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A Hot Cracking Initiation Criterion Based on Solidification liquid film characteristic and Microstructure

Acta Metallurgica Sinica(English Letters) 2023年第11期36卷 1776-1790页

作者： Ming Su Wentao Zheng Chunyu Yue Bowen Zheng Xiaojiao Zuo Mengyuan He Xiaoguang Yuan School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870China School of Materials Science and Engineering Northeastern UniversityShenyang110870China

Herein,a hot cracking initiation criterion based on the characteristics of solidification liquid film and the microstructure was proposed,which integrated both the mechanical and non-mechanical factors during *** criterion also took the effect of the shrinkage volume of the solid-liquid two-phase in the mushy zone,the flow behavior of the liquid film and the microstructure on the feeding behavior into ***,the effect factors of hot cracking initiation such as alloy composition,microstructure,mold design and process condition were included in this criterion,and it could quantitatively calculate whether hot cracks occurred under a certain state or not during *** criterion was utilized to predict whether hot cracks occurred in Al-4.0 wt%Cu alloy in different initial solidification states or not,which was consistent with the experimental results and verified its *** to the criterion expression,Vfeeding*was related with five effect factors includingη,ΔP*,l*,r*and n,in which r*and n were in positive correlation with Vfeeding*whileη,ΔP*and l*were in negative correlation with that,which provided a good instructive significance for mold design,process optimization and composition and microstructure regulation of alloys and simultaneously further enriched the mechanism and influencing factors of hot cracking ***,a multiscale simulation method for calculating the characteristic parameters of hot tearing behavior during solidification was also provided in this study.

关键词： Hot cracking criterion liquid film characteristic Microstructure Aluminum alloy Multiscale simulation

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