炭素工具鋼の機械的性質に及ぼす熱処理の影響

概要

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Each of seven carbon tool steels (SK1 to SK7) was heated for two hours at two kinds of austenitizing temperatures, which is 30℃ to 50℃ above the A_3-temperature or the A_cm-temperature and 37℃ above the A_1-temperature (760℃), as determined from the iron-carbon phase diagram, and was cooled by the three different methods, that is, oil-quenching, air-cooling and furnace-cooling. The following results were obtained by the tensile test. The tensile strength was higher within the hypoeutectoid composition, as quenched into oil from the austenitizing temperatures of 30℃ to 50℃ above the A_3-temperature or the A_cm-temperature, but decreased markedly with increasing carbon content in the range of hypereutectoid composition. The maximum tensile strength as quenched into oil from 760℃ was lower compared with the maximum tensile strength as quenched into oil from the full austenitizing temperatures.
長野工業高等専門学校の論文