焼結Cr鋼の窒化層

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タイトル別名
  • On the Nitrided Layer of Sintered Cr-Steel
  • ショウケツ Cr コウ ノ チッカソウ

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Sintered Cr-steels containing 1-3% Cr were prepared from the mixtures of iron powder, Cr3C2 powder and graphite powder, by compacting and sintering at 1250°C in vacuum. Specimens were nitrided at 500°C in an ammonia gas atmosphere, and the nitrided layer was examined. The results obtained are as follows:<BR>(1) Specimens containing more than 2%Cr give nearly same hardness distribution pattern after nitriding for 1 hr, compared with that of conventional Cr-steel nitrided for long time.<BR>(2) Rapid nitriding is due to the penetration of nitriding gas through pores of specimen, therefore nitrides are formed on the inner surface of pores and grain boundaries connecting with pores.<BR>(3) Although sintered specimens absorb large amounts of nitrogen, an X-ray diffraction pattern of the surface layers clearly shows a phase peak. This peak shifts to lower angle direction with an increase of Cr content, which shows lattice strain of a phase, and may contribute to the hardness increase.

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