Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α/) steel joints
This research work focuses on production of sound weld by Resistance Spot Welding (RSW) process and correlate the mechanical properties of Dual Phase (DP) steel joints with its microstructural features. The main application of resistance spot welding was used to build white body assembly in automoti...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/ab654d |
| _version_ | 1797747061789032448 |
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| author | C Rajarajan P Sivaraj V Balasubramanian |
| author_facet | C Rajarajan P Sivaraj V Balasubramanian |
| author_sort | C Rajarajan |
| collection | DOAJ |
| description | This research work focuses on production of sound weld by Resistance Spot Welding (RSW) process and correlate the mechanical properties of Dual Phase (DP) steel joints with its microstructural features. The main application of resistance spot welding was used to build white body assembly in automotive industry. The welded joint recorded maximum value of 21.3 kN in TSFL and 18.3 kN in CTSFL. The Scanning Electron Microscope (SEM) and Optical Microscope (OM) of the Nugget Zone (NZ) revealed lath/needle like microstructures with effect of severe cooling rate. The TEM microstructure exposed the formation of martensite ( α ^/ ) in the Nugget Zone (NZ) and tempered martensite (T α ^/ ) in Heat Affected Zone (HAZ), which accounts for superior joint strength of DP lap shear joints. Furthermore, crystallography studies reported the phase composition and crystallinity in weldments as cementite and magnesium carbide in [101] and [200] indices that accounts for high hardness of 584 Hv in the weldments. |
| first_indexed | 2024-03-12T15:45:46Z |
| format | Article |
| id | doaj.art-237104412b4246078861fc6294eef788 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:45:46Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-237104412b4246078861fc6294eef7882023-08-09T15:24:59ZengIOP PublishingMaterials Research Express2053-15912020-01-017101655510.1088/2053-1591/ab654dMicrostructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α/) steel jointsC Rajarajan0https://orcid.org/0000-0003-4609-4711P Sivaraj1https://orcid.org/0000-0002-3989-5484V Balasubramanian2Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University , Annamalai Nagar—608 002, IndiaCentre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University , Annamalai Nagar—608 002, IndiaCentre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University , Annamalai Nagar—608 002, IndiaThis research work focuses on production of sound weld by Resistance Spot Welding (RSW) process and correlate the mechanical properties of Dual Phase (DP) steel joints with its microstructural features. The main application of resistance spot welding was used to build white body assembly in automotive industry. The welded joint recorded maximum value of 21.3 kN in TSFL and 18.3 kN in CTSFL. The Scanning Electron Microscope (SEM) and Optical Microscope (OM) of the Nugget Zone (NZ) revealed lath/needle like microstructures with effect of severe cooling rate. The TEM microstructure exposed the formation of martensite ( α ^/ ) in the Nugget Zone (NZ) and tempered martensite (T α ^/ ) in Heat Affected Zone (HAZ), which accounts for superior joint strength of DP lap shear joints. Furthermore, crystallography studies reported the phase composition and crystallinity in weldments as cementite and magnesium carbide in [101] and [200] indices that accounts for high hardness of 584 Hv in the weldments.https://doi.org/10.1088/2053-1591/ab654dresistance spot weldingTSFLCTSFLhardnessmicrostructurecrystallography |
| spellingShingle | C Rajarajan P Sivaraj V Balasubramanian Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α/) steel joints Materials Research Express resistance spot welding TSFL CTSFL hardness microstructure crystallography |
| title | Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α/) steel joints |
| title_full | Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α/) steel joints |
| title_fullStr | Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α/) steel joints |
| title_full_unstemmed | Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α/) steel joints |
| title_short | Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α/) steel joints |
| title_sort | microstructural analysis of weld nugget properties on resistance spot welded advance high strength dual phase α α steel joints |
| topic | resistance spot welding TSFL CTSFL hardness microstructure crystallography |
| url | https://doi.org/10.1088/2053-1591/ab654d |
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