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A novel large cross-section quenching and tempering mold steel matching excellent strength-hardness-toughness properties
Liu, Hanghang1,2; Fu, Paixian1,2; Liu, Hongwei1,2; Sun, Chen1,2; Sun, Mingyue1,2; Li, Dianzhong1,2
Corresponding AuthorFu, Paixian(pxfu@imr.ac.cn) ; Li, Dianzhong(dzli@imr.ac.cn)
2018-11-08
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume737Pages:274-285
AbstractAccording to the synergistic effect of multiple elements, a novel large cross-section pre-hardened mold steel is designed with higher strength and hardness as well as toughness (HSTPM steel) compared with industrial high-end 718H steel during the normal tempering temperature range (530-650 degrees C). The achievements on the strength and hardness of HSTPM steel are attributed to the effects of 0.5 wt% molybdenum (Mo) and 0.1 wt% vanadium (V) additions on the matrix structure, including misorientation gradient, dislocation density, and nano-sized precipitates. The main strengthening precipitate (V, Mo)C was finely characterized by high angle annular dark field-scanning transmission electron microscope (HADDF-STEM) analysis. In addition, it was found that rare earth (RE) additions of 0.015 wt% in HSTPM steel highly effective in refining inclusions for changing the morphologies of strip MnS and Al2O3 to tiny spherical RE2O2S, and the number of coarse inclusions (diameter exceeding 5 mu m) is significantly decreased in the same statistical volume (4.69 x 10(8) mu m(3)) by three-dimensional X-ray microtomography statistical technique. The purification of molten steel and modification of inclusions by RE treatment are responsible for the improvement of impact toughness. Simultaneously, the lower carbon (C) content in HSTPM steel (high-end 718 H, 0.34 wt%; HSTPM, 0.23 wt%) also plays a large role in improving impact toughness. Finally, the synergistic effect of multiple elements delayed and eventually reduced the transformation range in pearlite compared with that in 718H steel.
KeywordA novel pre-hardened mold steel Strength-hardness-toughness Lower carbon content Rare earth Micro-alloying
Funding OrganizationNational Key Research and Development Program of China ; Cooperation Program of Hubei Province ; Chinese Academy of Sciences (The Research and Development of Key Technologies for Special Steel of Homogeneous High Performance)
DOI10.1016/j.msea.2018.09.046
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFB0300401] ; Cooperation Program of Hubei Province ; Chinese Academy of Sciences (The Research and Development of Key Technologies for Special Steel of Homogeneous High Performance)
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000448493600032
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/130060
Collection中国科学院金属研究所
Corresponding AuthorFu, Paixian; Li, Dianzhong
Affiliation1.Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Liu, Hanghang,Fu, Paixian,Liu, Hongwei,et al. A novel large cross-section quenching and tempering mold steel matching excellent strength-hardness-toughness properties[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,737:274-285.
APA Liu, Hanghang,Fu, Paixian,Liu, Hongwei,Sun, Chen,Sun, Mingyue,&Li, Dianzhong.(2018).A novel large cross-section quenching and tempering mold steel matching excellent strength-hardness-toughness properties.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,737,274-285.
MLA Liu, Hanghang,et al."A novel large cross-section quenching and tempering mold steel matching excellent strength-hardness-toughness properties".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 737(2018):274-285.
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