浸炭歯車材のTiC被覆処理による疲労強度への影響

概要

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The purpose of this study is to investigate the fatigue strength of carburized gear steel chemically vapor deposited with titanium carbide, and to clarify the main effect of carburized gear steel coated with titanium carbide on fatigue strength, including comparison with noncoated steel. Case depth of carburized gear d_<eff> is 1.3 mm. Quenching and tempering heat treatment after coating was also introduced. Smooth specimen, that is, flat plates and spur gear, module 4 with number of teeth 55, were supplied to fatigue test. Residual stress in TiC surface layer and substrate was detected by X-ray diffraction method. It is concluded that main effect on fatigue strength of chemically coated steel on carburized steel is substrate hardness near surface layer, and residual stress in titanium carbide layer doesn't effect prominently on fatigue strength. And finally it is found that the residual stress in both TiC layer and substrate near interface indicates possibility of a micro crack initiation at the interface between titanium carbide and substrate.
一般社団法人日本機械学会の論文
1993-01-25