Improving the mechanical properties of an Al–Si-coated 22MnB5 steel resistance spot welding joint by adding Ni foil to suppress Fe–Al IMCs and δ-ferrite
Resistance spot welding (RSW) of press-hardened steel (PHS) with Al–Si coatings is challenging due to brittle fracture. In this paper, the joint alloying is achieved through the preset Ni foil welding method, and the microstructure, hardness, and strength of the joint are investigated. The results s...
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Elsevier
2025-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425017168 |
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| author | Fei Teng Pengcheng Huan Xiaonan Wang Zhigong Jiang Qingyu Zhang Rendong Liu Dong Lv Hongshuang Di |
| author_facet | Fei Teng Pengcheng Huan Xiaonan Wang Zhigong Jiang Qingyu Zhang Rendong Liu Dong Lv Hongshuang Di |
| author_sort | Fei Teng |
| collection | DOAJ |
| description | Resistance spot welding (RSW) of press-hardened steel (PHS) with Al–Si coatings is challenging due to brittle fracture. In this paper, the joint alloying is achieved through the preset Ni foil welding method, and the microstructure, hardness, and strength of the joint are investigated. The results show that the microstructure of the quenched Al–Si-coated steel RSW nugget tongue consists of Fe–Al IMCs and δ-ferrite. Softening is observed at the boundary between the HAZ and the nugget. Cracks are generated at the interface of the Fe–Al IMCs and the HAZ during the tensile process. The fracture mode is mixed ductile‒brittle fracture. With Ni addition, the microstructure transformation changes to lath martensite (LM) + austenite (γ) + Fe–Ni–Al solid solution + Ni. The brittle Fe–Al IMCs in the solder joints are eliminated. Boundary layer softening is eliminated. The microhardness at the boundary between the nugget and the HAZ increases from 362.2 HV to 441.8 HV due to Ni solid solution strengthening. The fracture mode is ductile fracture, and the fracture force value has increased to 23.33 kN. The mechanical properties of the solder joints are improved. |
| format | Article |
| id | doaj-art-6567488f2c5543dc9663941bd0d0efa9 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-6567488f2c5543dc9663941bd0d0efa92025-08-20T03:28:44ZengElsevierJournal of Materials Research and Technology2238-78542025-07-01373615362410.1016/j.jmrt.2025.07.058Improving the mechanical properties of an Al–Si-coated 22MnB5 steel resistance spot welding joint by adding Ni foil to suppress Fe–Al IMCs and δ-ferriteFei Teng0Pengcheng Huan1Xiaonan Wang2Zhigong Jiang3Qingyu Zhang4Rendong Liu5Dong Lv6Hongshuang Di7State Key Laboratory of Rolling and Automation, Northeastern University, Liaoning, Shenyang, 110819, People's Republic of ChinaState Key Laboratory of Rolling and Automation, Northeastern University, Liaoning, Shenyang, 110819, People's Republic of ChinaSchool of Iron and Steel, Soochow University, Jiangsu, Suzhou, 215021, People's Republic of China; Corresponding author.CCAS (Changchun) Steel Service Center Ltd, Changchun, Jilin, 130000, People's Republic of ChinaSchool of Iron and Steel, Soochow University, Jiangsu, Suzhou, 215021, People's Republic of ChinaAnsteel Iron and Steel Research Institute, Anshan, Liaoning, 114001, People's Republic of ChinaAnsteel Iron and Steel Research Institute, Anshan, Liaoning, 114001, People's Republic of ChinaState Key Laboratory of Rolling and Automation, Northeastern University, Liaoning, Shenyang, 110819, People's Republic of China; Corresponding author.Resistance spot welding (RSW) of press-hardened steel (PHS) with Al–Si coatings is challenging due to brittle fracture. In this paper, the joint alloying is achieved through the preset Ni foil welding method, and the microstructure, hardness, and strength of the joint are investigated. The results show that the microstructure of the quenched Al–Si-coated steel RSW nugget tongue consists of Fe–Al IMCs and δ-ferrite. Softening is observed at the boundary between the HAZ and the nugget. Cracks are generated at the interface of the Fe–Al IMCs and the HAZ during the tensile process. The fracture mode is mixed ductile‒brittle fracture. With Ni addition, the microstructure transformation changes to lath martensite (LM) + austenite (γ) + Fe–Ni–Al solid solution + Ni. The brittle Fe–Al IMCs in the solder joints are eliminated. Boundary layer softening is eliminated. The microhardness at the boundary between the nugget and the HAZ increases from 362.2 HV to 441.8 HV due to Ni solid solution strengthening. The fracture mode is ductile fracture, and the fracture force value has increased to 23.33 kN. The mechanical properties of the solder joints are improved.http://www.sciencedirect.com/science/article/pii/S2238785425017168Resistance spot weldingPress-hardened steelAl–Si coatingMechanical performance |
| spellingShingle | Fei Teng Pengcheng Huan Xiaonan Wang Zhigong Jiang Qingyu Zhang Rendong Liu Dong Lv Hongshuang Di Improving the mechanical properties of an Al–Si-coated 22MnB5 steel resistance spot welding joint by adding Ni foil to suppress Fe–Al IMCs and δ-ferrite Journal of Materials Research and Technology Resistance spot welding Press-hardened steel Al–Si coating Mechanical performance |
| title | Improving the mechanical properties of an Al–Si-coated 22MnB5 steel resistance spot welding joint by adding Ni foil to suppress Fe–Al IMCs and δ-ferrite |
| title_full | Improving the mechanical properties of an Al–Si-coated 22MnB5 steel resistance spot welding joint by adding Ni foil to suppress Fe–Al IMCs and δ-ferrite |
| title_fullStr | Improving the mechanical properties of an Al–Si-coated 22MnB5 steel resistance spot welding joint by adding Ni foil to suppress Fe–Al IMCs and δ-ferrite |
| title_full_unstemmed | Improving the mechanical properties of an Al–Si-coated 22MnB5 steel resistance spot welding joint by adding Ni foil to suppress Fe–Al IMCs and δ-ferrite |
| title_short | Improving the mechanical properties of an Al–Si-coated 22MnB5 steel resistance spot welding joint by adding Ni foil to suppress Fe–Al IMCs and δ-ferrite |
| title_sort | improving the mechanical properties of an al si coated 22mnb5 steel resistance spot welding joint by adding ni foil to suppress fe al imcs and δ ferrite |
| topic | Resistance spot welding Press-hardened steel Al–Si coating Mechanical performance |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425017168 |
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