高温长时服役HR3C钢焊接接头的组织与性能  

Microstructure and properties of HR3C steel weld joint exposed to elevated temperature for long-term

作　　者：杜宝帅 刘睿[2] 张忠文 李新梅 

机构地区：[1]国网山东省电力公司电力科学研究院,山东济南250002 [2]山东大学材料液固结构演变与加工教育部重点实验室,山东济南250061

出　　处：《金属热处理》2015年第2期52-55,共4页Heat Treatment of Metals

摘　　要：采用金相显微镜、扫描电镜、X射线衍射仪以及拉伸和弯曲试验研究了高温服役4.2万小时超超临界机组用HR3C钢焊接接头的微观组织和力学性能。结果表明,高温长时服役后HR3C钢焊缝金属中形成了大量条状和颗粒状M23C6析出相,焊接热影响区奥氏体晶粒长大,在晶界附近形成了板状M23C6相。拉伸和弯曲试验结果表明HR3C钢焊接接头高温服役后表现出明显的时效脆化倾向。Microstructure and mechanical properties of HR3 C steel weld joint serviced at high temperature for 42 000 h were investigated by optical microscopy, scanning electron microscopy, X-ray diffractometer, and tensile and bending test. Results show that after high temperature service for long term, large amount of bar-like and granular M23 C6 carbide precipitates in the weld metal of HR3C steel. Coarsened austenite grain was observed in the heat affected zone with some blocky Mz3 C6 carbides along grain boundary. The results of tensile and bending test show that aging embrittlement occurs in the HP,3C steel weld joint after high temperature service for long-term.

关 键 词：HR3C钢 焊接接头 时效脆化 M23C6碳化物 

分 类 号：TG401[金属学及工艺—焊接]