Influence of banded structure on Jominy end quenching hardness of 20CrMn gear steel

doi:10.13251/j.issn.0254-6051.2025.05.020

Abstract

Abstract: Banded structure in 20CrMn gear steel was studied by using optical microscopy, scanning electron microscopy and high-resolution double focusing magnetic sector mass spectrometer with inductively coupled plasma. The relationship between the Jominy end quenching hardness fluctuations of the steel and its banded structure was analyzed. The results show that the banded structure causes abnormal fluctuations in Jominy end quenching hardness, which exhibits either higher or lower hardness measurements simultaneously. The standard deviation of band width of the banded structure can reflect the degree of inhomogeneity of the microstructure. Through data processing and fitting analysis, it shows that there is a polynomial relationship between the standard deviation of band width of the banded structure and the measured hardness fluctuations.

Key words: 20CrMn gear steel, banded structure, hardenability

CLC Number:

TB403.4

Zhao Hao, Liu Xinkuan, Zhang Ke, Ma Fengcang, Li Wei, Liu Ping. Influence of banded structure on Jominy end quenching hardness of 20CrMn gear steel[J]. Heat Treatment of Metals, 2025, 50(5): 124-131.

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