T91/TP347H异种钢焊接接头性能分析

Performance Analysis of the T91 / TP347H Dissimilar Steel Welded Joints

近年来,随着大容量、高参数和低排放的超(超)临界机组的大力发展,相应地对电站设备中的金属部件要求也越来越高,因此在这些机组的受热面中不可避免地存在为数较多的异种钢焊接接头,如铁素体钢T91和奥氏体钢TP347H异种钢焊接接头。由于异种钢焊接接头处经常会发生开裂等早期失效现象,针对此问题开展了异种钢焊接接头的性能分析试验研究,主要研究对象为奥氏体钢TP347H和马氏体钢T91异种钢焊接接头,试验研究了接头各微区的显微组织、显微硬度及其力学性能,并利用扫描电镜进行能谱分析,得出相关结论,为异种钢焊接接头在长期高温、高压状态下安全运行以及其可靠性提供参考依据。

Nowdays, as the development of the larger capacity and higher parameter of the supercritical and ultra-su- percritical generating units, corresponding requirements for the metal parts of the power plant equipment is becoming higher,so it is inevitable for the units heated face to have large number of dissimilar steel welded joints, such as fer- rite steel T91 and austenitic steel TP347H dissimilar steel welded joints. Due to the frequent cracking of dissimilar steel welded joints and in order to solve this problem we carried out dissimilar steel welding joint performance analy- sis study,austenitic steel TP347H and martensitic steel T91 dissimilar steel welding joint were mainly studied in this paper, every micro zone microstructure, microhardness and mechanical properties of the joint were studied, and the energy spectrum was analyzed by scanning electron microscope, the relevant conclusions was drawn in the end. It pro- vided reference for safe and reliable operation of dissimilar steel welded joint operating in high temperature and pres- sure in long term.