| Limitations of the homogenization process of bulk martensitic mold steel-depending on the comprehensive manifestation of various strengthening | |
| Liu, Hanghang1,3; Fu, Paixian1,3; Liu, Hongwei1,3; Sun, Chen1,3; Du, Ningyu1,2,3; Li, Dianzhong1,3 | |
| Corresponding Author | Fu, Paixian(pxfu@imr.ac.cn) ; Li, Dianzhong(dzli@imr.ac.cn) |
| 2022-08-01 | |
| Source Publication | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| ISSN | 1005-0302 |
| Volume | 117Pages:120-132 |
| Abstract | 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. |
| Keyword | Martensitic mold steel Strength-toughness Micro-segregation Synergistic strengthening |
| Funding Organization | 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 |
| DOI | 10.1016/j.jmst.2021.10.046 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000788178100004 |
| Publisher | JOURNAL MATER SCI TECHNOL |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/172531 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Fu, Paixian; Li, Dianzhong |
| Affiliation | 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 |
| Recommended Citation 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. |
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