tailieunhanh - Steel Heat Treatment - Metallurgy and Technologies 2nd ed - G. Totten (CRC_ 2010) WW Part 7

Tham khảo tài liệu 'steel heat treatment - metallurgy and technologies 2nd ed - g. totten (crc_ 2010) ww part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | m c ZE 130 70 110 90 0 50 100 150 200 Time h FIGURE Hardness of an unalloyed steel with C after soft annealing depending on the spheroidization time and temperature. From . Eckstein Ed. Technologic der Warmebehandlung von Stahl 2nd ed. VEB Deutscher Verlag fur Grundstoffindustrie Leipzig 1987. For medium-alloy steels up to 630 C 1166 F with a cooling rate of 15-20 K h furnace cooling For high-alloy steels up to 600 C 1112 F with a cooling rate of 10-15 K h furnace cooling Further cooling below the temperatures indicated is usually performed in air Recrystallization Annealing Recrystallization annealing is an annealing process at temperatures above the recrystallization temperature of the cold-worked material without phase transformation that aims at regeneration of properties and changes in the structure that exists after a cold-forming process Tensile strength Rm N mm2 FIGURE Influence of the ultimate tensile strength and degree of spheroidization on machinability of steels for carburizing and structural steels for hardening and tempering expressed as 1 h turning speed v60 in m min. a Spheroidization degree less than 30 b spheroidization degree between 40 and 60 c spheroidization degree greater than 70 . From G. Spur and T. Stol erle Eds. Handbuch der Fertigungstechnik Vol. 4 2 Warmebehandeln Carl Hanser Munich 1987. 2006 by Taylor Francis Group LLC. m c ZE 130 70 110 90 0 50 100 150 200 Time h FIGURE Hardness of an unalloyed steel with C after soft annealing depending on the spheroidization time and temperature. From . Eckstein Ed. Technologic der Warmebehandlung von Stahl 2nd ed. VEB Deutscher Verlag fur Grundstoffindustrie Leipzig 1987. For medium-alloy steels up to 630 C 1166 F with a cooling rate of 15-20 K h furnace cooling For high-alloy steels up to 600 C 1112 F with a cooling rate of 10-15 K h furnace cooling Further cooling below the temperatures indicated is usually performed in air Recrystallization Annealing