摘要
在机加工基体零件上通过选区激光熔化技术成形复杂结构零件时,在界面处容易产生较大的残余应力。利用ANSYS(APDL)建立了基于SLM工艺的复合成形316L不锈钢的单层多道三维瞬态数值模型并与试验结果对照。基于复合成形316L不锈钢的有限元模型,研究了复合成形过程中温度场、应力场的分布和演变,分析了预热温度对熔池热行为、应力演变以及残余应力分布的影响。结果表明:随着预热温度的升高,最大冷却速率、熔池边界温度梯度和残余应力均降低。
When complex structure parts are formed on machined matrix parts by selective laser melting(SLM) technology, large residual stress is easily generated at the interface. The single-layer multi-channel three-dimensional transient numerical model of composite forming 316 L stainless steel based on SLM process was established by using ANSYS(APDL) and compared with the experimental results. Based on the finite element model of composite forming 316 L stainless steel, the distribution and evolution of temperature field and stress field during composite forming were studied, and the effects of preheating temperature on the thermal behavior, stress evolution, and residual stress distribution of molten pool were analyzed. The results show that the maximum cooling rate, the boundary temperature gradient and the residual stress decrease with the increase of preheating temperature.
作者
李忠华
李嘉新
刘斌
蒯泽宙
杨志成
杨帅
Li Zhonghua;Li Jiaxin;Liu Bin;Kuai Zezhou;Yang Zhicheng;Yang Shuai(School of Mechanical Engineering,North University of China,Taiyuan,Shanxi 030051,China;School of Materials Science and Engineering,North University of China,Taiyuan,Shanxi 030051,China;不详)
出处
《应用激光》
CSCD
北大核心
2022年第8期61-71,共11页
Applied Laser
基金
国家自然科学基金(52075502
51905497)
山西省高校科技创新计划(2019l0559)
中北大学青年学术带头人(QX201902)。
关键词
选区激光熔化
316L
数值模拟
残余应力
selective laser melting
316L
numerical simulation
residual stress
