窒化作用を鋼の表面硬化に應用の研究
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概要
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Taking ten kinds of carbon and special steels, the author treated them with current of ammonia at various temperatures to obtain hard layers by the formation of nitrides. He tested the specimens at the temperatures from 560℃ to 580℃, the times being 5, 15 and 30 hours and determined the scratch hardness and the length before and after the treatment. According to his observation, the increments of hardness and length varied from 200 to 460 in Brinell hardness number and from 0.003 to 0.09 in mm. respectively. He next examined the shock test on the nitrated specimens and also observing the variation of their hardness in annealing at the temperatures from 300℃ to 800℃, found that the hardness did not decrease up to about 600℃ in general. Lastly, the photomicrographs of various specimens before and after the treatment are shown.
- 社団法人日本鉄鋼協会の論文
- 1928-12-25