Effect of heat treatment process on microstructure and properties of base steel 30Cr4MoNiV for bi-metal band saw blade

doi:10.13251/j.issn.0254-6051.2022.01.044

Abstract

Abstract: Microstructure and mechanical properties of 30Cr4MoNiV steel used for bi-metal band saw blade after quenching at 1150-1190 ℃ and tempering at 520-640 ℃ were investigated by means of scanning electron microscope (SEM), Rockwell hardness tester and universal testing machine, and the fatigue properties of the 30Cr4MoNiV steel were tested by bending fatigue test and cutting test. The results show that the suitable quenching temperature of the 30Cr4MoNiV steel is 1190 ℃, at which the alloying elements are fully dissolved and the resulted martensite structure is uniform and fine; the optimal tempering temperature is 600 ℃, at which the microstructure is tempering sorbite. After quenching at 1190 ℃ and tempering at 600 ℃ for three times, the product of strength and elongation of the 30Cr4MonIV steel is 15.64 GPa·%, the bending fatigue performance increases from 3745 to 5270 times, and the sawing fatigue performance is 25.6% higher than that of imported CDW steel.

Key words: bi-metal band saw blade, base steel 30Cr4MoNiV, heat treatment, microstructure, fatigue properties

CLC Number:

TG161

Chen Gang, Yao Yuanchao, Jia Yuzhen, Su Bin, Liu Guoyue, Zeng Bin. Effect of heat treatment process on microstructure and properties of base steel 30Cr4MoNiV for bi-metal band saw blade[J]. Heat Treatment of Metals, 2022, 47(1): 266-270.

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