鋼中におけるニオブ炭化物および窒化物の挙動について : ニオブ添加鋼に関する基礎的研究 I

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High purity Fe-Nb-C, Fe-Nb-N and Fe-Nb-C-N alloys containing niobium up to 0.33% were vacuum-melted and cast into 2∿5kg ingots. The metallographic structure was investigated with these specimens which had been prepared from the samples by quenching in water after long-time holding at respective temperatures of 800 to 1250℃. At the same time, the precipitants were isolated from these specimens by 6N-HCl solution and identified by X-ray diffraction method. The quantitative determination of insoluble niobium was also investigated. Results obtained are as follows : 1) The precipitation of niobium-carbonitrides or -carbides is recognized predominantly on austenite grain boundaries as finely dispersed particles, while the niobium-nitrides precipitate as comparatively large particles. 2) The precipitants of niobium-carbides and-carbonitrides in these samples were identified to be f.c.c. δ-phases with somewhat different lattice constants. 3) Two types of hexagonal niobium-nitrides were recognized and identified to be ε-and δ′-phases, the ratio of ε-to δ′-phase seemed to be increased as the ratio of N to Nb in sample was increased. 4) These precipitants can be quantitatively isolated from the iron matrix by dissolving the chips in 6N-HCl solution at room temperature. 5) It is concluded from the results of analysis for insoluble niobium content in each specimen that the precipitation of niobium-carbides, -nitrides and-carbonitrides begins at high temperature such as 1200℃ and is almost completed at about 900℃ in these alloys.
社団法人日本鉄鋼協会の論文
1964-06-01

鋼中におけるニオブ炭化物および窒化物の挙動について : ニオブ添加鋼に関する基礎的研究 I

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