G115钢TIPTIG焊接接头组织与性能研究  

Study on Microstructure and Properties of TIPTIG Welded Joint of G115 Steel

作　　者：马志宝 郭新芳 姜海峰 蔡文河 杜双明 张学星 董树青 万夫伟 MA Zhibao;GUO Xinfang;JIANG Haifeng;CAI Wenhe;DU Shuangming;ZHANG Xuexing;DONG Shuqing;WAN Fuwei(China Datang Group Science and Technology Research Institute Co.,Ltd.,North China Power Test Research Institute,Beijing 100040,China;Power China Nuclear Power Engineering Co.,Ltd.,Jinan 250000,China;Datang Yuncheng Power Generation Co.,Ltd.,Heze 274700)

机构地区：[1]中国大唐集团科学技术研究总院有限公司华北电力试验研究院,北京100040 [2]中国电建集团核电工程有限公司,山东济南250000 [3]大唐郓城发电有限公司,山东菏泽274700

出　　处：《锅炉技术》2024年第6期51-55,共5页Boiler Technology

摘　　要：基于全自动+脉冲送丝全氩弧焊接方法,研究了新型回火马氏体耐热钢G115厚壁管道焊接接头的组织和性能。结果表明:焊接接头经焊后热处理后组织为回火马氏体,焊缝晶粒呈现出等轴晶和柱状晶两种不同的形貌,热影响区中粗晶区和细晶区均呈现为等轴晶形貌,其晶粒尺寸远小于母材等轴晶的晶粒尺寸,在热影响区未发现液化裂纹。焊接接头的抗拉强度满足标准技术要求,焊缝常温冲击吸收能量平均达到60 J,高于目前焊条电弧焊焊缝的冲击吸收能量,有效解决了G115钢焊缝韧性不足的问题。The microstructure and properties of welded joint of a new tempered martensitic heat-resistant steel G115 thick wall pipe were studied based on the automatic+pulsed wire feeding full argon arc(TIPTIG)welding method.The results show that the microstructure of the welded joint is tempered martensite after post-welding heat treatment,and the weld grains show two different morphologies:equiaxed crystal and columnar crystal.The coarse crystal and fine crystal in the heat affected zone are equiaxed crystal morphologies,and their grain size is much smaller than that of the base metal equiaxed crystal.No liquefaction crack is found in the heat affected zone.The tensile strength of the welded joint meets the standard technical requirements,and the average impact absorption energy of the weld at room temperature reaches 60J,which is higher than that of the current SMAW weld,effectively solving the problem of insufficient toughness of G115 steel weld.

关 键 词：新型马氏体耐热钢 微观组织 力学性能 全自动脉冲送丝氩弧焊 

分 类 号：TG142[一般工业技术—材料科学与工程]