Solidification crack characteristics and sensitivity of peritectic steel  

作　　者：Ya-qiang Li Jian-hua Liu Zi-ming Wang Ying-ying Li Yang He Xiao-wei Li 

机构地区：[1]Department of Automotive Engineering,Hebei Vocational University of Technology and Engineering,Xingtai 054000,Hebei,China [2]Hebei Special Vehicle Modification Technology Innovation Center,Hebei Vocational University of Technology and Engineering,Xingtai 054000,Hebei,China [3]Institute of Engineering Technology,University of Science and Technology Beijing,Beijing 100083,China [4]School of Petroleum and Natural Gas Engineering,Changzhou University,Changzhou 213164,Jiangsu,China

出　　处：《Journal of Iron and Steel Research International》2024年第7期1668-1679,共12页钢铁研究学报（英文版）

基　　金：financially supported by the Science and Technology Plan Foundation of Xingtai,China (Grant No.2022zz099);the Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology (Grant No.CDYQCY202204);Science and Technology Project of Hebei Education Department (Grant No.ZD2021338).

摘　　要：The characteristics and sensitivity of solidification cracks in peritectic steels were investigated using directional solidifi-cation technology.Interdendritic cracks were observed in both hypoperitectic steels(12CrlMoV,15CrMo)and hyper-peritectic steel(20CrMo)during solidification at growth velocities of 15,50,and 80 pm/s.At the dendritic boundaries,sulphide precipitates were found,promoting crack formation.Based on the statistical analysis of interdendritic cracks in peritectic steels,the area ratio(RA)of interdendritic cracks in a directional solidification structure was proposed to evaluate the crack sensitivity of peritectic steels.Furthermore,the crack sensitivities of peritectic steels(12CrlMoV,15CrMo,and 20CrMo)were tested,evaluated,and compared with the surface crack rates of three types of steels produced from a steel plant.The results demonstrated that RA was in good agreement with that of the steel plant,and the crack sensitivity of 12CrlMoV steel was the strongest,followed by that of 15CrMo and 20CrMo steels.Thus,RA can be used to evaluate the crack sensitivity of peritectic steel.

关 键 词：Peritectic steel-Directional solidification Growth velocity Dendritic structure Solidification crack Crack sensitivity 

分 类 号：TG142.1[一般工业技术—材料科学与工程]