZENG X Y.A comparison on metallurgical behaviors of 316L stainless steel by selective laser melting and laser cladding deposition[J].Materials Science and Engineering:A,2017,685:265-273.
【4】AHMADI A,MIRZAEIFAR R,MOGHADDAM N S,et al.Effect of manufacturing parameters on mechanical properties of 316L stainless steel parts fabricated by selective laser melting:A computational framework[J].Materials & Design,2016,112:328-338.
【5】ANDANI M T,KARAMOOZ-RAVARI M R,MIRZAEIFAR R,et al. Micromechanics modeling of metallic alloys 3D printed by selective laser melting[J].Materials & Design,2018,137:204-213.
【6】ANDANI M T,GHODRATI M,KARAMOOZ-RAVARI M R,et al.Damage modeling of metallic alloys made by additive manufacturing[J].Materials Science and Engineering:A,2019,743:656-664.
【7】吴文恒,王涛,范玎.增材制造用球形金属粉末主要制备技术的研究进展[J].机械工程材料,2021,45(11):76-83. WU W H,WANG T,FAN D.Research progress on main preparation technologies of spherical metal powder for additive manufacturing[J].Materials for Mechanical Engineering,2021,45(11):76-83.
【8】LI Y Y,JIANG W.DIC-based J-integral evaluation of laser repaired cracks with micro/nanomaterial addition[J].Fatigue & Fracture of Engineering Materials & Structures,2019,42(10):2262-2275.
【9】SONG B,ZHAO X,LI S,et al.Differences in microstructure and properties between selective laser melting and traditional manufacturing for fabrication of metal parts:A review[J].Frontiers of Mechanical Engineering,2015,10(2):111-125.
【10】SURYAWANSHI J,PRASHANTH K G,RAMAMURTY U.Mechanical behavior of selective laser melted 316L stainless steel[J].Materials Science and Engineering:A,2017,696:113-121.
【11】李银银,蒋玮.基于纳米压痕的激光修复层晶体材料常数反演方法[J].机械工程学报,2021,57(2):97-104. LI Y Y,JIANG W.Extracting crystal parameters of laser repaired layer by nanoindentation[J].Journal of Mechanical Engineering,2021,57(2):97-104.
【12】TALJAT B,PHARR G M.Development of pile-up during spherical indentation of elastic-plastic solids[J].International Journal of Solids and Structures,2004,41(14):3891-3904.
【13】BARTIER O,HERNOT X,MAUVOISIN G.Theoretical and experimental analysis of contact radius for spherical indentation[J].Mechanics of Materials,2010,42(6):640-656.
【14】LEDBETTER H M.Monocrystal-polycrystal elastic constants of a stainless steel[J].Physica Status Solidi (a),1984,85(1):89-96.
【15】GONZALEZ D,KELLEHER J F,QUINTA DA FONSECA J,et al.Macro and intergranular stress responses of austenitic stainless steel to 90° strain path changes[J].Materials Science and Engineering:A,2012,546:263-271.
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【18】HUANG Y G.A user-material subroutine incorporating single crystal plasticity in the ABAQUS finite element program[D].Cambridge:Harvard University,1991.
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【20】WANG D,SONG C H,YANG Y Q,et al.Investigation of crystal growth mechanism during selective laser melting and mechanical property characterization of 316L stainless steel parts[J].Materials & Design,2016,100:291-299.
【21】SIMONOVSKI I,CIZELJ L.Cohesive element approach to grain level modelling of intergranular cracking[J].Engineering Fracture Mechanics,2013,110:364-377.
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