Microstructural evolution and mechanical behaviors of the third–generation automobile QP980 steel under continuous tension and compression loads

Chang, Ying; Li, Jiayu; Li, Xiaodong; Wang, Baotang; Yu, Shuzhou; Wang, Cun‐Yu

doi:10.1016/j.msea.2023.145533

Cited by 4 publications

(1 citation statement)

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“…The results show that the welding speed has the greatest influence on the deformation, followed by the welding voltage and current. Chang [18] et al studied the microstructure evolution and mechanical behavior of steel under monotonic and continuous tensile/compressive loads and found that the martensitic transformation of highstrength steel is more likely to occur under monotonic tension than under monotonic compression. Zeng [19] et al found that hydrogen charging reduced the ductility of steel, resulting in a significant reduction in fatigue life and the fracture of hydrogen-containing samples showed obvious quasi-cleavage and intergranular fracture characteristics.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and cyclic hardening/softening behavior of laser welded high strength steel joints under asymmetrical cyclic loading

Zhao,

Yang,

et al. 2024

Phys. Scr.

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The cyclic behavior of materials under load and its influence on the mechanical properties of materials have always been the focus of engineering research. In this study, high strength steel was successfully welded by laser welding. The microstructure of each region of the high strength steel DP590 post-welding was meticulously analyzed. Additionally, 500 cycles of low-cycle fatigue tests of laser welded high strength steel were carried out by using asymmetric stress control method. After fatigue test, tensile test shall be carried out on some samples. Under the specific combination of mean stress and stress amplitude, compare the specimens that have not been fatigue tested with those that have been fatigue tested, the change of properties of laser welded high strength steel joint under asymmetric cyclic load was analyzed. The results showed that, due to cyclic hardening, the tensile strength of the sample increased to 601 MPa and the yield strength to 325 MPa. Compared with the original sample, the tensile strength and yield strength of the sample after asymmetric cycling had increased by 8.65% and 31.3%, respectively.

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Section: Introductionmentioning

confidence: 99%