Design of cooling route for carbide-free bainitic rail steels and resultant microstructures and properties

Xiao, Naiyou; Fei, Junjie; Li, Meiying; Zhou, Jianhua; Jia, Tao

doi:10.1016/j.msea.2023.145936

Cited by 2 publications

(1 citation statement)

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“…High-strength Cr-Ni-Mo martensitic steel is widely adopted in prop shafts and transmission shafts, etc., which have surfaces with high strength and cores with good plasticity, which are vital factors for dependability, efficiency, and emission reductions. This characteristic promises wear and fatigue resistance with high torsion strength, especially for lightweight-designed components operating at high power density [ 1 , 2 , 3 ]. The lightweight-designed component has been greatly supported by heat treatment and other surface-strengthening methods such as ultrasonic surface rolling (USR) and shot peening, which is applied in industries concerning vehicles, aerospace, shipping, etc., for energy conservation [ 4 , 5 , 6 ].…”

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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