Microstructure and mechanical properties of additive manufactured steel-Al structure materials with nickel gradient layers  

作　　者：刘一搏 孙清洁 桑海波 石俊秒 冯吉才 

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology [2]Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai

出　　处：《China Welding》2016年第1期8-14,共7页中国焊接（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51475104,51435004);the National Basic Research Program of China(2013CB035500)

摘　　要：The microstructure and mechanical properties of steel/Al structure material produced by additive manufacturing （AM） was investigated in this work based on the cold metal transfer welding. The results show that the microstructure gradually changed from the steel side to the aluminum side. The microstructure in the steel layer consisted of vermiform like ferrite and anstenite structure, while in the aluminum layer the microstructure was constituted by c^-A1 grains and typical reticulate distributive Al-Si eutectic structure. Besides, a 7 y.m thickness Ni-Al intermetallic compound layer was emerged at the interface of nickel and aluminum layer. The maximum room-temperature tensile strength of the Steel-Al structure materials was found to be 54 MPa, the rupture morphology showed a brittle fracture characteristic.The microstructure and mechanical properties of steel/Al structure material produced by additive manufacturing （AM） was investigated in this work based on the cold metal transfer welding. The results show that the microstructure gradually changed from the steel side to the aluminum side. The microstructure in the steel layer consisted of vermiform like ferrite and anstenite structure, while in the aluminum layer the microstructure was constituted by c^-A1 grains and typical reticulate distributive Al-Si eutectic structure. Besides, a 7 y.m thickness Ni-Al intermetallic compound layer was emerged at the interface of nickel and aluminum layer. The maximum room-temperature tensile strength of the Steel-Al structure materials was found to be 54 MPa, the rupture morphology showed a brittle fracture characteristic.

关 键 词：additive manufacture AL-FE gradient material microstructure 

分 类 号：TG457.1[金属学及工艺—焊接]