Evolution of Microstructure and Properties of SLM Formed Inconel 738 Alloy During Stress Relief Annealing

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	Evolution of Microstructure and Properties of SLM Formed Inconel 738 Alloy During Stress Relief Annealing
	Ding, Yutian 2; Wang, Hao 2; Xu, Jiayu 2; Hu, Yong 2; Zhang, Dong 1
刊名	Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
	2020-12-01
卷号	49 期号:12 页码:4311-4320
关键词	Annealing Carbides Grain boundaries Melting Microhardness Microstructural evolution Precipitation (chemical) Residual stresses Selective laser melting Tensile strength Annealing temperatures Grain boundary carbides Melting and solidification Micro-structure evolutions Microstructure and properties Precipitation behavior Selective laser melting (SLM) Stress relief annealing
ISSN号	1002185X
英文摘要	Due to the characteristics of rapid melting and solidification of selective laser melting (SLM) process in preparing Inconel 738 alloy, there is residual stress in alloy, so the alloy cannot be directly used. Thus, stress relief annealing is required. The evolution of residual stress, precipitation behavior, microstructure and properties of the alloy after annealing at different temperatures (700~900) for 24 h was studied. The results show that the microstructure evolution mechanism is static recovery, while dislocation migration, rearrangement and grain boundary style change occur and a bimodal distribution of spherical γ' phase (50~250 nm) and short rod-shaped γ' phase (240~440 nm) are formed. The grain boundary carbides change from a dotted state to a continuous one and the type of carbides changes from MC to M23C6; after annealing at 800, the residual stress decreases from 380.94 MPa (as-SLMed) to -66.7 MPa, indicating the residual stress is eliminated. With the annealing temperature increasing, the microhardness and tensile strength first increase and then decrease, and the elongation increases gradually. The alloy annealed at 800 has the highest microhardness (HV) and tensile strength (5812, 1330 MPa), which are 1.42 and 1.41 times of those of as-cast alloy (4100, 945 MPa), respectively. © 2020, Science Press. All right reserved.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	中文
出版者	Science Press
WOS记录号	WOS:000607448600040
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150873]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
作者单位	1.State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchuan Group Co., Ltd, Jinchang; 737100, China 2.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Ding, Yutian,Wang, Hao,Xu, Jiayu,et al. Evolution of Microstructure and Properties of SLM Formed Inconel 738 Alloy During Stress Relief Annealing[J]. Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering,2020,49(12):4311-4320.
APA	Ding, Yutian,Wang, Hao,Xu, Jiayu,Hu, Yong,&Zhang, Dong.(2020).Evolution of Microstructure and Properties of SLM Formed Inconel 738 Alloy During Stress Relief Annealing.Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering,49(12),4311-4320.
MLA	Ding, Yutian,et al."Evolution of Microstructure and Properties of SLM Formed Inconel 738 Alloy During Stress Relief Annealing".Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering 49.12(2020):4311-4320.