超高强钢的焊接冷裂纹敏感性试验研究  

Experimental Study on Welding Cold Cracking Sensitivity of Ultra-high Strength Steel

作　　者：汪贺模[1] 周文浩[1] 程浩轩 WANG Hemu;ZHOU Wenhao;CHENG Haoxuan(Hunan Valin Xiangtan Iron and Steel Co.,LtcL.,Xiangtan 411101,China)

机构地区：[1]湖南华菱湘潭钢铁有限公司,湖南湘潭411101

出　　处：《金属材料与冶金工程》2022年第1期8-11,25,共5页Metal Materials and Metallurgy Engineering

基　　金：湖南省战略性新兴产业科技攻关类项目(2016GK4036)。

摘　　要：采用焊接热影响区最高硬度试验以及斜Y型坡口焊接裂纹试验,对Q1100E超高强钢的焊接冷裂纹敏感性进行了试验研究。结果表明,试验钢Q1100E在不预热以及预热温度为100℃条件下焊接热影响区最高硬度HV_(max)分别为379HV_(10)和398HV_(10);这表明该钢具有一定的冷裂纹倾向。当焊前预热温度为75℃时,试验钢Q1100E的焊缝表面裂纹率达50%以上,断面裂纹率达100%;随着焊前预热温度的增加,其表面及断面裂纹率显著地减少;当焊前预热温度大于125℃,试验钢Q1100E的焊缝表面及断面均未有裂纹产生。The welding cold cracking sensitivity of ultra-high strength steel Q1100E was studied through maximum hardness test on weld heat-affected zone and oblique Y-groove test in this paper.The results show that the maximum hardness in weld heat-affected zone of the test steel is 379 HV10 and 398 HV10 under the condition of no preheating and preheating temperature of 100 respectively,which indicates that the steel has a certain tendency of cold crack.When the preheating temperature is 75℃,the weld surface crack rate and section crack rate of the test steel are above 50%and 100%respectively.With the increase of preheating temperature,the surface crack rate and section crack rate of the test steel decreased significantly.When the preheating temperature is greater than 125 Xi,no crack is found on the weld surface or section of the test steel.

关 键 词：超高强钢 预热温度 裂纹敏感性 Q1100E 线能量 

分 类 号：TG406[金属学及工艺—焊接]