Ni-Cr 系合金におよぼす窒素の影響 : 耐熱材料における合金元素としての窒素の作用について I

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The effect of nitrogen on nichrome and Nimonic alloys were investigated. These alloys were prepared in the following manners by using raw metals of high purity by melting rapidly in a Tammann furnace : (a) melted in air, (b) melted in air and added nitrogen in the form of nitrided chromium. The nitrogen content of all alloys melted in air was in the range of 0.03∿0.04%N. Chemical analyses of these alloys showed large amount of "soluble" nitrogen (soluble in hydrochloric acid : water=1 : 1) in nichrome and of "insoluble" nitrogen (insoluble in hydrochloric acid but soluble in fuming sulphuric acid) in Nimonic alloys. Hence, nitrogen in the former was presumed to be contained as solid solution, and that in the latter as both aluminium nitride and titanium nitride. Small amount of nitrogen in Nichrome modified various properties a little : it strengthened the material without decreasing the ductility so much, increased the electrical resistance, decreased a temperature coefficient and increased the expansion coefficient. The limit of nitrogen to obtain the sound alloy safely was presumed to be about 0.055%N. The age-hardening of Nimonic alloys was promoted by a small addition of nitrogen, but decreased by a large addition of it. As the nitrogen content in Nimonic alloys was increased, the alloys tended to show over-aging and to decrease both the high temperature hardness and the creep strength. The function of nitrogen was detrimental to Nimonic alloys. Its vacuum melting was recommended for the purpose of preventing the melt from the contamination by both oxygen and nitrogen.
社団法人日本鉄鋼協会の論文
1959-01-01

Ni-Cr 系合金におよぼす窒素の影響 : 耐熱材料における合金元素としての窒素の作用について I

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