Effects of sub-solvus ageing on the tensile and creep properties of a new cast nickel-based superalloy

doi:10.1016/j.jmst.2024.06.014

IMR OpenIR

	Effects of sub-solvus ageing on the tensile and creep properties of a new cast nickel-based superalloy
	Zhao, Peng-Fei 1,2; Hou, Kun-Lei 1,3; Wang, Min 1,3; Ou, Mei-Qiong 1,3; Yang, Ya-qian 1,3; Ma, Ying-Che 1,3
通讯作者	Wang, Min(minwang@imr.ac.cn) ; Ma, Ying-Che(ycma@imr.ac.cn)
	2025-03-20
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	212 页码:289-302
摘要	For nickel-based superalloys with medium volume-fraction gamma ' phase (20 %-40 %), dual or multi-stage aging treatments are usually conducted to generate a microstructure containing the multimodal distribution of gamma ' for a balance of strength and plasticity. In the present study, the microstructure and hightemperature properties of a novel cast nickel-based superalloy K4800 were investigated after being subjected to three heat treatments (HT) procedures, namely HT1: 1180 degrees C/4 h + 1090 degrees C/2 h + 800 degrees C/16 h, HT2: 1180 degrees C/4 h + 1060 degrees C/2 h + 800 degrees C/16 h and HT3: 1180 degrees C/4 h + 800 degrees C/16 h. It was found that the sub-solvus aging treatments at 1090 and 1060 degrees C precipitated sub-micron-sized ( similar to 300 nm) primary gamma ' phase which enhanced the ductility during 800 degrees C tensile (the total elongation of T1, T2, and T3 samples were 6.75 %, 7.3 %, and 3.25 %, respectively) without evidently impairing the strength. After careful microstructure observation and deformation mechanism analysis, the enhancement of elongation was rationalized that the precipitation of the sub-micron-sized primary gamma ' phase decreased the volume-fraction and size of the nanometer-sized gamma ' phase which was precipitated at 800 degrees C, and simultaneously, promoted the dislocation movement by suppressing the non-planar slip. However, an excessive amount of the sub-micron-sized primary gamma ' phase led to a faster ripening process of the nanometer-sized gamma ' during creep, which decreased the creep life at 800 degrees C/430 MPa (T1: 125 h, T2: 199 h, and T3: 198 h). Based on this, we monitored the number density of nanometer-sized gamma ' phase coexisting with different amounts of large gamma ' during creep. An area fraction less than 7 % of the sub-micron-sized gamma ' phase was considered to have little detrimental effect on the creep life of K4800 alloy, which corresponded to a sub-solvus temperature range about 1080-1090 degrees C. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Nickel-base superalloy Heat treatment Mechanical property Precipitation strengthening Deformation mechanism
DOI	10.1016/j.jmst.2024.06.014
收录类别	SCI
语种	英语
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001267950700001
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/187961
专题	中国科学院金属研究所
通讯作者	Wang, Min; Ma, Ying-Che
作者单位	1.Chinese Acad Sci, Inst Met Res, Shi changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.IMR NMSA, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Peng-Fei,Hou, Kun-Lei,Wang, Min,et al. Effects of sub-solvus ageing on the tensile and creep properties of a new cast nickel-based superalloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2025,212:289-302.
APA	Zhao, Peng-Fei,Hou, Kun-Lei,Wang, Min,Ou, Mei-Qiong,Yang, Ya-qian,&Ma, Ying-Che.(2025).Effects of sub-solvus ageing on the tensile and creep properties of a new cast nickel-based superalloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,212,289-302.
MLA	Zhao, Peng-Fei,et al."Effects of sub-solvus ageing on the tensile and creep properties of a new cast nickel-based superalloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 212(2025):289-302.