含チタン迅速窒化鋼の窒化に対する諸元素の影響ならびに窒化条件の研究

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タイトル別名
  • Ti-Containing Rapid Nitriding Steel (1st Report). Effects of Elements and Nitriding Conditions on Ti-Containing Steels
  • ガン チタン ジンソク チッカ コウ ノ チッカ ニ タイスル ショ ゲンソ ノ エイキョウ ナラビニ チッカ ジョウケン ノ ケンキュウ

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抄録

Nitrization, heretofore in use, has many advantages, viz:- the heat resistivity of hardened layer is excellent and heat treatment after nitrization is not neccesary. But the time of nitrization is very long. The affinity of Ti to nitrogen is so large that diffusion or addition of Ti may accelerate nitrization and, experiments were carried out on this point of view. The results obtained were as follows: (1) By diffusing Ti before nitriding, hard (VHN: 1450) layers were formed, but no good surface could be obtained. (2) Next, we prepared Ti-containing steels (Ti: 1.5, 5.0, 9.0%) and nitrized. The specimens, containing more than 5% of Ti, were sufficientry hardened in a short time (9∼18 hrs) by nitriding at 550∼650°C. The higher the nitriding temperature, the smaller the hardness, and the thicker the layer grows. The surface of steel free of carbon was harder, but more brittle than that of steels containing carbon. (3) Steels containing Ti and Cr were prepared and the same experiments were carried out. In this case, steels with less than 2% of Ti could not be hardened. And it was found that Cr had no effects on the surface hardness, but the surface conditions were largely improved by Cr. Hard (maximum hardness is about VHN: 1200) and thick (about 0.4 mm) layers were obtained by nitrization at 650°C for 4 hrs. The effects of nitriding temperature and carbon content were the same as in Ti-steels. The surface hardness of steels, melted in vacuum, was slightly higher than that of samples melted in air. (4) Heat-resisting tests were carried out on these specimens, the surface hardness of Ti-Cr-steels was kept unchanged by reheating at 500∼600°C, but was lowered by reheating at 700°C.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 26 (6), 370-375, 1962

    公益社団法人 日本金属学会

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