铁基粉末冶金齿轮断裂失效分析及其工艺改进研究

doi:10.3976/j.issn.1002-4026.2020.02.005

Abstract

Abstract: The teeth of a powder metallurgy gear were fractured during operation. A large number of globular iron-carbon compounds were found at the fracture site using SEM and EDS analysis, which indicates a weak bonding between powders resulting from an insufficient sintering temperature and duration of the original process. An improved sintering process and a new process of pressing, sintering, quenching, and low-temperature tempering were applied to Fe-1.8Ni-0.5Mo-1.2Cu-0.2C prealloyed powder. The pearlite quantity in the prepared gear is 60, and the new prepared gear comprises tempered martensite and ferrite subsequent to heat treatment. The impact toughness improved from 9.8 J/cm² to 15.2 J/cm².

Key words: iron based, powder metallurgy, fracture failure, gear, fracture

CLC Number:

TF124

CHEN Yan-fei, SONG Xiao-cun, LAI Hua-sheng, WEN Xiao-qiang, ZHOU Ji-xue. Fracture failure analysis and process improvement of iron-based powder metallurgy gears[J].Shandong Science, 2020, 33(2): 27-32.

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Fracture failure analysis and process improvement of iron-based powder metallurgy gears

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