Microstructure, thermal stability and tensile properties of a Ni-Fe-Cr based superalloy with different Fe contents

doi:10.1016/j.intermet.2022.107785

IMR OpenIR

	Microstructure, thermal stability and tensile properties of a Ni-Fe-Cr based superalloy with different Fe contents
	Cheng, Sihan 1,2; Wang, Jiaqi 1,2; Wu, Yunsheng 1,3; Qin, Xuezhi 1,3; Zhou, Lanzhang 1,3
通讯作者	Qin, Xuezhi(xzqin@imr.ac.cn) ; Zhou, Lanzhang(lzzhou@imr.ac.cn)
	2023-02-01
发表期刊	INTERMETALLICS
ISSN	0966-9795
卷号	153 页码:12
摘要	The effects of Fe content on microstructure, thermal stability and tensile properties of a Ni-Fe-Cr based su-peralloy, mainly chosen as turbine rotor material in 700 degrees C advanced ultra-supercritical power plants, have been systematically investigated. The results show that the major precipitates of the heat-treated alloys with different Fe contents are all gamma ' phase, MC and M23C6 carbides, whereas the precipitation of gamma ' phase is suppressed in Fe-rich alloys. Fe content significantly improves the ductility of alloys, but slightly deteriorates the strength resulting from the decreased volume fraction of gamma ' phase. After long-term thermal exposure, the morphology trans-formation of gamma ' phase from spherical to cubic shape is observed in the alloy with 35% Fe content. The coarsening rate coefficient of gamma ' phase decreases from 485.7 nm3/h to 280.8 nm3/h as increasing Fe content from 15% to 35%. The main reason is that there is a large concentration gradient of Fe element in the vicinity of gamma/gamma ' interface, which obviously restricts Fe atoms from diffusing away. The change of yield strength with particle size can be explained by the strongly coupled dislocation shearing and Orowan bowing models. When Fe content is up to 35%, the yield strength of the alloy reduces more rapidly than the theoretical value due to the precipitation of harmful Laves phase in the intermediate stage of thermal exposure.
关键词	Ni-Fe-Cr based superalloy Fe content Microstructure Thermal exposure Tensile behavior
资助者	National Natural Science Foundation of China
DOI	10.1016/j.intermet.2022.107785
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China ; [51871213]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000899525700001
出版者	ELSEVIER SCI LTD
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/321006/175952
专题	中国科学院金属研究所
通讯作者	Qin, Xuezhi; Zhou, Lanzhang
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.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Cheng, Sihan,Wang, Jiaqi,Wu, Yunsheng,et al. Microstructure, thermal stability and tensile properties of a Ni-Fe-Cr based superalloy with different Fe contents[J]. INTERMETALLICS,2023,153:12.
APA	Cheng, Sihan,Wang, Jiaqi,Wu, Yunsheng,Qin, Xuezhi,&Zhou, Lanzhang.(2023).Microstructure, thermal stability and tensile properties of a Ni-Fe-Cr based superalloy with different Fe contents.INTERMETALLICS,153,12.
MLA	Cheng, Sihan,et al."Microstructure, thermal stability and tensile properties of a Ni-Fe-Cr based superalloy with different Fe contents".INTERMETALLICS 153(2023):12.