17Cr-7Ni ステンレス鋼の組織, Ms 点および機械的性質に及ぼす Al と C 含有量の影響について(<特集>ステンレス鋼)

概要

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In order to make clear the roles of Al and C in 17 Cr-7Ni stainless steel, the microstructural features, Ms temperature, and mechanical properties were investigated for the steels containing variable amounts of Al and C. The results obtained are as follows : (1) The quantity of δ-ferrite in matrix increased with the increase of Al content, or the decrease of C content. No δ-ferrite is observed in the range of Al content less than about 0.7%, but the phase of δ-ferrite is nearly 10 and 50% in matrix for steels containing about 1 and 2% Al, respectively. Furthermore, for the steels containing about 0.01 and 0.07%C, the phase of δ-ferrite exists in 45 and 10% in matrix, respectively. And also when C content in steel is more than 1%, the δ-ferrite can not be observed. (2) According to our experiments, it seems that the Ms temperature is raised in rate of 20℃ per 1% Al, and is dropped down about 14℃ per 0.01%C in content. (3) It is confirmed that the microstructural features and the Ms temperature are affected sensitively with Al and C content. (4) The best mechanical properties is obtained for the steel containing about 1.2% Al and 0.07% C. Also it can be recognized that the age hardenability are increased with the increase of Al content, and with the decrease of C content.
社団法人日本鉄鋼協会の論文
1977-04-01