摘要
针对4 mm厚的中国低活马氏体钢,采用TIG焊接方法分别对预热和未预热两组试样进行了焊接和焊后回火处理,对焊接接头的硬度和微观组织结构进行了测试和观察.结果表明,焊缝区硬度值偏高,靠近母材的热影响区出现较窄的软化带;焊接接头金相组织为板条特征明显的回火马氏体组织,未预热试样的马氏体含量与预热试样相比较,两者之间没有明显的差异.在晶内和晶界处分布大量的碳化物,焊缝区为尺寸较小的棒状,母材和热影响区为尺寸较大的颗粒状,接头的组织和碳化物的析出对焊接接头的硬度有很大的影响.
The preheated and non-preheated 4 mm China low activation martensitic steel(CLAM) plate were welded by TIG welding and post-weld heat treating, and the hardness and microstructure in welded joint were tested and observed.The results show that the hardness in the weld metal is higher and the softening band appears in the heat-affected zone(HAZ) closing to the base metal.The tempered lath martensite is observed in welded joints.There is no significant difference in martensite content between the preheated and non preheated weldments.A large amount of carbide particles are observed in the grains and at the grain boundary.The carbides are small rods in weld metal and large granular in the HAZ and base metal respectively.The microstructure and carbides in welded joints have great effect on the hardness.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2009年第11期9-12,共4页
Transactions of The China Welding Institution
基金
国家973计划基金资助项目(2008CB717802)
江苏大学科技创新团队资助项目(JD000019)
关键词
中国低活马氏体钢
硬度
马氏体
碳化物
China low activation martensitic steel
hardness
martensite
carbide
