摘要
通过化学成分分析、力学性能复验、金相组织分析、能谱分析、断口扫描等方法对B10合金管材焊接裂纹进行了分析。结果表明,焊接裂纹为管材局部杂质元素(氧)含量超标,在热循环条件下,焊接热影响区粗大晶粒晶界上的低熔点共晶体重新熔化并聚集,降低了合金的高温强度和塑性,在焊接应力的作用下产生的。严格控制原材料和焊接过程中氧、硫、磷、铅、铋等杂质元素的含量,可有效降低因低熔点共晶体热偏析引起的焊接热裂纹。
Welding crack of B10 alloy pipe was analyzed by chemical composition analysis,mechanical property reinspection,metallographic microstructure analysis,energy spectrum analysis and fracture scanning.The results show that the impurity elements(oxygen)content of the pipe is over standard in local area,under thermal cycling,low melting point eutectic remelts and aggregates in coarse grain boundary of heat affected zone,which reduces the high temperature strength and plasticity of alloy.Because of above reasons,welding crack appears under the welding stress.In order to decrease welding crack effectively caused by low melting point eutectic segregation,the content of O,S,P,Bi impurity elements should be strictly controlled in raw materials and welding process.
作者
孙二举
陶欢
孙朋朋
高福阳
雷小伟
SUN Erju;TAO Huan;SUN Pengpeng;GAO Fuyang;LEI Xiaowei(Luoyang Ship Material Research Institute,Luoyang 471023,China)
出处
《热加工工艺》
北大核心
2019年第9期256-258,共3页
Hot Working Technology
作者简介
孙二举(1985-),男,河南许昌人,工程师,硕士,主要从事有色金属制品研究;电话:0379-67256050;E-mail:suntianlan1@163.com
