Q890高强钢焊接淬硬倾向和冷裂纹敏感性  

Harden quenching tendency and cold cracking susceptibility of Q890 steel during welding

作　　者：张元杰[1,2] 彭云[1,2] 马成勇[2] 彭杏娜[2] 田志凌[2] 陆建生[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]钢铁研究总院焊接研究所,北京100081

出　　处：《焊接学报》2013年第6期53-56,115-116,共4页Transactions of The China Welding Institution

基　　金：国家973计划资助项目(2010CB630800)

摘　　要：通过焊接热模拟试验、焊接热影响区最高硬度试验以及公式计算,分析了Q890钢的焊接淬硬倾向和冷裂纹敏感性.结果表明,稻垣道夫建立的经验公式比D.Vwer建立的理论经验公式更适用于计算厚板的焊接冷却时间t8/5.Q890钢焊接热影响区的粗晶区具有较强的淬硬倾向,调整焊前预热温度以及焊接热输入,对Q890钢热影响区的淬硬倾向无明显改善,但焊前预热能有效增大冷却时间t100,降低试验钢的焊接冷裂倾向.通过计算机拟合建立了冷却时间t8/5与焊接热影响区过热区硬度的关系式,经过验证该关系式能够对Q890钢最高硬度进行合理的预测.The harden quenching tendency and cold cracking susceptibility of Q890 steel was investigated by welding thermal simulation,maximum hardness test and calculation with empirical formula.The results show that the empirical formula established by Michio Inagaki was more suitable to calculate the cooling time t8/5 during thick plate welding than D·Vwer's theoretical empirical formula.The coarse grain zone in the heat-affected zone(HAZ) of Q890 steel joint had strong harden quenching tendency,controlling the preheating temperature and welding heat input had little effect on improving the harden quenching tendency.However,preheating could significantly increase the welding cooling time t100 and reduce the cold cracking tendency of the steel.Through data fitting,the relationship between the cooling time t8/5 and the hardness of coarse grain zone in HAZ was established and had been verified to predict the maximum hardness of Q890 steel.

关 键 词：Q890 高强钢 淬硬倾向 冷裂纹敏感性 

分 类 号：TG142.3[一般工业技术—材料科学与工程]