摘要
17Cr2Ni2AH和16Mn R的熔化极活性气体保护电弧焊的难点在于对易淬火钢17Cr2Ni2AH侧熔合线附近和热影响区域微观组织的控制。对预热及层间温度(Preheat And Interpass Temperature,PAIT)进行对比试验,通过分析微观组织形貌,结合综合力学性能测试确定最佳PAIT。结果表明,不同的PAIT对加热速度、焊接最高温度、奥氏体化持续时间、冷却速度等产生较大影响,进而影响焊接接头微观组织和综合性能;PAIT控制在约250℃时,易淬火钢17Cr2Ni2AH侧热影响区以马氏体回火组织为主,化学成分、晶粒分布均匀,熔合线过渡良好,焊接接头综合性能优良。
The difficulty of using metal active gas arc welding （MAG） to weld 17Cr2Ni2AH and 16MnR is how to control the microstructure of fusion line and heat Mfected zone on the side of the easily hardened steel 17Cr2Ni2AH. This project mainly studies the effects of preheat and interpass temperature（PAIT）,through the analysis of nticrostructure,combined with mechanical properties to determine the optimal PAIT. The results show that different PAIT have a significant impact on heating rate,maximum temperature,austenitization duration and cooling rate,then influence the microstructure and the mechanical properties of welding joints. When the PAIT is controlled at about 250℃ ,there are great quantities of tempered martensite in the heat affected zone of easily hardened steel 17Cr2Ni2AH, the region has uniform chemical composition and grain distribution. These parameters can obtain excellent comprehensive property welding joints which have good transition fusion line.
出处
《电焊机》
2016年第12期16-20,共5页
Electric Welding Machine
关键词
异种钢焊接
预热及层间温度
微观组织
力学性能
dissimilar steel welding
preheat and interpass temperature
microstructure
mechanical property
