Microstructure and Fatigue Fracture of Spot Welded TRIP800 Steel

Hua Wu; Bin Zhao; Hua Gao; Zhen Bo Zhao; Cheng Liu

doi:10.4028/www.scientific.net/AMM.789-790.15

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 789-790Microstructure and Fatigue Fracture of Spot Welded...

Microstructure and Fatigue Fracture of Spot Welded TRIP800 Steel

Abstract:

The fatigue property of a TRIP (transformation induced plasticity) steel after resistance spot welding (RSW) is investigated. It is found that the fatigue strength of the spot weld is only 8.9% of the original TRIP800 steel. This is a result of microstructure mismatch in heat affected zone (HAZ) due to different cooling rates during RSW. A maximum variation of about 220HV microhardness is observed at different areas from the relatively narrow HAZ. The fatigue degradation is attributed to the inhomogeneous distributions of microstructure and microhardness at HAZ and its adjacent zones. The fatigue crack initiated between HAZ and BM is a cleavage fracture as confirmed by scanning electron microscopy (SEM) observation.

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Periodical:

Applied Mechanics and Materials (Volumes 789-790)

Pages:

15-19

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.789-790.15

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Online since:

September 2015

Authors:

Hua Wu, Bin Zhao, Hua Gao, Zhen Bo Zhao, Cheng Liu*

Keywords:

Fatigue, Hardness, Microstructure, Resistance Spot Welding, TRIP Steel

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* - Corresponding Author

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