焊管2024，Vol.47Issue(2)：57-62,6.DOI:10.19291/j.cnki.1001-3938.2024.02.009
大壁厚NiCrMoV钢的窄间隙焊接工艺与接头性能
Narrow Gap Welding Process and Joint Performance of NiCrMoV Steel with Large Wall Thickness
摘要
Abstract
The weldability of the material largewall NiCrMoV steel for the rotor of power station equipment was analyzed,and the narrow gap submerged arc welding was used to obtain a integrity welded joint,and the microstructure,hardness,tensile and bending properties of the welded joint were analyzed.The results show that the whole welded joint is completely metallurgically bonded,and has no defects.The microstructure of weld metal is consisted of tempered bainite and small amount of tempered martensite,the CGHAZ and FGHAZ are the tempered martensite and a small amount of carbide distributed in grain boundaries,and the base metal is a mixed microstructure of tempered bainite + tempered martensite.The micorhardness of CGHAZ is the highest,and the hardness of the weld is slightly lower than that of the base metal.The tensile strength of the welded joint gradually decreases with the increase of temperature.No microcracks were found in the 180° bending performance test of the welded joint,indicating that the ductility of the entire welded joint was good.关键词
大壁厚/NiCrMoV钢/窄间隙焊接/显微组织/性能Key words
large wall thickness/NiCrMoV steel/narrow gap welding/microstructure/performance分类
矿业与冶金引用本文复制引用
郭洋,董志伟,李代龙,唐定狼,张永强,徐健,许德星,张国荣..大壁厚NiCrMoV钢的窄间隙焊接工艺与接头性能[J].焊管,2024,47(2):57-62,6.基金项目
国家重点研发计划"面向载能束增材修复与再制造的集约化合金设计与制备"(项目编号2018YFB1105803). （项目编号2018YFB1105803）
