A Mesoscale Crystal Plasticity Model to Predict Room-Temperature Deformation and Martensitic Transformation of High-Strength Quenching and Partitioning (Q&amp;amp;P) Steels and Validation with Synchrotron X-ray Diffraction

Cheng, Jiahao; Lin, Brian  K.; Pottore, Narayan; Sadagopan, Sriram; Zhu, Hong; Hu, Xiaohua

doi:10.2139/ssrn.4591371

Cited by 1 publication

(1 citation statement)

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“…The rapid development of economy and the intensification of energy crises have resulted in an increasing demand for ultrahigh-strength steels (referring to steels with a tensile strength of approximately 1500 MPa) [1][2][3][4][5]. Ultrahigh-strength steel is widely used in fields such as the power industry, building materials, metallurgy, coal mining, and agricultural machinery.…”

Section: Introductionmentioning

confidence: 99%

The Fabrication of Ultrahigh-Strength Steel with a Nanolath Structure via Quenching–Partitioning–Tempering

Xu,

Xie,

Liu

et al. 2024

Materials

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A novel low-alloy ultrahigh-strength steel featuring excellent mechanical properties and comprising a nanolath structure was fabricated in this work using a quenching–partitioning–tempering (Q-P-T) process. The Q-P-T process comprised direct quenching and an isothermal bainitic transformation for partitioning after thermo-mechanical control processing (online Q&P) and offline tempering (reheating and tempering). The ultrafine nanolath martensite/bainite mixed structure, combined with residual austenite in the form of a thin film between the nanolaths, was formed, thereby conferring excellent mechanical properties to the steel structures. After the Q-P-T process, the yield and tensile strengths of the steels reached 1450 MPa and 1726 MPa, respectively. Furthermore, the Brinell hardness and elongation rate were 543 HB and 11.5%, respectively, with an average impact energy of 20 J at room temperature.

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