热处理对Cr-Mo钢母材-镍基焊材焊接接头力学性能分布及匹配度的影响  

Effects of Heat Treatment on Mechanical Property Distribution and Matching Degree of Welding Joint of Cr-Mo Steel Base Metal with Ni-based Welding Material

作　　者：彭剑[1] 屠懿 薛智超 缪新婷 刘雪东[1] Peng Jian;Tu Yi;Xue Zhichao;Miao Xinting;Liu Xuedong(School of Mechanical Engineering and Rail Transit,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学机械与轨道交通学院,江苏常州213164

出　　处：《稀有金属材料与工程》2022年第11期4059-4066,共8页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(52075050,52105141);Natural Science Foundation of Jiangsu Province(BK20201448)。

摘　　要：依托数字图像相关技术在表征焊接接头局部力学性能方面的优势,对比研究了原始态、回火态和固溶时效态15CrMoR母材与镍基焊材组成的焊接接头的力学参数、硬度和显微组织。回火处理使焊接熔合区的枝晶组织转变为分散的回火索氏体,提高了力学性能的均匀性,改善了母材区与焊接熔合区力学性能的匹配程度。固溶时效处理促使焊接熔合区的枝晶组织转变为均匀的柱状枝晶组织,同时母材区的珠光体消失、晶粒粗化,导致强度下降,引起焊接熔合区与母材区的不匹配度增大。因此,合适的热处理要求平衡母材区和焊缝区对组织的需要,以获得具有优良综合力学性能的焊接接头。Based on the advantages of digital image correlation method in the characterization of local mechanical property for welding joint,the differences in mechanical property,hardness,and microstructure of as-received,tempered,and solution treatment and aging(STA)-treated welding joints of 15CrMoR base metal with Ni-based welding material were compared.The tempering treatment transforms the dendritic structure into the dispersed tempered sorbite in the welding fusion zone(WFZ).The uniformity of mechanical properties is improved,and the matching degree of mechanical property between base metal zone(BMZ)and WFZ is improved.STA treatment transforms the dendritic structure into the uniform columnar dendrite structure in WFZ,which causes the disappearance of pearlite and the grain coarsening in BMZ,resulting in the degradation of strength and the increase of mismatching degree between WFZ and BMZ.Therefore,the suitable heat treatment needs to balance the requirements of BMZ and WFZ to obtain the excellent comprehensive mechanical property for welding joints.

关 键 词：镍基合金焊接接头 热处理 数字图像相关技术 力学性能分布 

分 类 号：TG156[金属学及工艺—热处理] TG407[金属学及工艺—金属学]