Investigation of microstructural evolution and crack extension in a quenching and partitioning (Q &amp; P) steel at different strain rates

Zhang, Shaolong; Zhou, Wenda; Zhou, Songbo; Hu, Feng; Yershov, Serhii; Wu, Kaiming

doi:10.1016/j.jmrt.2023.03.149

Cited by 12 publications

(1 citation statement)

References 63 publications

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“…Retaining carbon-rich metastable retained austenite (RA) in a martensitic matrix by a quenching and distribution (Q&P) process has been proven to be useful for multiphase high-strength steels without reducing their plasticity. This ingenious design is based on the transformation-induced plasticity (TRIP) of retained austenite during deformation, and the TRIP effect increases the work hardening rate and plasticity of highstrength steels [1][2][3]. Q&P steel, carbide-free bainitic (CFB) steel, medium manganese (MMn) steel, etc, as the third generation advanced high-strength steel (AHSS), have good comprehensive mechanical properties and low alloy content, while meeting the needs of lightweight and collision safety, which have great potential in the lightweight development of the automotive industry [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen charging intensities and times on hydrogen embrittlement of Q&P980 steel

Zhao,

Chen,

Zhang

et al. 2024

Mater. Res. Express

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Q&P steel has good development prospects because of its excellent mechanical properties, but with the improvement in strength grade, hydrogen-induced delayed fracture (HIDF) is almost inevitable. In this paper, slow strain rate tensile tests and deep-drawn cup tests of Q&P980 steel under different hydrogen charging strengths and times were carried out, and the microstructure and fracture morphology were analysed by SEM. The results show that the plastic loss of Q&P980 steel was more obvious with increasing hydrogen charging intensity and hydrogen charging time, and a good elongation of 6.63% is still retained under the hydrogen content of 2.134 ppm. The deep-drawn cup samples were placed in acidic distilled water and alkaline and acidic solutions, and only a deep-drawn ratio of 1.9 showed HIDF in the three solutions. Specifically, 12 cracks were observed after soaking in HCl solution for two days. The main reason is that the martensite, austenite island and ferrite phase interface of Q&P980 steel increase stress during deformation and with the transformation-induced plasticity (TRIP) effect, resulting in hydrogen segregation at the phase interface and crack initiation leading to HIDF.

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