Effect of welding speed on the microstructure and texture development in the individual weld zone of friction stir welded DP780 steel
In this study, microstructural and texture development in the individual weld zone during friction stir welding (FSW) of DP780 steel at similar tool rotation speed (200 rpm) different welding speeds (200 mm/min and 400 mm/min) was investigated. Phase transformations and competition between recovery...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-03-01
|
| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423003605 |
| _version_ | 1797858730088333312 |
|---|---|
| author | Umer Masood Chaudry Seung-Chang Han Tea-Sung Jun |
| author_facet | Umer Masood Chaudry Seung-Chang Han Tea-Sung Jun |
| author_sort | Umer Masood Chaudry |
| collection | DOAJ |
| description | In this study, microstructural and texture development in the individual weld zone during friction stir welding (FSW) of DP780 steel at similar tool rotation speed (200 rpm) different welding speeds (200 mm/min and 400 mm/min) was investigated. Phase transformations and competition between recovery and recrystallization mechanisms in the distinct weld zones were explored by electron back scattered diffraction (EBSD). More pronounced grain refinement was observed in stir zone (SZ) of sample welded at higher speed (0.62 μm) as compared to lower welding speed (0.51 μm) which is attributed to the enhanced Zener pinning effect at higher welding speeds. Continuous dynamic recrystallization (cDRX) was found to be the dominating recrystallization mechanism in SZ of both welded samples. Orientation distribution function (ODF) based texture investigations of SZ revealed the development of D1 {1¯1¯2}<111> and D2 {112¯}<111> shear components along with the cube {001}<100> texture. The lower texture intensities witnessed in SZ of higher welding speed sample was due to the accelerated recrystallization kinetics at higher welding speeds. The microstructural investigations of thermo-mechanically affected zone (TMAZ) of both welded samples revealed that cDRX was predominant recrystallization mechanism while microshear bands, grain boundary bulging and geometric DRX (gDRX) also assisted the grain refinement. Texture analysis showed the development of D2 {112¯}<111>, J{110}<11¯2> and J¯{1¯1¯0}<1¯12¯> shear components in the TMAZ lower welding speed sample and D1 {1¯1¯2}<111>, D2 {112¯}<111>, J{110}<11¯2> and J¯{1¯1¯0}<1¯12¯> shear components in the TMAZ of higher welding speed sample. Moreover, heat affected zone (HAZ) of both samples showed higher evolution of low angle grain boundaries (LAGBs) indicating that the grains are in the dynamic recovery stage due to lower temperatures and strain. |
| first_indexed | 2024-04-09T21:18:05Z |
| format | Article |
| id | doaj.art-18c78d7dd147447ca22c9864dfddb146 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-09T21:18:05Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-18c78d7dd147447ca22c9864dfddb1462023-03-28T06:48:31ZengElsevierJournal of Materials Research and Technology2238-78542023-03-012349764989Effect of welding speed on the microstructure and texture development in the individual weld zone of friction stir welded DP780 steelUmer Masood Chaudry0Seung-Chang Han1Tea-Sung Jun2Department of Mechanical Engineering, Incheon National University, Incheon, 22012, Republic of Korea; Research Institute for Engineering and Technology, Incheon National University, Incheon, 22012, Republic of KoreaDepartment of Mechanical Engineering, Incheon National University, Incheon, 22012, Republic of KoreaDepartment of Mechanical Engineering, Incheon National University, Incheon, 22012, Republic of Korea; Research Institute for Engineering and Technology, Incheon National University, Incheon, 22012, Republic of Korea; Corresponding author.In this study, microstructural and texture development in the individual weld zone during friction stir welding (FSW) of DP780 steel at similar tool rotation speed (200 rpm) different welding speeds (200 mm/min and 400 mm/min) was investigated. Phase transformations and competition between recovery and recrystallization mechanisms in the distinct weld zones were explored by electron back scattered diffraction (EBSD). More pronounced grain refinement was observed in stir zone (SZ) of sample welded at higher speed (0.62 μm) as compared to lower welding speed (0.51 μm) which is attributed to the enhanced Zener pinning effect at higher welding speeds. Continuous dynamic recrystallization (cDRX) was found to be the dominating recrystallization mechanism in SZ of both welded samples. Orientation distribution function (ODF) based texture investigations of SZ revealed the development of D1 {1¯1¯2}<111> and D2 {112¯}<111> shear components along with the cube {001}<100> texture. The lower texture intensities witnessed in SZ of higher welding speed sample was due to the accelerated recrystallization kinetics at higher welding speeds. The microstructural investigations of thermo-mechanically affected zone (TMAZ) of both welded samples revealed that cDRX was predominant recrystallization mechanism while microshear bands, grain boundary bulging and geometric DRX (gDRX) also assisted the grain refinement. Texture analysis showed the development of D2 {112¯}<111>, J{110}<11¯2> and J¯{1¯1¯0}<1¯12¯> shear components in the TMAZ lower welding speed sample and D1 {1¯1¯2}<111>, D2 {112¯}<111>, J{110}<11¯2> and J¯{1¯1¯0}<1¯12¯> shear components in the TMAZ of higher welding speed sample. Moreover, heat affected zone (HAZ) of both samples showed higher evolution of low angle grain boundaries (LAGBs) indicating that the grains are in the dynamic recovery stage due to lower temperatures and strain.http://www.sciencedirect.com/science/article/pii/S2238785423003605DP steelFriction stir welding (FSW)Dynamic recrystallization (DRX)Electron back scattered diffraction (EBSD)Texture |
| spellingShingle | Umer Masood Chaudry Seung-Chang Han Tea-Sung Jun Effect of welding speed on the microstructure and texture development in the individual weld zone of friction stir welded DP780 steel Journal of Materials Research and Technology DP steel Friction stir welding (FSW) Dynamic recrystallization (DRX) Electron back scattered diffraction (EBSD) Texture |
| title | Effect of welding speed on the microstructure and texture development in the individual weld zone of friction stir welded DP780 steel |
| title_full | Effect of welding speed on the microstructure and texture development in the individual weld zone of friction stir welded DP780 steel |
| title_fullStr | Effect of welding speed on the microstructure and texture development in the individual weld zone of friction stir welded DP780 steel |
| title_full_unstemmed | Effect of welding speed on the microstructure and texture development in the individual weld zone of friction stir welded DP780 steel |
| title_short | Effect of welding speed on the microstructure and texture development in the individual weld zone of friction stir welded DP780 steel |
| title_sort | effect of welding speed on the microstructure and texture development in the individual weld zone of friction stir welded dp780 steel |
| topic | DP steel Friction stir welding (FSW) Dynamic recrystallization (DRX) Electron back scattered diffraction (EBSD) Texture |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423003605 |
| work_keys_str_mv | AT umermasoodchaudry effectofweldingspeedonthemicrostructureandtexturedevelopmentintheindividualweldzoneoffrictionstirweldeddp780steel AT seungchanghan effectofweldingspeedonthemicrostructureandtexturedevelopmentintheindividualweldzoneoffrictionstirweldeddp780steel AT teasungjun effectofweldingspeedonthemicrostructureandtexturedevelopmentintheindividualweldzoneoffrictionstirweldeddp780steel |