摘要
采用连续驱动摩擦焊实现了1045钢与5Cr5MoV模具钢异种钢材的优质高效连接,获得了成形以及力学性能良好的焊接接头。微观组织和力学分析表明:焊缝为马氏体、珠光体和铁素体的混合组织。随着顶锻压力增大,1045钢侧焊接热影响区晶粒度减小,5Cr5MoV模具钢侧焊接淬火区晶粒由粒状变为带状。焊缝处硬度最高,向母材两侧硬度逐步降低,且随着顶锻压力增大,模具钢侧高硬度区增宽,而1045钢侧高硬度区变窄。焊接接头整体抗拉强度随顶锻压力的增加呈现先增加而后趋于稳定,当压力过高时强度略有下降;当顶锻压力在170～210MPa时,焊接接头抗拉强度最大可达到698MPa。焊接接头拉伸断口呈现以解理断裂为主的脆性断裂特征。
Welded joints of 1045 steel and 5 Cr5 MoV dissimilar steels were obtained efficiently by continuous drive friction welding with good formability and mechanical properties.Analyses show that the microstructure of the welded joints is composed of martinets,perlites and ferrites.The grain size of the Heat Affected Zone(HAZ)in 1045 steel decreases,and the microstructure in the quench zone of the 5 Cr5 MoV die steel gradually evolves from granular shape into ribbon-like shape with the increase in the upsetting pressure.The hardness reaches the highest at the welded seams and gradually decreases in the direction of the parent metals.With the increase in upsetting pressure,the hardened zone of the 1045 steel narrows down,but that of the 5 Cr5 MoV die steel broadens.The tensile strength of the welded samples gradually increases up to a stable state with the increase in the upsetting pressure.When the upsetting pressure is in the range of 170 MPa to 210 MPa,the tensilestrength of the welded joints reaches the highest of 698 MPa.Tensile fracture of the welded joints possesses the characteristics of cleavage-based fracture.
作者
宋雨来
谢良稳
王雪竹
刘耀辉
孔祥瑞
杨鹏聪
侯振华
SONG Yu-lai;XIE Liang-wen;WANG Xue-zhu;LIU Yao-hui;KONG Xiang-rui;YANG Peng-cong;HOU Zhen-hua(College of Materials Science and Engineering,Jilin University,Changchun 130022,China;School of Mechanical and Aerospace Engineering,Jilin University,Changchun 130022,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2019年第2期521-528,共8页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金青年基金项目(50901035)
关键词
材料合成与加工工艺
摩擦焊
顶锻压力
模具钢
显微组织
力学性能
materials synthesis and processing technology
friction welding
upsetting pressure
die steel
microstructure
mechanical property
