e angle was big,the crack would stop.When the stress accumulated to some degree, the crack would propagate through the hard phase.The final failure was not caused by only one crack,the main crack depresses others.AnalysisРresults about stress distribution showed that,stress concentration occuredРat bottom face of samples,then cracks initiated.With the propagation ofРcracks,tensile stress concentrated to the crack tip to form a type of IРpress stress appeared at loading point and catch points.With the increasing volume ratio,the wider variation range of particle size,or the larger average particle size of the hard—phase,this alloy often exhibitsРhigher strength.РKeywords:Cemented carbide;Thermal shock;Microstructure evolution; Oxidation;High—temperature deform;Impact fatigueРVlIР嗡甜《《,盎毯瓣龇嚣一
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