高速度鋼の熱処理硬度におよぼす炭素の影響
1954 年 18 巻 7 号 p. 401-405
詳細
1954 年 18 巻 7 号 p. 401-405
Quenched and tempered hardness, micro-structure and grain size of the high speed steel (16-4-1 type) were studied. The carbon content of the specimen varied from 0.63 to 0.92%. The specimens were oil-quenched after heating for 1 min, at various temperatures from 1260 to 1290°. From this research, the following results were obtained.
1. The quenched hardness is lower, as the carbon content of the steel is higher, and as the quenched temperature is higher. 2. The tempering temperature, at which the steel gains the highest secondary hardness, is higher as the carbon content is higher and as the quenched temperature is hgher. 3. High speed steel partially melts above 1270° when the carbon content is 0.90%. 4. All specimens quenched at the same temperature gain nearly the same hardness when the specimen is tempered at a special temperature.
