Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents

doi:10.1016/j.jmst.2018.10.017

IMR OpenIR

	Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents
	Zhang, Xu 1,2,3; Li, Dianzhong 3; Li, Yiyi 3; Lu, Shanping 3
通讯作者	Lu, Shanping(shplu@imr.ac.cn)
	2019-04-01
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	35 期号:4 页码:520-529
摘要	The microstructure evolutions and the mechanical properties of the 25Cr-20Ni austenitic stainless steel weld metals with different Nb contents were investigated during the long term aging treatment at 700 degrees C. M23C6 Nb(C, N),alpha-Cr phase and Nb-nitride phase (Z phase) were observed in the microstructures of the aged weld metals. The results showed that the alpha-Cr phase precipitated in the interdendritic regions of the weld metals after being exposed to 700 degrees C for 500 h and the element Nb accelerated the precipitation of the alpha-Cr phase significantly. The density of the alpha-Cr phase decreased with the increase of the distance away from the primary Nb(C, N). Additionally, the alpha-Cr phase showed a crystallographic relationship with the austenitic matrix, [1 (1) over bar(1) over bar] (alpha-Cr) // [1 (1) over bar0](gamma) and (01 (1) over bar)(alpha-Cr) // ((1) over bar(1) over bar1)(gamma). It was observed that the Z phase precipitated in the periphery of the Nb(C, N) and may replace the Nb(C, N) after long term exposure to high temperature. The transformation of the Nb(C, N) into Z phase suggested that the Z phase had a higher stability than the Nb(C, N) particles at 700 degrees C for long term aging. The tensile strength of the Nb-bearing weld metal showed a continuous decrease at the initial stage of the aging treatment and then went up slightly with the prolonged aging time. However, the elongations and the impact energies of the weld metals decreased monotonously with the increase of the aging time. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	25Cr-20Ni steel Weld metal Nb Aging treatment alpha-Cr phase Mechanical property
资助者	research and development of nuclear materials and service safety assurance technology ; National Natural Science Foundation of China (NSFC)
DOI	10.1016/j.jmst.2018.10.017
收录类别	SCI
语种	英语
资助项目	research and development of nuclear materials and service safety assurance technology[ZDRW-CN-2017-1] ; National Natural Science Foundation of China (NSFC)[51474203]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000455967200008
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：33[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/321006/131274
专题	中国科学院金属研究所
通讯作者	Lu, Shanping
作者单位	1.Chinese Acad Sci, Key Lab Nucl Mat & Safety Assessment, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xu,Li, Dianzhong,Li, Yiyi,et al. Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2019,35(4):520-529.
APA	Zhang, Xu,Li, Dianzhong,Li, Yiyi,&Lu, Shanping.(2019).Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,35(4),520-529.
MLA	Zhang, Xu,et al."Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 35.4(2019):520-529.