4J36因瓦合金热轧中厚板裂纹缺陷检测及产生原因分析  

Detection and Analysis of Cracking Defect in Hot-Rolled Plate of 4J36 Invar Alloy

作　　者：程云霞[1] 刘国平[1] 李鸿亮 武小强 CHENG Yunxia;LIU Guoping;LI Hongliang;WU Xiaoqiang(Jiuquan Iron and Steel(Group)Co.Ltd.,Jiayuguan 735100,China)

机构地区：[1]酒泉钢铁(集团)有限责任公司,甘肃嘉峪关735100

出　　处：《甘肃冶金》2025年第1期126-129,133,共5页Gansu Metallurgy

基　　金：甘肃省科技重大专项“飞机大型复合材料构件成型模具用合金材料研发及应用(项目编号:22JR9KF037)”。

摘　　要：通过对4J36因瓦合金热轧中厚板裂纹缺陷样的检测分析,确定混晶问题是造成热轧开裂的主要原因。4J36导热系数较低,在连铸凝固过程中会形成梯度较大且持续时间较长的温度场,促进粗大柱状晶的形成产生枝晶偏析。特别是三角区,在热轧轧制后粗晶区与细晶区呈片层状交错分布,显著降低其高温强度,在大变形下导致开裂。The mixed grain structure was determined to be the main cause of hot-rolled plate cracking of 4J36 invar alloy,through the detection and analysis of cracking defect samples.The temperature field with larger gradient and longer duration was formed during the solidification process of continuous casting due to the low thermal conductivity of 4J36 invar alloy,which promoted the formation of thick dendrites and dendrite segregation.The coarse and fine crystal areas were staggered distribution after hot rolling,which significantly reduced its high temperature strength and cracked under large deformation,especially in the triangular area of the solidification structure.

关 键 词：4J36因瓦合金 热轧中厚板 裂纹缺陷 凝固偏析 冷却强度 

分 类 号：TG335.11[金属学及工艺—金属压力加工]