Microstructure and Mechanical Property of Resistance Spot Welded Joint of Dissimilar Steels of TRIP 980 High Strength Steel and SPCC Low Carbon Steel

doi:10.11901/1005.3093.2017.268

Chinese Journal of Materials Research

2018, Vol. 32

Issue (3): 216-224 DOI: 10.11901/1005.3093.2017.268

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Microstructure and Mechanical Property of Resistance Spot Welded Joint of Dissimilar Steels of TRIP 980 High Strength Steel and SPCC Low Carbon Steel

Yaodong CEN^1,², Furong CHEN¹(

)

1 School of Materials Science and Engineering of Inner Mongolia University of Technology, Hohhot 010051, China;
2 School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;

Cite this article:

Yaodong CEN, Furong CHEN. Microstructure and Mechanical Property of Resistance Spot Welded Joint of Dissimilar Steels of TRIP 980 High Strength Steel and SPCC Low Carbon Steel. Chinese Journal of Materials Research, 2018, 32(3): 216-224.

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Abstract

TRIP (transformation induced plasticity) 980 high strength steel and SPCC (steel plate cold common) low carbon steel of about 1.5 mm in thickness were welded by resistance spot welding. The optimal welding parameters were acquired according to the test results of the joint shear tensile load. Then the performance and microstructure of the spot welded joint prepared by the optimal process were characterized by means of electronic tensile testing machine, micro-hardness meter, OM, SEM, EBSD and EDS. Results showed that the metallurgical bonding between the two base materials is realized, the molten nuclear of the spot welded joint is oval and has large deviation, molten nuclear of the side of SPCC steel is smaller than that of the TRIP980 one. The interface can obviously be observed in molten core region of spot welded joint. Shear tensile fracture of the spot welded joint is located at the interface, which is close to the edge of fusion zone of the side of SPCC steel, and the fracture is brittle fracture. The microhardness of molten nuclear on the side of the SPCC steel is lower than that of the TRIP980 one, but there existed a peak value of the hardness of nugget zone on the side of the SPCC steel. Elements of C, Mn, Si and Al etc. presented different diffusivity in the molten nuclear, and of which the concentration declines from the side of the TRIP980 steel to that of the SPCC one. The microstructure of the side melting zone of SPCC low carbon steel is quite different. The microstructure near the parent material is soft ferrite. The microstructure near the nugget side is hard martensite. The stress concentration caused by this difference is the main reason that affects the mechanical properties of the joints.

Key words: metallic materials dissimilar steel microstructure mechanical properties resistance spot welding

Received: 19 April 2017

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.268 OR https://www.cjmr.org/EN/Y2018/V32/I3/216

Table 1 Chemical compositions and mechanical properties of TRIP980 and SPCC

Fig.1 Schematic diagram of sample size and overlap method (unit: mm)

Fig.2 Macroscopic and microstructure of welding current 8 kA, welding time 25 cycle, electrode pressure 4 kN of resistance spot welded joints (a) macroscopic of resistance spot welded joints, (b) heat affected zone near the edge of TRIP980 high strength steel and SPCC steel low carbon steel binding surface, (c) fusion zone of SPCC low carbon steel side, (d) the nugget of SPCC low carbon steel side, (e) combined surface, (f) the nugget of TRIP980 high strength steel side, (g) fusion zone TRIP980 high strength steel side

Fig.3 EDS detection results of welding current 8 kA, welding time 25 cycle, electrode pressure 4 kN of resistance spot welded joints (a) schematic diagram of detection path, (b) line scanning path 1, (c) line scanning path 2, (d) line scanning path 3

Fig.4 SEM image (a) and EDS components (b)

Fig.5 (a) SEM image, (b) EDS components

Fig.6 EBSD detection results of welding current 8 kA, welding time 25 cycle, electrode pressure 4 kN of resistance spot welded joints (a) schematic diagram of detection path, (b) in the fusion nuclear combined surface of spot welding joint

Fig.7 Hardness test results of different area and position of welding current 8 kA, welding time 25 cycle, electrode pressure 4 kN of spot welding joint, (a) schematic diagram of the path of hardness testing, (b) hardness test results in vertical direction, (c) hardness test results in horizontal direction, (d) hardness test results of 45 degree direction

Fig.8 Welding current 8 kA, welding time 25 cycle, electrode pressure 4 kN of resistance spot welded joints shear tensile displacement curve

Fig.9 Welding current 8 kA, welding time 25 cycle, electrode pressure 4 kN of resistance spot welded joints (a) shear tensile fracture, (b) fracture surface

Table 2 Shear tensile properties

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