Analysis on friction and wear properties of materials for circular gear of harmonicgear reducers

doi:10.13251/j.issn.0254-6051.2024.01.007

Abstract

Abstract: Friction behaviors of two nodular cast irons (QT1 and QT2) and 40Cr steel used for domestic circular gear were studied by quantitative analysis of alloy composition, microstructure and wear resistance. The results show that for the QT1 and QT2 cast irons, the matrix is composed of pearlite, retained austenite and acicular ferrite, while the spheroidal graphite has very high nodularity and fine size. The worn positions of the QT1 and QT2 cast irons are concentrated with small fluctuations, and the maximum worn surface depths are 3.7 μm and 2.6 μm respectively. The wear morphologies of the 40Cr steel are furrows with varying depths and large fluctuations, and the maximum depth is 7.6 μm. Compared to the 40Cr steel, the QT1 and QT2 cast irons have excellent wear performance and lower friction coefficient. Domestic harmonic reducer enterprises can use nodular cast iron as circular gear material instead of the 40Cr steel.

Key words: circular gear, nodular cast iron, 40Cr steel, wear resistance

CLC Number:

TG143.5

Shao Zhuhao, Yang Dawei, Wu Yongjin, Liu Zhao, Zhao Liang. Analysis on friction and wear properties of materials for circular gear of harmonicgear reducers[J]. Heat Treatment of Metals, 2024, 49(1): 47-52.

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