The Decomposition Characteristics and Carbide Growth Mechanism of T91 Heat-Resistant Steel After Long-Term Creep at 650 °C

doi:10.1007/s11665-025-10699-4

IMR OpenIR

	The Decomposition Characteristics and Carbide Growth Mechanism of T91 Heat-Resistant Steel After Long-Term Creep at 650 °C
	Zhang, Zhen 1,2; Zhang, Bin 3; Qu, Kejie 1; Tu, Yekuan 1; Xu, Zixuan 1; Han, Yujun 1,2; Zhang, Baosen 1,2; Shen, Yong 4; Hu, Zhengfei 3
通讯作者	Zhang, Zhen(zhangzhen@njit.edu.cn) ; Shen, Yong(yongshen@imr.ac.cn) ; Hu, Zhengfei(huzhengf@tongji.edu.cn)
	2025-02-18
发表期刊	JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
ISSN	1059-9495
页码	13
摘要	To elucidate the cause of decomposition in martensite laths of T91 heat-resistant steel (T91 HRS) during long-term creep at 650 degrees C, the microstructure of the steel after creep at 650 degrees C lasting up to 12343 h was investigated. X-ray diffraction (XRD) results show that the crystal lattice constant of the matrix alpha Fe declines after long-term creep. The hardness and average geometrically necessary dislocation (GND) density first increases slightly at the initial stage of creep and then decreases. The formation of polygonized subgrain occurs after long-term creep as systematically verified by transmission electron microscopy (TEM) image and electron backscattered diffraction (EBSD) mapping analysis. TEM and energy-dispersive spectrum (EDS) analysis reveal that the rodlike M23C6 carbides containing more silicon elements exhibit accelerated coarsening behavior. The fraction of chromium increases, the fraction of iron decreases, and the fraction of molybdenum remains relatively stable in M23C6 carbides after long-term creep at 650 degrees C. Back-scatter electron (BSE) analysis shows that the coarsening rate of carbides varies at different locations due to the different diffusion rates of alloy elements at grain boundaries and lath boundaries.
关键词	carbide creep damage decomposition martensite lath T91HRS
资助者	National Natural Science Foundation of China ; Open Fund of Jiangsu Wind Power Engineering Technology Center ; Jiangsu Key Research and Development Program of China ; Jiangsu Province Postgraduate Practice and Innovation Program Project
DOI	10.1007/s11665-025-10699-4
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51971163] ; Open Fund of Jiangsu Wind Power Engineering Technology Center[ZK22-03-02] ; Jiangsu Key Research and Development Program of China[BE2021020] ; Jiangsu Province Postgraduate Practice and Innovation Program Project[SJCX24_1298]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:001424299100001
出版者	SPRINGER
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/180047
专题	中国科学院金属研究所
通讯作者	Zhang, Zhen; Shen, Yong; Hu, Zhengfei
作者单位	1.Nanjing Inst Technol, Sch Mat Sci & Engn, Nanjing 211167, Jiangsu, Peoples R China 2.Jiangsu Key Lab Adv Struct Mat & Applicat Technol, Nanjing 211167, Jiangsu, Peoples R China 3.Tongji Univ, Sch Mat Sci & Engn, Shanghai 201804, Peoples R China 4.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Zhen,Zhang, Bin,Qu, Kejie,et al. The Decomposition Characteristics and Carbide Growth Mechanism of T91 Heat-Resistant Steel After Long-Term Creep at 650 °C[J]. JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE,2025:13.
APA	Zhang, Zhen.,Zhang, Bin.,Qu, Kejie.,Tu, Yekuan.,Xu, Zixuan.,...&Hu, Zhengfei.(2025).The Decomposition Characteristics and Carbide Growth Mechanism of T91 Heat-Resistant Steel After Long-Term Creep at 650 °C.JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE,13.
MLA	Zhang, Zhen,et al."The Decomposition Characteristics and Carbide Growth Mechanism of T91 Heat-Resistant Steel After Long-Term Creep at 650 °C".JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2025):13.