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Microstructural Evolution and Mechanical Properties of Ultrafine-Grained Ferritic-Martensitic Steel During Thermal Aging
Chen, Shenghu; Jin, Xiaojie; Rong, Lijian
2020-10-01
Source PublicationMETALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume51Issue:10Pages:5154-5168
AbstractMicrostructural evolution and mechanical properties of ultrafine-grained 9Cr2WVTa ferritic-martensitic steelviaisothermal aging at 823 K to 923 K was studied. Fine dispersed carbides with a low coarsening rate could effectively impede migration of grain boundariesviathe Zener pinning effect in the ultrafine-grained 9Cr2WVTa during thermal aging at 823 K, which is responsible for the good microstructural stability. Higher strength and higher ductility are present in the ultrafine-grained 9Cr2WVTa than those of tempered 9Cr2WVTa after thermal aging at 823 K up to 5000 hours. Laves phase precipitating adjacent to carbides at subgrain/grain boundaries grow into fine rod-like shape along grain boundaries in ultrafine-grained 9Cr2WVTa, while granular-like Laves phase is resulted in tempered 9Cr2WVTa. Newly formed nanometer-size Laves phase could provide precipitation strengthening to compensate loss of solid solution hardening, and relatively homogenous precipitation of Laves phase could considerably suppress microcrack formation in ultrafine-grained 9Cr2WVTa. However, abnormal grain growth is induced by the non-uniformity of pinning efficiency in the ultrafine-grained 9Cr2WVTa during thermal aging at 923 K. The abnormal grain growth leads to a significant reduction in the strengthening effect from subgrain hardening, which is more than three times larger than the Orowan stress from particle hardening, thus a dramatic decrease in the micro-hardness is resulted.
DOI10.1007/s11661-020-05939-2
WOS IDWOS:000557124200001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/155682
Collection中国科学院金属研究所
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GB/T 7714
Chen, Shenghu,Jin, Xiaojie,Rong, Lijian. Microstructural Evolution and Mechanical Properties of Ultrafine-Grained Ferritic-Martensitic Steel During Thermal Aging[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2020,51(10):5154-5168.
APA Chen, Shenghu,Jin, Xiaojie,&Rong, Lijian.(2020).Microstructural Evolution and Mechanical Properties of Ultrafine-Grained Ferritic-Martensitic Steel During Thermal Aging.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,51(10),5154-5168.
MLA Chen, Shenghu,et al."Microstructural Evolution and Mechanical Properties of Ultrafine-Grained Ferritic-Martensitic Steel During Thermal Aging".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 51.10(2020):5154-5168.
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