Two-Step Isothermal Bainitic Transformation in Medium-Carbon Low-Si Steels with Exceptional Mechanical Properties and Wear Resistance

Ren, Wei; Zhang, Z.; Zhang, J.; Yang, Ruizhi; Yu, C. S.; Liaw, Peter K.; Wu, Yuqi; Qiao, Junwei

doi:10.1007/s11665-023-07857-x

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“…Such as, Ren et al adopted two-step isothermal bainitic-transformation treatment to medium-carbon low-Si steels, and led to an exceptional mechanical properties and wear resistance. [15] The transformation temperatures in these works are mainly between B-transition start temperature (Bs) and martensitic-transformation start temperature (Ms). [11] Different from previous works, to obtain finer B lath microstructure, some scholars [14,16,17] put the B-isothermal-transformation temperatures below Ms. Feng et al pointed out that 42CrMo4 steels austempered at 310 °C (below Ms, 331 °C), exhibited a mixture of ultrafine-grained B and M, and finally improved the ultimate tensile strength (UTS) from 1359 to 1684 MPa.…”

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confidence: 99%

Achieving Excellent Strength–Ductility Combination by Austempering below Ms in 40CrNiMo Steels

et al. 2023

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Herein, the microstructure evolution and mechanical properties of the 40CrNiMo steel treated by different austempering temperatures are investigated. With the decrease in austempering temperatures from 270 to 180 °C, the volume fraction of bainite decreases, and the martensite fraction increases. The austenite content is about 8% at 270 °C, and then increases over 12% at 240≈180 °C. The mean grain size decreases from 270 to 180 °C, which is related to the reason that the development of bainite/austenite interface is restricted for the martensite formation. The yield strength increases from 1153 to 1323 MPa by refinement hardening and dislocation hardening, and ultimate tensile strength increases from 1193 to 1731 MPa at from 270 to 180 °C. The elongation is about 13% at 210≈270 °C, and then decreases at 180 °C.

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