Effect of heat treatment on the microstructure and recrystallization of an SLM nickel-based superalloy

doi:10.1016/j.mtcomm.2024.109253

IMR OpenIR

	Effect of heat treatment on the microstructure and recrystallization of an SLM nickel-based superalloy
	Zhou, Shuheng 1; Liu, Lirong 1; Yang, Yanhong 2; Lv, Peisen 1
通讯作者	Liu, Lirong(lrliu@sut.edu.cn) ; Yang, Yanhong(yhyang@imr.ac.cn)
	2024-06-01
发表期刊	MATERIALS TODAY COMMUNICATIONS
卷号	39 页码:12
摘要	Heat treatment is essential for selective laser melting (SLM) of nickel-based superalloys. However, the conventional solution heat treatment method of cast superalloys usually leads to serious recrystallization in the samples. The recrystallized grain boundaries under high-temperature conditions reduce the strength of the alloy, which hinders their widespread applications in aerospace. In this work, a nickel-based superalloy with high gamma ' content fabricated by SLM was heat-treated at different solution temperatures. The microstructure of the alloy in different heat-treated states was also characterised. A sub-solvus heat treatment was proposed, which can effectively reduce residual stress and inhibit recrystallization. The microstructure showed that the dislocation density was significantly reduced and recrystallized after the solution heat treatment at 1285 degrees C/2 h+1290 degrees C/2 h+1295 degrees C/4 h and 1250 degrees C/0.5 h, and the proportion of recrystallization were 60.0 % and 42.9 %, respectively. However, after sub-solvus heat treatment at 1240 degrees C/0.5 h, the sample dislocation density decreased and the volume fraction of recrystallization (3.2 %) was slightly higher than that of the as-SLM sample (2.5 %). The sample maintained a strong cubic texture in the build direction. After sub-solvus + aging heat treatment, the microstructure maintained a columnar grain structure. The gamma/gamma ' interfacial dislocation networks and dislocations pile-up were the main dislocation configurations.
关键词	Nickel-based superalloy Selective laser melting Heat treatment Microstructure Recrystallization
资助者	National Science and Tech-nology Major Project ; Science Center for Gas Turbine Project
DOI	10.1016/j.mtcomm.2024.109253
收录类别	SCI
语种	英语
资助项目	National Science and Tech-nology Major Project[Y2019-VII-0011-0151] ; Science Center for Gas Turbine Project[HT-P2022-C-IV-002-001]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:001299007400001
出版者	ELSEVIER
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/189524
专题	中国科学院金属研究所
通讯作者	Liu, Lirong; Yang, Yanhong
作者单位	1.Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Liaoning, Peoples R China 2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Shuheng,Liu, Lirong,Yang, Yanhong,et al. Effect of heat treatment on the microstructure and recrystallization of an SLM nickel-based superalloy[J]. MATERIALS TODAY COMMUNICATIONS,2024,39:12.
APA	Zhou, Shuheng,Liu, Lirong,Yang, Yanhong,&Lv, Peisen.(2024).Effect of heat treatment on the microstructure and recrystallization of an SLM nickel-based superalloy.MATERIALS TODAY COMMUNICATIONS,39,12.
MLA	Zhou, Shuheng,et al."Effect of heat treatment on the microstructure and recrystallization of an SLM nickel-based superalloy".MATERIALS TODAY COMMUNICATIONS 39(2024):12.