Limitations of the homogenization process of bulk martensitic mold steel-depending on the comprehensive manifestation of various strengthening

doi:10.1016/j.jmst.2021.10.046

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	Limitations of the homogenization process of bulk martensitic mold steel-depending on the comprehensive manifestation of various strengthening
	Liu, Hanghang 1,3; Fu, Paixian 1,3; Liu, Hongwei 1,3; Sun, Chen 1,3; Du, Ningyu 1,2,3; Li, Dianzhong 1,3
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2022-08-01
卷号	117 页码:120-132
关键词	Martensitic mold steel Strength-toughness Micro-segregation Synergistic strengthening
ISSN号	1005-0302
DOI	10.1016/j.jmst.2021.10.046
通讯作者	Fu, Paixian(pxfu@imr.ac.cn) ; Li, Dianzhong(dzli@imr.ac.cn)
英文摘要	A homogenization treatment (1250 degrees C + 12 h) was carried out to minimize the micro-segregation of bulk 718H martensitic mold steel, as verified by advanced experimental characterization and kinetic model of diffusion. However, new research found that there are still limitations in the use of the homogenization process. The result indicates that the chemical heterogeneity can be significantly reduced after homogenization. The segregation ratio of Cr and Mo elements of sample decreased by 40.9% and 35.6% of the original level, respectively. Simultaneously, the test steel with higher strength and toughness is produced by controlling micro-segregation tempered from 540 degrees C to 650 degrees C. Importantly, it reveals that the impact energy is increased by up to 27.3%. The isotropy of impact energy in different directions can reach 0.89, resulting in an overall improvement in the isotropy. Toughness mainly depends on the orientation relationship between the crack propagation direction and the band segregation region. The chain carbides formed due to the decomposition of the micro-segregated region during tempering are considered the main source of cracks. The more evenly distributed the subsequent tempered carbides after homogenization, resulting in an increase in toughness. However, an abnormal phenomenon is found in which the yield strength after homogenization is lower than that of the untreated sample tempered at 700 degrees C. This result can be attributed to the combined influences of precipitation strengthening and fine grain strengthening by analyzing various strengthening mechanisms. The mutually restrictive strengthening effect leads to the limitations of the homogenization process of bulk martensitic mold steel. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	China Postdoctoral Science Foundation[2019M661153] ; Young Talent Project by Shenyang National Laboratory for Materials Science[2020000358] ; Doctoral Research Startup Fund Guidance Program Project of Liaoning Province[2020-BS-004] ; Doctoral Research Startup Fund Guidance Program Project of Liaoning Province[TC190A4DA/35] ; Guangdong Basic and Applied Basic Research Foundation[2019A1515110886]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000788178100004
资助机构	China Postdoctoral Science Foundation ; Young Talent Project by Shenyang National Laboratory for Materials Science ; Doctoral Research Startup Fund Guidance Program Project of Liaoning Province ; Guangdong Basic and Applied Basic Research Foundation
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/172530]
专题	金属研究所_中国科学院金属研究所
通讯作者	Fu, Paixian; Li, Dianzhong
作者单位	1.Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Liu, Hanghang,Fu, Paixian,Liu, Hongwei,et al. Limitations of the homogenization process of bulk martensitic mold steel-depending on the comprehensive manifestation of various strengthening[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,117:120-132.
APA	Liu, Hanghang,Fu, Paixian,Liu, Hongwei,Sun, Chen,Du, Ningyu,&Li, Dianzhong.(2022).Limitations of the homogenization process of bulk martensitic mold steel-depending on the comprehensive manifestation of various strengthening.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,117,120-132.
MLA	Liu, Hanghang,et al."Limitations of the homogenization process of bulk martensitic mold steel-depending on the comprehensive manifestation of various strengthening".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 117(2022):120-132.