TAILIEUCHUNG - Volume 01 - Properties and Selection Irons, Steels, and High-Performance Alloys Part 10

Tham khảo tài liệu 'volume 01 - properties and selection irons, steels, and high-performance alloys part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Temperature F Average stres for rupture in 10s h ksi Fig. 5 Variation of 105-h creep-rupture strength as a function of temperature for 2 4 Cr-1Mo steel standard 9Cr-1Mo modified 9Cr-1Mo and 304 stainless steel. Source Ref 7 Rupture life 10 000 h loo 000 ti Exposure prior to tẾỊTÍng 10Ũ0 ti None Ử 10 000 h 100 ŨOO h n a o a Fig. 6 Effect of elevated-temperature exposure on stress-rupture behavior of a normalized and tempered 2 1 Cr-1Mo steel and b annealed 9Cr-1Mo steel. Exposure prior to stress-rupture testing was at the indicated 4 test temperatures without stress and was 10 000 h long for the 2 4 Cr-1Mo steel and 100 000 h long for the 9Cr-1Mo steel. n a data not available at indicated exposure and rupture life. Fig. 7 Effect of temperature exposure on the room-temperature properties of a normalized 900 C or 1650 F and tempered 705 C or 1300 F 2 4Cr-1Mo steel after exposure without stress to indicated temperature for 10 000 h and b annealed 9Cr-1Mo steel after exposure without stress to indicated temperatures for 100 000 h The chromium-molybdenum-vanadium steels are manufactured with higher carbon ranges such as to and to and are used in the normalized and tempered or quenched and tempered condition. Because of the relatively high yield strengths Fig. 8 and creep strengths Fig. 3 these steels are suitable for bolts compressor wheels in gas turbines and steam turbine rotors and other parts operating at temperatures up to 540 C 1000 F . The most common low-alloy composition contains 1 Cr 1 Mo and .

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