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 Chen Li;Peter Hodgson;Michael Preuss;Yu Chen;Xinhua Wu;Yuman Zhu;Yang Tian;Aijun Huang

作者机构：Department of Material Science and EngineeringMonash UniversityClaytonVIC 3800Australia Monash Centre for Additive Manufacturing(MCAM)15-17 Normanby RdNotting HillVIC 3168Australia Institute for Frontier MaterialsDeakin UniversityGeelongVIC 3217Australia Monash Centre for Electron MicroscopyMonash University10 Innovation WalkClaytonVIC 3800Australia 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2023年第144卷第13期

页      面：118-127页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The authors wish to acknowledge the use of instruments and scientific and technical assistance at the Monash centre for Electron Microscopy  a Node of Microscopy Australia. Chen Li wants to thank the use of facilities and technical assistance of Dr. Jisheng Ma at the Monash X-ray Platform  and Mr. Matthew Humbert and Dr. Shao Liu for their technical support in instrument setup 

主　　题：Additive manufacturing Nickel superalloy In-situ rolling Heat treatment Mechanical properties 

摘      要：Post-heat treatment is a necessary and important step for additive-manufactured products to relieve residual stress and to further improve mechanical *** 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 *** 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 ***,it results in a homogenous grain struc-ture through static recrystallization,while maintaining a similar prior-refined grain size of∼8μ*** this basis,a high number density ofγ″andγ′precipitates appear in the microstructure after applying a subsequent double-aging heat *** 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.