ダイカスト金型鋼に関する研究(第3報) : 軟窒化および浸硫窒化処理した熱間金型鋼の熱疲労特性

概要

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The effects of tufftriding and sulphonitriding treatments on the life of hot die steel have been investigated. The thermal fatigue test, erosion test, X-ray probe microanalyses and optical microscopy of hot die steel samples were carried out after tufftriding and sulphonitriding treatments. It was found in the thermal fatigue test that the number of cracks per unit area of tufftrided and sulphonitrided samples markedly smaller than those of ordinary SKD61 sample. For the tufftrided sample, the high concentration region of nitrogen, i. e., Fe_<2-3>N compound layer, disappeared and became a diffusion layer after the test. For the sulphonitrided sample, the surface layer was contained oxide and nitride, and the nitride was disappeared after the thermal fatigue test. In the erosion test, the sulphonitrided sample showed the most excellent erosion resistance, i. e., 10 times of the tufftrided sample and 30 times of the ordinary SKD61 sample.
公益社団法人精密工学会の論文
1990-08-05