Microstructure and mechanical properties of adjustable-ring-mode laser welded and hot-stamped Al–Si coated boron steel joints
The microstructure and mechanical properties of adjustable-ring-mode (ARM) laser-welded, hot-stamped 22MnB5 steel joints were analyzed and compared with those of Al–Si coated 22MnB5. Al segregation into the fusion zone (FZ) was suppressed by a ring beam introduced via ring-beam-mode (RBM) and dual-b...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S223878542303082X |
| _version_ | 1827368326660096000 |
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| author | Hyun-Uk Jun Jae-Deuk Kim Jooyong Cheon Jaehun Kim Yeong-Do Park Yang-Do Kim Changwook Ji |
| author_facet | Hyun-Uk Jun Jae-Deuk Kim Jooyong Cheon Jaehun Kim Yeong-Do Park Yang-Do Kim Changwook Ji |
| author_sort | Hyun-Uk Jun |
| collection | DOAJ |
| description | The microstructure and mechanical properties of adjustable-ring-mode (ARM) laser-welded, hot-stamped 22MnB5 steel joints were analyzed and compared with those of Al–Si coated 22MnB5. Al segregation into the fusion zone (FZ) was suppressed by a ring beam introduced via ring-beam-mode (RBM) and dual-beam-mode (DBM) laser welding. Dilution of the Al–Si coating in the FZ induced α-ferrite formation during hot stamping. After hot stamping, the α-ferrite fraction in the FZ decreased (from 23 vol% to 4.27 vol%) more than that in the center-beam-mode (CBM) welded joints owing to the ring beam. Electron backscattered diffraction analysis indicated the distribution of high-density and uniform geometrically necessary dislocations, which caused coordinated deformation in the martensite grains, in the RBM and DBM FZs. The average microhardness in the FZ in the tailor-welded blank (TWB) joints was ∼30–40 HV lower than that in the RBM and DBM welded base metal (480 HV) and that in the FZ of the CBM reduced to 295 HV because of the formation of a large amount of ductile α-ferrite. The tensile strength and elongation of the TWB joint in the CBM were ∼989 MPa and 1.1 %, respectively, which were significantly lower than those of the RBM (1245 MPa and 1.96 %, respectively) and DBM (1321 MPa and 2.12 %, respectively). Finally, the 22MnB5 steel sheets were subjected to ARM laser welding without removing the coating layer to evaluate the effect of the ring beam on Al segregation suppression in the FZ and mechanical properties of the TWB joints. |
| first_indexed | 2024-03-08T09:28:38Z |
| format | Article |
| id | doaj.art-2bb14c91cf204db2a3d244f910709eee |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-08T09:28:38Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-2bb14c91cf204db2a3d244f910709eee2024-01-31T05:43:18ZengElsevierJournal of Materials Research and Technology2238-78542024-01-0128844855Microstructure and mechanical properties of adjustable-ring-mode laser welded and hot-stamped Al–Si coated boron steel jointsHyun-Uk Jun0Jae-Deuk Kim1Jooyong Cheon2Jaehun Kim3Yeong-Do Park4Yang-Do Kim5Changwook Ji6Department of Materials Science and Engineering, Pusan National University, Busan, 46241, Republic of Korea; Advanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan, 44413, Republic of KoreaDepartment of Materials Science and Engineering, Pusan National University, Busan, 46241, Republic of Korea; Advanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan, 44413, Republic of KoreaAdvanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan, 44413, Republic of KoreaAdvanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan, 44413, Republic of KoreaDepartment of Advanced Materials Engineering, Dong-Eui University, Busan, 47227, Republic of KoreaDepartment of Materials Science and Engineering, Pusan National University, Busan, 46241, Republic of Korea; Co-corresponding author.Advanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan, 44413, Republic of Korea; Corresponding author.The microstructure and mechanical properties of adjustable-ring-mode (ARM) laser-welded, hot-stamped 22MnB5 steel joints were analyzed and compared with those of Al–Si coated 22MnB5. Al segregation into the fusion zone (FZ) was suppressed by a ring beam introduced via ring-beam-mode (RBM) and dual-beam-mode (DBM) laser welding. Dilution of the Al–Si coating in the FZ induced α-ferrite formation during hot stamping. After hot stamping, the α-ferrite fraction in the FZ decreased (from 23 vol% to 4.27 vol%) more than that in the center-beam-mode (CBM) welded joints owing to the ring beam. Electron backscattered diffraction analysis indicated the distribution of high-density and uniform geometrically necessary dislocations, which caused coordinated deformation in the martensite grains, in the RBM and DBM FZs. The average microhardness in the FZ in the tailor-welded blank (TWB) joints was ∼30–40 HV lower than that in the RBM and DBM welded base metal (480 HV) and that in the FZ of the CBM reduced to 295 HV because of the formation of a large amount of ductile α-ferrite. The tensile strength and elongation of the TWB joint in the CBM were ∼989 MPa and 1.1 %, respectively, which were significantly lower than those of the RBM (1245 MPa and 1.96 %, respectively) and DBM (1321 MPa and 2.12 %, respectively). Finally, the 22MnB5 steel sheets were subjected to ARM laser welding without removing the coating layer to evaluate the effect of the ring beam on Al segregation suppression in the FZ and mechanical properties of the TWB joints.http://www.sciencedirect.com/science/article/pii/S223878542303082XARM laserHot-stampedAl–Si coatedMicrostructureMechanical propertiesRing beam |
| spellingShingle | Hyun-Uk Jun Jae-Deuk Kim Jooyong Cheon Jaehun Kim Yeong-Do Park Yang-Do Kim Changwook Ji Microstructure and mechanical properties of adjustable-ring-mode laser welded and hot-stamped Al–Si coated boron steel joints Journal of Materials Research and Technology ARM laser Hot-stamped Al–Si coated Microstructure Mechanical properties Ring beam |
| title | Microstructure and mechanical properties of adjustable-ring-mode laser welded and hot-stamped Al–Si coated boron steel joints |
| title_full | Microstructure and mechanical properties of adjustable-ring-mode laser welded and hot-stamped Al–Si coated boron steel joints |
| title_fullStr | Microstructure and mechanical properties of adjustable-ring-mode laser welded and hot-stamped Al–Si coated boron steel joints |
| title_full_unstemmed | Microstructure and mechanical properties of adjustable-ring-mode laser welded and hot-stamped Al–Si coated boron steel joints |
| title_short | Microstructure and mechanical properties of adjustable-ring-mode laser welded and hot-stamped Al–Si coated boron steel joints |
| title_sort | microstructure and mechanical properties of adjustable ring mode laser welded and hot stamped al si coated boron steel joints |
| topic | ARM laser Hot-stamped Al–Si coated Microstructure Mechanical properties Ring beam |
| url | http://www.sciencedirect.com/science/article/pii/S223878542303082X |
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