ガス浸炭炉熱処理を施したPDI材とADI材の高サイクル疲労強度および耐摩耗性の比較評価

概要

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With a gas carburizing treatment processed to pearlitic ductile cast iron (CPDI), the investigations were carried out about its high cycle fatigue strength and abrasive wear resistance. The high cycle fatigue strength were evaluated by rotating bending fatigue tests, and the fatigue strength was improved about 20 MPa greater than virgin test pieces not-carburized (PDI). The crack initiating point and fracture is from irregular graphites of surface or from microdefects in casting, which PDI and CPDI specimens were not in an inner type fracture. Furthermore, a good result was obtained in the abrasive wear resistance test than in that of austempered ductile cast iron (ADI). Those were expressed by the difference of matrix structures. Its matrix structure of CPDI is transformed a martensite structure from SEM observation.
1998-09-25