| Microstructural Evolution and Mechanical Properties of Ultrafine-Grained Ferritic-Martensitic Steel During Thermal Aging | |
| Chen, Shenghu; Jin, Xiaojie; Rong, Lijian | |
| 2020-10-01 | |
| Source Publication | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
 |
| Volume | 51Issue:10Pages:5154-5168 |
| Abstract | Microstructural 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. |
| DOI | 10.1007/s11661-020-05939-2 |
| WOS ID | WOS:000557124200001 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/155682 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation 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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