Microstructure and Impact Toughness of Welding Heat-Affected Zones of a Fe-Cr-Ni-Mo High Strength Steel
文献类型：期刊论文
| 作者 | Wen Mingyue2,3; Dong Wenchao3; Pang Huiyong1; Lu Shanping3 |
| 刊名 | ACTA METALLURGICA SINICA
 |
| 出版日期 | 2018-04-01 |
| 卷号 | 54期号:4页码:501-511 |
| 关键词 | Fe-Cr-Ni-Mo high strength steel welding heat affected zone impact toughness microstructure |
| ISSN号 | 0412-1961 |
| DOI | 10.11900/0412.1961.2017.00331 |
| 通讯作者 | Lu Shanping(shplu@imr.ac.cn) |
| 英文摘要 | Marine engineering steel is the key material for the construction of major marine infrastructure projects. Due to the harsh environment in the deep sea, the mechanical properties such as strength, low temperature toughness and so on of the marine steel are required to be higher. In this work, the weldability of a Fe-Cr-Ni-Mo high-strength steel was studied, and the microstructure and impact toughness of the steel after welding thermal cycling at different peak temperatures were analyzed. The results show that the average impact toughness of characteristic heat affected zone under different temperatures increases first and then decreases with the increase of peak temperature (T-p). The microstructures of coarse grain heat-affected zone (CGHAZ, T-P=1320 degrees C) and fine grain heat-affected zone (FGHAZ, T-p= 1020 degrees C) are quenched martensite. Because of the coarse grain size, the impact toughness of CGHAZ is poor, which is lower than that of FGHAZ. The microstructure of inter-critical heat-affected zone (ICHAZ, T-p =830 degrees C and T-p =760 degrees C) is composed of quenched martensite and tempered martensite. Due to the randomness of the proportion of the interfaces between the mixed microstructures near the V-notch, the impact energy values of ICHAZ fluctuates greatly. The homogeneous fine grain structure in ICHAZ (T-p= 830 degrees C) has a crack arrest effect during the impact deformation, which makes the characteristic zone have the best impact toughness. Although the grain size in ICHAZ (T-P=760 degrees C) is also fine, the existence of the ultra-fine grain zones (the grain size in which is only 1 similar to 2 mu m) benefits the formation of secondary voids under the impact load. The undissolved M2C and MC precipitations in matrix promote the connecting of secondary voids and then form the secondary cracks. As a result, the impact toughness of the characteristic zone is poor, and becomes the weak region of HAZ. |
| 资助项目 | National Key Research and Development Program of China[2016YFB0300601] ; Key Programs of Chinese Academy of Sciences[GFZD-125-15-003-1] |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000433006500003 |
| 出版者 | SCIENCE PRESS |
| 资助机构 | National Key Research and Development Program of China ; Key Programs of Chinese Academy of Sciences |
| 源URL | [http://ir.imr.ac.cn/handle/321006/128518]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Lu Shanping |
| 作者单位 | 1.Wuyang Iron & Steel Co Ltd, Pingdingshan 462500, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wen Mingyue,Dong Wenchao,Pang Huiyong,et al. Microstructure and Impact Toughness of Welding Heat-Affected Zones of a Fe-Cr-Ni-Mo High Strength Steel[J]. ACTA METALLURGICA SINICA,2018,54(4):501-511. |
| APA | Wen Mingyue,Dong Wenchao,Pang Huiyong,&Lu Shanping.(2018).Microstructure and Impact Toughness of Welding Heat-Affected Zones of a Fe-Cr-Ni-Mo High Strength Steel.ACTA METALLURGICA SINICA,54(4),501-511. |
| MLA | Wen Mingyue,et al."Microstructure and Impact Toughness of Welding Heat-Affected Zones of a Fe-Cr-Ni-Mo High Strength Steel".ACTA METALLURGICA SINICA 54.4(2018):501-511. |
入库方式： OAI收割
来源：金属研究所
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