电焊机2024，Vol.54Issue(8)：79-83,5.DOI:10.7512/j.issn.1001-2303.2024.08.10
晶界效应下的焊接热裂倾向判据适用性研究
Applicability Study of Welding Hot Tearing Criterion Involving Grain Boundary Effect
摘要
Abstract
The evaluation of hot cracking susceptibility in the welding of materials is important in the manufacture.In previ-ous studies,the applicability of the hot tearing criteria has always been a hot issue because it did not consider the grain boundary effect.In this paper,taking Al-Cu alloy as an example,the dendrite morphology and solidified path were obtained by a quantitative phase field model of polycrystalline solidification.Based on the solidified path,the applicability of the widely-used hot tearing criteria was studied,including the RDG criterion,Clyne-Davies criterion,and Sindo Kou criterion.It is found that the RDG criterion is consistent with the actual welding hot cracking tendency,and the crack generation is mainly dominated by the pressure drop between dendrites in isolated grain boundary segments.The Clyne-Davies criterion and Sindo Kou criterion result in distortion because some isolated grain boundary intervals are ignored in the calculation pro-cess.Through the research of three criteria,a reference is provided for the evaluation of the hot cracking susceptibilities of materials.关键词
热裂倾向/凝固路径/相场模型/晶界效应Key words
hot cracking susceptibility/solidification path/phase field model/grain boundary effect分类
矿业与冶金引用本文复制引用
韩放,王勇,杨晶,朱晓庆,王瀚,张植航,杨来山,董志波..晶界效应下的焊接热裂倾向判据适用性研究[J].电焊机,2024,54(8):79-83,5.基金项目
SLM制造17-4PH不锈钢微观组织及缺陷动态演化的一体化模拟与定量调控(52375320) （52375320）
