Microstructural Evolution and Mechanical Properties of Ultrafine-Grained Ferritic-Martensitic Steel During Thermal Aging

被引:8
作者
Chen, Shenghu [1 ]
Jin, Xiaojie [2 ]
Rong, Lijian [1 ]
机构
[1] Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, 72 Wenhua Rd, Shenyang 110016, Peoples R China
[2] Chinalco Mat Applicat Res Inst Co Ltd, Suzhou Branch, Suzhou 215026, Peoples R China
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2020年 / 51卷 / 10期
基金
中国国家自然科学基金;
关键词
CREEP DEFORMATION-BEHAVIOR; HEAT-RESISTANT STEELS; FE2W LAVES PHASE; LONG-TERM CREEP; FERRITIC/MARTENSITIC STEELS; STRENGTHENING MECHANISMS; CHROMIUM STEEL; PRECIPITATION; GROWTH; IMPROVEMENT;
D O I
10.1007/s11661-020-05939-2
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页码:5154 / 5168
页数:15
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