ダイカスト金型鋼に関する研究(第5報) : 真空-ガス窒化処理金型鋼の熱疲労特性

概要

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Vacuum-gas nitriding process is an effective method for controlling the thickness of nitride layer on the surface of hot die steel. This study has been carried out for increasing the life of die steel. Thermal fatigue characteristics of samples treated by the vacuum-gas nitriding process were evaluated by means of thermal fatigue test, erosion test and X-ray analysis. Fe_<2-3>N nitride layer was not observed by the X-ray analysis in the surface layer of the sample. The hardness of sample surface was in the range of HV 800〜900,which was lower than that of the tufftriding sample, i.e., HV 1200〜1400. Erosion resistance was lower than that of tufftriding sample. It was found that the thermal resistance increased by the vacuum-gas nitriding process and the nitrogen concentration in the diffusion layer formed by the process did not change during the thermal fatigue test.
公益社団法人精密工学会の論文
1991-06-05