Q890D钢焊接冷裂纹敏感性试验研究  

Study on welding cold crack sensibility of the steel Q890D

作　　者：肖红军[1] 田志凌[1] 崔冰[2] 

机构地区：[1]钢铁研究总院焊接研究所,北京市100081 [2]安徽工业大学材料科学与工程学院,马鞍山市243000

出　　处：《焊接》2016年第11期28-33,72-73,共6页Welding & Joining

摘　　要：采用理论计算、最高硬度试验及斜Y型抗裂性试验对Q890D钢的冷裂纹敏感性进行研究,并采用金相显微镜、维式硬度计对斜Y型试样的显微结构和显微硬度进行了测试与分析。结果表明,理论计算和最高硬度试验均表明该钢具有一定的淬硬倾向,在适当的预热条件和湿度下可避免冷裂纹产生。通过硬度试验发现,在冷裂纹的两侧硬度值波动较大,在裂纹部位产生了较大的应力集中。Theoretical calculations,the maximum hardness test and crack resistance test of oblique Y groove were used to study the cold cracking susceptibility of Q890 D steel. Optical microscopy,vickers hardness were used to study the microstructure and hardness of oblique Y groove samples. The theoretical calculation and maximum hardness tests showed that the steel has high tendency to hard quenching. Proper measures must be taken to prevent cold cracking. The hardness fluctuates greatly at the both sides of the cold cracking surfaces,which lead to a great stress concentration.

关 键 词：Q890D 冷裂纹 预热温度 

分 类 号：TG406[金属学及工艺—焊接]