Rolling-assisted direct energy deposited Inconel 718:Microstructural evolution and mechanical properties after optimized heat treatment  

作　　者：Chen Li Peter Hodgson Michael Preuss Yu Chen Xinhua Wu Yuman Zhu Yang Tian Aijun Huang 

机构地区：[1]Department of Material Science and Engineering,Monash University,Clayton,VIC 3800,Australia [2]Monash Centre for Additive Manufacturing(MCAM),15-17 Normanby Rd,Notting Hill,VIC 3168,Australia [3]Institute for Frontier Materials,Deakin University,Geelong,VIC 3217,Australia [4]Monash Centre for Electron Microscopy,Monash University,10 Innovation Walk,Clayton,VIC 3800,Australia

出　　处：《Journal of Materials Science & Technology》2023年第13期118-127,共10页材料科学技术（英文版）

摘　　要：Post-heat treatment is a necessary and important step for additive-manufactured products to relieve residual stress and to further improve mechanical performance.In this work,the heat treatment strat-egy for Inconel 718 superalloy fabricated by rolling-assisted laser-directed energy deposition(L-DED)has been designed and systematically investigated for the first time.The results show that the designed ho-mogenization heat treatment at 1080℃ for 10 min can effectively dissolve most of the detrimental Lave phases existing in the rolling-assisted L-DED samples.Meanwhile,it results in a homogenous grain struc-ture through static recrystallization,while maintaining a similar prior-refined grain size of∼8μm.On this basis,a high number density ofγ″andγ′precipitates appear in the microstructure after applying a subsequent double-aging heat treatment.The optimized microstructure through such effective post-heat treatment designed in this work has led to a significant increase in material strength at both the room and elevated temperatures while maintaining good ductility.

关 键 词：Additive manufacturing Nickel superalloy In-situ rolling Heat treatment Mechanical properties 

分 类 号：TG132.3[一般工业技术—材料科学与工程]