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Effect of vanadium micro-alloying on the microstructure evolution and mechanical properties of 718H pre-hardened mold steel
Liu, Hanghang; Fu, Paixian; Liu, Hongwei; Sun, Chen; Du, Ningyu; Li, Dianzhong
2019-11-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume35Issue:11Pages:2526-2536
AbstractThe effects of different contents of vanadium (V) (0.1, 0.2, and 0.3 wt%) on the microstructure evolution and mechanical properties of 718H steel were investigated. The precipitate was characterized by means of atom probe tomography (APT) and bright-field transmission electron microscopy (TEM). The increase in V content has great benefits for strength, but has an adverse effect on impact toughness. The strength increase can be attributed to the influence of V addition on dislocation density, misorientation gradient, and fine scale MC precipitates. Precipitation strengthening mainly contributes to the V-added steel by analyzing various strengthening mechanisms. However, fine scale MC precipitates can pin dislocation leading to a decrease in its mobility. A large number of immovable dislocations will increase the dislocation accumulation, internal stress and brittle cracking, resulting in a gradual decrease in impact toughness with the V addition. In addition, compared with V-free steel, the dissolved V content in austenite decreases the grain boundary energy and inhibits the diffusion of the C atoms, ultimately reducing the transformation range of pearlite (P). (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
Keyword718H steel Vanadium Microstructure Mechanical properties
Indexed BySCI
Language英语
WOS IDWOS:000497965900012
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80651
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Liu, Hanghang,Fu, Paixian,Liu, Hongwei,et al. Effect of vanadium micro-alloying on the microstructure evolution and mechanical properties of 718H pre-hardened mold steel[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2019,35(11):2526-2536.
APA Liu, Hanghang,Fu, Paixian,Liu, Hongwei,Sun, Chen,Du, Ningyu,&Li, Dianzhong.(2019).Effect of vanadium micro-alloying on the microstructure evolution and mechanical properties of 718H pre-hardened mold steel.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,35(11),2526-2536.
MLA Liu, Hanghang,et al."Effect of vanadium micro-alloying on the microstructure evolution and mechanical properties of 718H pre-hardened mold steel".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 35.11(2019):2526-2536.
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