オーステナイト可鍛鑄鐵の研究 (I)

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概要

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• A large numuber of researches to shorten the time of anneal, graphitising of white cast iron have been done during the past ten years. Generally speaking, more than eighty hours annealing of first and second stage has to be done to produce the ordinary black heart malleable cast iron. In black heart malleable cast iron, however, it has been shown that any type of malleable cast irons having perfect ferritic matrix can not get rid of first or second stage annealing from each malleablising process. Researches were directed towards to get the black heart malleable cast iron only by one stage graphitising. Adding sufficient manganese to casting changes its matrix austenitic, but all carbon remains in the form of free carbide. Annealing, however, at 950℃ for 40 to 60 hours in reducing or neutral atmosphere graphitises all free carbide. This is the austenitic malleable cast iron, having micrographic structure with temper carbon and austenitic matrix in room temperature.

• 1951-09-25

著者

• 提 信久

  早稲田大學鑄物研究所

関連論文

• オーステナイト可鍛鑄鐵の研究 (I)

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