中国电机工程学报2011，Vol.31Issue(11)：92-98,7.
HR3C/T91异种耐热钢焊接接头的力学性能及界面蠕变失效行为研究
Mechanical Properties and Interfacical Creep Failure Behaviors Between HR3C/T91Dissimilar Heat-resistant Steel Welded Joints
姚兵印 1李太江 1刘福广 1李巍 1张建强 2章应霖2
作者信息
- 1. 西安热工研究院有限公司,陕西省,西安市,710032
- 2. 武汉大学动力机械学院,湖北省,武汉市,430072
- 折叠
摘要
Abstract
The properties, creep rupture strength, interfacial creep damage and rupture characteristics of dissimilar welded joint between austenitic heat-resistant steel (HR3C) and martensitic heat-resistant steel (T91) were investigated by means of argon arc welding, high temperature accelerated simulation, creep rupture test, mechanical properties test and microstructure analysis. The research results indicate that the properties of joint are good with the preheat temperature of 448 K. And no post welding heat treatment after accelerated operation 3 004 h. But the interfacial creep failure occures at HR3C/T91 interface after accelerated operation 5 012 h. Creep crack nucleates at HR3C/T91 interface, and propagates along HR3C/T91 interface in the internal face of tube joint. However, creep crack develops in heat affected zone of T91 in the outer face of tube joint. The tensile strength and plasticity of joint decrease obviously, fracture locations are all near the HR3C/T91 interface. Metallographic observations find that the microstructures of HR3C are austenites and carbides, and coarsen seriously, grain boundary are also coarsening. And there are no creep cavities and cracks. However, grains at HR3C/T91 interface zone are coarsening, creep damages are serious, and interfacial creep cracking occures. Therefore, HR3C/T91 interface is the weakest part of HR3C/T91 welded joint.关键词
奥氏体不锈钢/马氏体耐热钢/异种钢焊接接头/蠕变损伤/界面失效分类
矿业与冶金引用本文复制引用
姚兵印,李太江,刘福广,李巍,张建强,章应霖..HR3C/T91异种耐热钢焊接接头的力学性能及界面蠕变失效行为研究[J].中国电机工程学报,2011,31(11):92-98,7.
