Quantitative relationship between microstructure/crystallography and strength/toughness in simulated inter-critical heat affected subzone of medium Mn steel
The objective of this study is to establish a quantitative relationship between the strengthening effects of different phases and yield strength, and also to gain a new insight into the relationship between crystallographic variants and impact toughness in the simulated inter-critical heat affected...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-01-01
|
| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422020038 |
| _version_ | 1797943036700786688 |
|---|---|
| author | Zhen Tao Chunxia Yao Cairu Gao Dongming Duan R.D.K. Misra Chao Sun Hongyan Wu Xiuhua Gao Linxiu Du |
| author_facet | Zhen Tao Chunxia Yao Cairu Gao Dongming Duan R.D.K. Misra Chao Sun Hongyan Wu Xiuhua Gao Linxiu Du |
| author_sort | Zhen Tao |
| collection | DOAJ |
| description | The objective of this study is to establish a quantitative relationship between the strengthening effects of different phases and yield strength, and also to gain a new insight into the relationship between crystallographic variants and impact toughness in the simulated inter-critical heat affected zone (ICHAZ) of 690 MPa grade thick-plate medium Mn steel. The results indicated that the heterogeneous microstructure consisted of completely tempered martensite (CTM), partly tempered martensite (PTM), fresh martensite (FM) and retained austenite (RA) was formed in ICHAZ. As the peak temperature increased from 700 to 800 °C, the relative percentage of FM significantly increased from 5.5 to 79.2 vol %, while that of RA, PTM and CTM decreased from 20.3 to 11.3 vol %, from 65.5 to 9.3 vol %, and from 8.7 to 0.2 vol %, respectively. The yield strength correspondingly increased from 800 to 1200 MPa as the peak temperature rose due to the increasing contribution of various strengthening mechanisms of distinct phases. Furthermore, impact toughness decreased paradoxically from 184.9 to 47.8 J with increasing density of high angle boundary (HAB) from 0.806 to 1.47 μm−1 and decreasing size of prior austenite grains (PAGs) from 12.5 to 4.1 μm because of the variable crack propagation path induced by different variant selection mechanisms. In concluding, this research proposed a feasible strategy to improve the welding performance of medium Mn steel. |
| first_indexed | 2024-04-10T20:17:13Z |
| format | Article |
| id | doaj.art-a9b2a440e2d742f8aab175e5849098cd |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-10T20:17:13Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-a9b2a440e2d742f8aab175e5849098cd2023-01-26T04:46:30ZengElsevierJournal of Materials Research and Technology2238-78542023-01-012230853100Quantitative relationship between microstructure/crystallography and strength/toughness in simulated inter-critical heat affected subzone of medium Mn steelZhen Tao0Chunxia Yao1Cairu Gao2Dongming Duan3R.D.K. Misra4Chao Sun5Hongyan Wu6Xiuhua Gao7Linxiu Du8The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, PR ChinaThe State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, PR ChinaThe State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, PR China; Corresponding author.Nanjing Iron & Steel Co. LTD, Nanjing, 210044, PR ChinaLaboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso500 W University Avenue El Paso, TX 79968-0521, USANanjing Iron & Steel Co. LTD, Nanjing, 210044, PR ChinaThe State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, PR ChinaThe State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, PR ChinaThe State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, PR China; Corresponding author.The objective of this study is to establish a quantitative relationship between the strengthening effects of different phases and yield strength, and also to gain a new insight into the relationship between crystallographic variants and impact toughness in the simulated inter-critical heat affected zone (ICHAZ) of 690 MPa grade thick-plate medium Mn steel. The results indicated that the heterogeneous microstructure consisted of completely tempered martensite (CTM), partly tempered martensite (PTM), fresh martensite (FM) and retained austenite (RA) was formed in ICHAZ. As the peak temperature increased from 700 to 800 °C, the relative percentage of FM significantly increased from 5.5 to 79.2 vol %, while that of RA, PTM and CTM decreased from 20.3 to 11.3 vol %, from 65.5 to 9.3 vol %, and from 8.7 to 0.2 vol %, respectively. The yield strength correspondingly increased from 800 to 1200 MPa as the peak temperature rose due to the increasing contribution of various strengthening mechanisms of distinct phases. Furthermore, impact toughness decreased paradoxically from 184.9 to 47.8 J with increasing density of high angle boundary (HAB) from 0.806 to 1.47 μm−1 and decreasing size of prior austenite grains (PAGs) from 12.5 to 4.1 μm because of the variable crack propagation path induced by different variant selection mechanisms. In concluding, this research proposed a feasible strategy to improve the welding performance of medium Mn steel.http://www.sciencedirect.com/science/article/pii/S2238785422020038Medium Mn steelICHAZMicrostructure evolutionStrengthening mechanismVariant selectionImpact toughness |
| spellingShingle | Zhen Tao Chunxia Yao Cairu Gao Dongming Duan R.D.K. Misra Chao Sun Hongyan Wu Xiuhua Gao Linxiu Du Quantitative relationship between microstructure/crystallography and strength/toughness in simulated inter-critical heat affected subzone of medium Mn steel Journal of Materials Research and Technology Medium Mn steel ICHAZ Microstructure evolution Strengthening mechanism Variant selection Impact toughness |
| title | Quantitative relationship between microstructure/crystallography and strength/toughness in simulated inter-critical heat affected subzone of medium Mn steel |
| title_full | Quantitative relationship between microstructure/crystallography and strength/toughness in simulated inter-critical heat affected subzone of medium Mn steel |
| title_fullStr | Quantitative relationship between microstructure/crystallography and strength/toughness in simulated inter-critical heat affected subzone of medium Mn steel |
| title_full_unstemmed | Quantitative relationship between microstructure/crystallography and strength/toughness in simulated inter-critical heat affected subzone of medium Mn steel |
| title_short | Quantitative relationship between microstructure/crystallography and strength/toughness in simulated inter-critical heat affected subzone of medium Mn steel |
| title_sort | quantitative relationship between microstructure crystallography and strength toughness in simulated inter critical heat affected subzone of medium mn steel |
| topic | Medium Mn steel ICHAZ Microstructure evolution Strengthening mechanism Variant selection Impact toughness |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422020038 |
| work_keys_str_mv | AT zhentao quantitativerelationshipbetweenmicrostructurecrystallographyandstrengthtoughnessinsimulatedintercriticalheataffectedsubzoneofmediummnsteel AT chunxiayao quantitativerelationshipbetweenmicrostructurecrystallographyandstrengthtoughnessinsimulatedintercriticalheataffectedsubzoneofmediummnsteel AT cairugao quantitativerelationshipbetweenmicrostructurecrystallographyandstrengthtoughnessinsimulatedintercriticalheataffectedsubzoneofmediummnsteel AT dongmingduan quantitativerelationshipbetweenmicrostructurecrystallographyandstrengthtoughnessinsimulatedintercriticalheataffectedsubzoneofmediummnsteel AT rdkmisra quantitativerelationshipbetweenmicrostructurecrystallographyandstrengthtoughnessinsimulatedintercriticalheataffectedsubzoneofmediummnsteel AT chaosun quantitativerelationshipbetweenmicrostructurecrystallographyandstrengthtoughnessinsimulatedintercriticalheataffectedsubzoneofmediummnsteel AT hongyanwu quantitativerelationshipbetweenmicrostructurecrystallographyandstrengthtoughnessinsimulatedintercriticalheataffectedsubzoneofmediummnsteel AT xiuhuagao quantitativerelationshipbetweenmicrostructurecrystallographyandstrengthtoughnessinsimulatedintercriticalheataffectedsubzoneofmediummnsteel AT linxiudu quantitativerelationshipbetweenmicrostructurecrystallographyandstrengthtoughnessinsimulatedintercriticalheataffectedsubzoneofmediummnsteel |