首页|Microstructures and mechanical properties of laser-directed energy deposited CrCoNi medium-entropy alloy

Microstructures and mechanical properties of laser-directed energy deposited CrCoNi medium-entropy alloy

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The distinctive intrinsic heat treatment(IHT)originating from cyclic reheating in the laser-directed energy deposition(LDED)has attracted growing attention in recent years.In this investigation,simulations and experimental characterizations were performed to examine the impact of IHT on the microstructure and mechanical properties of LDED-fabricated CrCoNi medium-entropy alloy(MEA).The results show that the intensity of the IHT is proportional to the utilized laser energy density(LED).As the LED increased,significant dynamic recrystallization and grain refinement occurred within the alloy due to the enhanced intensity of IHT.However,the high LED leads to severe hot cracking within the as-built MEA,resulting in inferior ductility.By decreasing LED,the hot cracking was effectively eliminated.Meanwhile,low LED weakened the intensity of IHT and consequently inhibited kinetic con-ditions of dynamic recrystallization,resulting in a hetero-geneous grain structure characterized by multi-scale-sized grains.This structure provides significant hetero-deforma-tion-induced hardening during plastic deformation,enabling the alloy to have a sustainable work-hardening capacity.We expect that this work will have implications in taking full advantage of the unique IHT of the LDED process to fabricate MEAs with excellent metallurgical quality and mechanical performance.

Intrinsic heat treatmentLaser-directed energy depositionCrCoNi MEADynamic recrystallizationHeterogeneous grain structure

Wen-Jie Zhao、Chang-Yu Liu、Peng-Cheng Che、Zhi-Liang Ning、Hong-Bo Fan、Jian-Fei Sun、Yong-Jiang Huang、Alfonso H.W.Ngan

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National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China

Space Environment Simulation Research Infrastructure,Harbin Institute of Technology,Harbin 150001,China

Department of Mechanical Engineering,The University of Hong Kong,Hong Kong 999077,China

funding from Guangdong Province Basic and Applied Research Key ProjectsNational Key R&D Programme,Ministry of Science and Technology of ChinaNational Key R&D Programme,Ministry of Science and Technology of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2020B03010300012018YFB11052002019YFA02099045237110652371025

2024

10.1007/s12598-024-02628-6

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(7)
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