A novel large cross-section quenching and tempering mold steel matching excellent strength-hardness-toughness properties

doi:10.1016/j.msea.2018.09.046

CORC > 金属研究所 > 中国科学院金属研究所

	A novel large cross-section quenching and tempering mold steel matching excellent strength-hardness-toughness properties
	Liu, HH ; Fu, PX ; Liu, HW ; Sun, C 1; Sun, MY ; Li, DZ
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2018-11-08
卷号	737 页码:274-285
关键词	A novel pre-hardened mold steel Strength-hardness-toughness Lower carbon content Rare earth Micro-alloying
ISSN号	0921-5093
DOI	10.1016/j.msea.2018.09.046
英文摘要	According 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.
学科主题	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000448493600032
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79830]
专题	金属研究所_中国科学院金属研究所
作者单位	1.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
推荐引用方式 GB/T 7714	Liu, HH,Fu, PX,Liu, HW,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, HH,Fu, PX,Liu, HW,Sun, C,Sun, MY,&Li, DZ.(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, HH,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.