Effect of Heat Treatment on Temperature and Stress Distribution during Laser Cladding of 316L Steels

doi:10.3969/j.issn.1004-132X.2024.04.010

Abstract

Abstract: In order to study the control effectiveness of different heat treatment processes on the residual stress of laser cladding, a thermo-mechanics coupling model was established by using ANSYS finite element analysis software. The temperature and stress fields during the laser cladding of 316L stainless steel were simulated under the conditions of preheating(22~900 ℃) before cladding, annealing treatment(200~1000 ℃) after cladding and combined heat treatment before and after cladding. The results show that preheating has the greatest influence on the temperature of molten pool. The temperature of the molten pool increases with the increase of the preheating temperature. Annealing treatment has the best effect on improving the residual stress of laser cladding, and the residual stress is reduced by about 50% at 800 ℃. Comparatively, followed by preheating and annealing treatment, the residual stress is reduced by about 35%. In addition, preheating treatment may also effectively adjust the residual stress, with a reduction of 20% at 500 ℃.

Key words: 316L stainless steel, laser cladding, heat treatment, numerical simulation, residual stress

摘要： 为研究不同热处理工艺对激光熔覆残余应力的调控作用，利用ANSYS有限元分析软件建立了热力耦合模型，对不同温度(22~900 ℃)的熔覆前预热处理、不同温度(200~1000 ℃)的熔覆后退火处理以及熔覆前后协同热处理条件下的激光熔覆316L不锈钢温度场和应力场进行了数值模拟。研究结果表明：预热对熔池温度影响最大，熔池温度随预热温度的增高而增高;退火处理对激光熔覆残余应力的改善效果最好，800 ℃退火处理可使残余应力减小约50%,其次是熔覆前后协同热处理，可使残余应力减小约35%,预热处理对激光熔覆残余应力有一定改善，其中预热500 ℃可使残余应力减小约20%。

关键词: 316L不锈钢, 激光熔覆, 热处理, 数值模拟, 残余应力

CLC Number:

U270

LI Yanle, PAN Zhongtao, QI Xiaoxia, CUI Weiqiang, CHEN Jian, LI Fangyi. Effect of Heat Treatment on Temperature and Stress Distribution during Laser Cladding of 316L Steels[J]. China Mechanical Engineering, 2024, 35(04): 666-677.

李燕乐, 潘忠涛, 戚小霞, 崔维强, 陈健, 李方义. 热处理工艺对激光熔覆316L温度场与应力场的影响规律[J]. 中国机械工程, 2024, 35(04): 666-677.

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