焼結鉄の気孔球状化に及ぼすSの影響

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概要

• 論文の詳細を見る

• The sintering process and the spheroidization of pores in the iron compacts having a small addition of sulfides such as ZnS or CaS and the gas sulfurizing treatment were investigated by means of photomicroscopic examination, DTA and EPMA. The mechanical properties of Fe-S compacts were also investigated and the correlation between the spherical pores and the properties was discussed.<BR>Upon sintering at above the eutectic temperature, a liquid phase of Fe-S was formed by the eutectic reaction of the Fe matrix and the FeS film formed at the pore surface and concentrated at the corners of sharp edged pores and at the interfaces between Fe particles. And the pore shape became more rounder without showing a remarkable shrinkage, which seemed to be due to the enhancement of neck growth between Fe particles by the surface diffusion mechanism. Because of the persistent presence of liquid phases connecting the pores during sintering, these pores were prone to coalesce easily.<BR>A small addition of sulfides to Fe compacts had little influence on tensile strength but decreased elongation. The reason for this could be attributed to the notch effect of the residual FeS found mainly at the edge of pores. The spheroidization of pores made the behaviour of ductile-brittle transition more distinctive and increased the impact strength at high temperatures.

• 社団法人 粉体粉末冶金協会の論文

著者

• 三浦 秀士

  九州大学工学部

• 鎌田 政智

  九州大学大学院

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• 焼結鉄の振動減衰特性
• 鉄系焼結材のヤング率に及ぼす気孔率と気孔形状の影響
• 焼結鉄の気孔球状化に及ぼすSの影響
• 気孔球状化処理を施した焼結鉄のヤング率測定による気孔形状の評価
• カーボニル焼結鉄のヤング率に及ぼす焼結条件の影響
• 焼結鉄のヤング率について

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