Role of martensite morphology on mechanical response of dual-phase steel produced by partial reversion from martensite

Shi, Peng; Ren, Yingjie; Zhang, Xianguang; Wang, Hongli; Chen, Jiajun; Pei, Yiwu; Yan, Jianhao; Zheng, Huaibei; Zhang, Jian

doi:10.1016/j.msea.2024.146116

Cited by 4 publications

(1 citation statement)

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“…This process induces a multitude of filmy retained austenite (RA) close to bainite with a high carbon concentration and good stability, while the area separate from bainite has more pronounced carbon precipitation, and blocky RA in a low carbon concentration is formed with less stability. Blocky RA and martensite form martensite/austenite (M/A) islands, which are split into smaller grains by bainite [ 9 , 10 , 11 ]. A high content of stable RA promotes the transformation-induced plasticity (TRIP) effect when steel is deformed by an external force, in which RA would transform into martensite with phase transformation strengthening and plastic growth as cracks nucleate and cluster around martensite.…”

Section: Introductionmentioning

confidence: 99%

Study of Quenching and Partitioning (Q&P) and Ultrasonic Surface Rolling (USR) Process on Microstructure and Mechanical Property of a High-Strength Martensitic Steel

Hou,

Duan,

et al. 2024

Materials

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Steel with a combination of strength and plasticity is prevalently demanded for lightweight design and emission reductions in manufacturing. In this study, a high-strength Cr-Ni-Mo martensitic steel treated by quenching and partitioning (Q&P) and ultrasonic surface rolling (USR) processes was studied for both strength and plasticity enhancement. Specimens were austenitized at 850 °C and then quenched to 240 °C via cooling by water, oil, and normalization in quenching. This was followed by partitioning, in which two groups of specimens were heated to 370 °C and 350 °C for 45 min, respectively. At last, all the specimens were quenched to room temperature with the same methods of quenching. The highest tensile strength increased from 681.73 MPa to 1389.76 MPa when compared to as-received (AR) steel after the Q&P process. The USR process with a static force of 800 N further improved the tensile strength of specimens with high tensile strength after the Q&P process, which improved from 1389.76 MPa to 1586.62 MPa and the product’s strength and elongation (PSE) increased from 15.76 GPa% to 15.9 GPa%, while the total elongation showed a mitigatory decrease from 11.34% to 10.02%. Tensile fractures were also studied and verified using a combination of strength and plasticity after a combined process of Q&P and USR.

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Section: Introductionmentioning

confidence: 99%