Effect of heating temperature on the microstructure evolution of a Zn-Al-Mg coating on press-hardened steel  

作　　者：BI Wenzhen JIN Xinyan WEI Xicheng 

机构地区：[1]School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China [2]Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201999,China [3]State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel),Shanghai201999,China

出　　处：《Baosteel Technical Research》2023年第1期39-47,共9页宝钢技术研究（英文版）

摘　　要：This paper addresses the microstructure evolution in the Zn-1.2Al-1.2Mg coating of press-hardened steel during heat treatment at temperatures ranging from 600 ℃ to 900 ℃.The presence of aluminum in the coating leads to substantial variation in the chemical composition and microstructure within the heat-treated layer.As the heat treatment temperature increases, the original Fe_(2)Al_(5) barrier layer between the coating layer and steel substrate is progressively dissolved and replaced by the aggregates of a new(FeAl) phase.At higher heat treatment temperatures, the(FeAl) phase gradually migrates to the subsurface layer of the coating.Meanwhile, Zn/Fe interdiffusion induces Γ-Fe_(3)Zn_(10)-phase formation in the original coating layer and α-Fe(Zn) solid solution formation at the zinc-substrate interface.These microstructure features suppress the high-temperature oxidation and evaporation of Zn.

关 键 词：Zn-1.2AI-1.2Mg press-hardened heat treatment FEAL oxidation 

分 类 号：U466[机械工程—车辆工程] TG156[交通运输工程—载运工具运用工程] TG174.4[交通运输工程—道路与铁道工程]