Abnormal improvement of high-temperature stress rupture life in a new low cost Ni-based single crystal superalloy by adding minor nitrogen

doi:10.1016/j.msea.2023.144980

IMR OpenIR

	Abnormal improvement of high-temperature stress rupture life in a new low cost Ni-based single crystal superalloy by adding minor nitrogen
	Tao, Xipeng 1; Wang, Xinguang 1,2; Meng, Jie 1; Zhou, Yizhou 1,2; Li, Jinguo 1; Sun, Xiaofeng 1
通讯作者	Wang, Xinguang(xgwang11b@imr.ac.cn) ; Zhou, Yizhou(yzzhou@imr.ac.cn)
	2023-05-08
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	872 页码:13
摘要	Generally, elevated nitrogen (N) content promotes the precipitation of nitrides, which increase the size and quantity of porosity and thus degrade the mechanical performance of superalloys. However, in this study, N content was found to have a beneficial impact on the stress rupture property of single-crystal (SX) superalloys. The results indicated that as the N content increased from 5 ppm to 35 ppm, the porosity first decreased and then increased. The porosity of the sample with 14 ppm N was the lowest, 0.072% +/- 0.011%, which was mainly attributed to the TiN phases in interdendritic pools that compensated for volume shrinkage by lattice expansion. The addition of N reduced the volume fraction and antiphase boundary energy of the gamma ' phase because TiN nitride formation consumed Ti in large quantities. Additionally, the rupture life at 1100 degrees C/130 MPa was abnormally improved to 251.67 h +/- 19 h as the N content was increased to 14 ppm, while it was markedly decreased as the N content was continuously increased to 35 ppm. The improved stress fracture life of the alloy was primarily attributed to the formation of TiN with a small size, which retarded microporosity formation and effectively impeded dislocation movement in gamma channels. Moreover, during the stress rupture test, the size of the tertiary gamma ' phase first reduced to a minimum in the alloy containing 14 ppm N, which increased the resistance to dislocation movement. However, excessive addition of N drastically reduced the stress fracture life as the precipitation and solid solution strengthening in the gamma ' phase weakened. In addition, the agglomeration of nitride inclusions formed defects that aggravated crack nucleation and propagation. The overall N impact was studied, and the optimal N content was ascertained to provide further instructions for the commercial development of Re-free secondgeneration SX alloys.
关键词	Nitrogen content High temperature Microstructure Stress rupture property Single crystal superalloy
资助者	National Key R&D Program of China ; National Science and Technology Major Project ; Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
DOI	10.1016/j.msea.2023.144980
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2017YFA0700704] ; National Science and Technology Major Project ; Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences[2017-VI-0002-0072] ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; [CXYJJ20-MS-03]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001004065500001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：3[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/321006/178241
专题	中国科学院金属研究所
通讯作者	Wang, Xinguang; Zhou, Yizhou
作者单位	1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Tao, Xipeng,Wang, Xinguang,Meng, Jie,et al. Abnormal improvement of high-temperature stress rupture life in a new low cost Ni-based single crystal superalloy by adding minor nitrogen[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2023,872:13.
APA	Tao, Xipeng,Wang, Xinguang,Meng, Jie,Zhou, Yizhou,Li, Jinguo,&Sun, Xiaofeng.(2023).Abnormal improvement of high-temperature stress rupture life in a new low cost Ni-based single crystal superalloy by adding minor nitrogen.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,872,13.
MLA	Tao, Xipeng,et al."Abnormal improvement of high-temperature stress rupture life in a new low cost Ni-based single crystal superalloy by adding minor nitrogen".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 872(2023):13.