Effects of Heat Treatment on the Mechanical Properties of Carbon Tool Steels
抄録
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.
炭素工具鋼の機械的性質に及ぼす熱処理の影響
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