Comparation of Friction Behavior Between Galvanized and QPQ Treated Pins

Li Jie, Deng Yunzhe, Zhou Bo

China Surface Engineering ›› 2021, Vol. 34 ›› Issue (3) : 178-184.

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China Surface Engineering ›› 2021, Vol. 34 ›› Issue (3) : 178-184. DOI: 10.11933/j.issn.1007-9289.20210305001

Comparation of Friction Behavior Between Galvanized and QPQ Treated Pins

  • Li Jie, Deng Yunzhe, Zhou Bo
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Abstract

As an effective way to improve the wear resistant property and service life of mechanical components, surface treatment has been widely used in industrial fields. Pins made of 40Cr steel, used on the grab of a certain type of petroleum equipment product manipulator, were galvanized and Quench-Polish-Quench (QPQ) treated, respectively. Then, dry friction behaviors in ball-on-plate reciprocating mode of base metal and two different surface treated samples were studied comparatively, and acoustic emission (AE) signals produced in the friction process were also recorded and analyzed. The results showed that the surface hardness of QPQ treated sample was significantly increased and the hardness distribution in depth direction met the design requirements, with effective hardening layer depth of 0. 3mm. Fine and uniform tempered sorbite were observed in base metal of all samples, with coating thickness of 25 μm for galvanized sample, and oxide layer+compound layer+diffusion layer for QPQ treated sample. The curves of coefficient of friction (CoF) vs. time of all samples illustrated different changing laws, increasing first and then decreasing to a stable value. The CoF of galvanized sample was higher, and the maximum value is 0. 50, then gradually stabilized at 0. 36; while the maximum value of QPQ treated sample was only 0. 18, and rapidly reached the stable stage to 0. 16. At the same time, the micro fluctuations on the friction curve of the galvanized sample was more obvious, showing greater instability in the friction process. The maximum depth of wear track of galvanized sample was slightly smaller than that of QPQ ones, with bigger maximum width and larger wear volume. Thehigher the CoF was, the more AE signal events were counted, demonstrating a corresponding relationship between the number of AE signal events and each stage of friction and wear. Relatively more AE signals and higher energy signals were monitored in friction process of galvanized sample than QPQ treated ones.

Key words

galvanized; Quench-polish-quench (QPQ) treatment; friction and wear; acoustic emission (AE)

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Li Jie, Deng Yunzhe, Zhou Bo. Comparation of Friction Behavior Between Galvanized and QPQ Treated Pins[J]. China Surface Engineering, 2021, 34(3): 178-184 https://doi.org/10.11933/j.issn.1007-9289.20210305001

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