ZG310-570滑轮架轴座断裂失效分析

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Abstract：A ZG310-57O pulley shaftseat fractured during service.Through the analysis and verification of the fractured shaft seat， including fracture observation， chemical composition analysis， microstructural examination， and mechanical property testing，the results show that： the ZG310-57O shaft seat exhibits typical britle fracture characteristics， with most of the fracture surface being cleavage planes and a smallnumber of secondary cracks in local areas.The microstructure of the fractured shaft seat mainly consists of Widmanstatten structure and intragranularacicular ferite，along with avery smallamount oflamellar pearlite.Its chemicalcompositionmeets thestandardrequirements，and there are extremely fewoxide inclusions inlocalregions.The britle Widmanstätten structureis the maincauseof theshaftseatfracture.Thefractureoriginatedfromthecoreofthepart，andthecracks propagated from thecore to the surroundings，forming river patterns，which eventually led to the fracture of the entire part.

Keywords：ZG31O-57O; shaft seat;microstructure; fracture failure

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ZG310-570作为一种优质铸造碳素钢，是一种兼具优异力学性能和经济性的工程机械常用材料，广泛应用于各种零部件的制造[1-3]。（剩余3517字）