挖掘机链轨节失效分析及改善

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Abstract： During the service life of the excavator crawler track link，failure problems such as cracks and chipping occur.A comprehensive failure analysis of the track link is carried out through tests of chemical composition， hardness，microstructure，fracture morphology，finiteelement，etc.Theresultsshow thatthecracks inthe track link arefatigue cracks，and thereare stress-concentration areas inits structure.Throughdissection analysis，itis found thatthe tempered grain sizeandthe martensite structure in the hardenedareaarerelativelycoarse，while there are no obvious abnormalities in other inspection items.Based on the analysis results，design optimization is carried out to avoid stress - concentration areas.Moreover，the matrix grain size is improved by optimizing the quenching and tempering process，and the martensite structure is refined by improving the tread hardening process Through the above improvement measures，the comprehensive properties of the track link，such as strength， toughness，and impactresistance，are enhanced，and the failure problemsof cracksand chipping of the track link are significantly improved.

Keywords： track； link； crack； failure； tempering

1序言

链轨节是履带式工程机械履带总成的关键零件。（剩余3773字）