高炭素鋼の黒鉛化におよぼす Al および N の影響について(その 1) : 高炭素鋼の黒鉛化に関する研究 II

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The authors studied on the effect of aluminum and nitrogen on the graphitization of fine high-carbon steel. Results obtained were as follows : (1) The presence of acid soluble aluminum had a promoting effect on graphitization. When the high carbon steel were made from electrolytic iron, the graphitization at 650℃ after water quenching from 870℃ were very markedly accelerated as the acid-soluble aluminum increased up to 0.04%, and the graphitization after cold drawing from 10φ to 8φ were also accelerated as the acid-soluble aluminum increased up to 0.06%. (2) The nitrogen in solution calculated from total nitrogen, total aluminum, and solubility product for ALN inhibited the breakdown of cementite to graphite after water-quenching from 870℃. (3) High-carbon steel made from electrolytic iron had a reduced tendency to graphitization at 650℃ after air-cooling from 870℃ and furnace-cooling from 770℃ compared with after water quenching, but this rate of graphitization increased with acid-soluble aluminum up to 0.08%. (4) The carbide stable rim was noted when austenitizing was carried out in NaCN-BaCl_2 salt, and the rim thickness increased with austenitizing time. (5) Nitrogen dissolved in aluminum-killed high-carbon steel inhibited graphitization after water-quenching, but nitrogen over 0.03% did not produce inhibiting effect on graphitization after cold drawing.
社団法人日本鉄鋼協会の論文
1959-02-10