摘要
采用Gleeble-3500D热模拟试验机对铸态42CrMo钢带预置内部裂纹的试样进行了不同工艺参数下的高温压缩实验,模拟裂纹愈合过程,分析工艺参数对内部裂纹愈合的影响及裂纹愈合界面空洞愈合机理。结果表明:随着变形温度、压下量和保温时间的增加,空洞尺寸和数量逐渐降低,裂纹愈合越好;存在一最佳保温时间使裂纹实现良好愈合;当总压下量相同时,压下道次越小,裂纹愈合区的微空洞越少且越小,裂纹的愈合程度越好。铸态42CrMo钢高温变形中界面空洞演变机理包括4步:杂乱锯齿形空洞,不规则形状空洞,扁平形和椭圆形空洞和椭圆形和圆形空洞。
High temperature compression experiments of specimens of as-cast 42CrMo steel with internal pre-cracks were carried out under different process parameters using Gleeble-3500D thermal simulation testing machine to simulate the crack healing process and analyze the influence of process parameters on the internal crack healing and the healing mechanism of interfacial cavity at the crack healing interface.The results show that with the increase of deformation temperature,reduction and holding time,the size and number of cavity decrease gradually,and the crack healing is better.There is an optimal holding time to make the crack heal well.When the overall reduction is same,the smaller the pressure pass,the fewer and smaller the microvoids in the crack healing zone,and the better the crack healing degree.The evolution mechanism of interfacial cavity includes four steps,which are cluttered and serrated cavity,irregularly shaped cavity,penny-shaped and elliptic cavity and elliptic and rounded cavity.
作者
陈园园
齐会萍
李永堂
CHEN Yuan-yuan;QI Hui-ping;LI Yong-tang(Department of Mechanics,Jinzhong University,Jinzhong 030600,China;College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《塑性工程学报》
北大核心
2025年第11期232-241,共10页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51875383)
山西省重点研发计划项目(202202150401007)。
关键词
铸态42CrMo钢
高温变形
工艺参数
裂纹愈合
愈合机理
as-cast 42CrMo steel
high temperature deformation
process parameters
crack healing
healing mechanism
