オーステナイト系耐熱鋼の熱疲労特性(<特集>ステンレス鋼)

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Thermal fatigue properties of a number of austenitic heat resisting steels have been studied by using a testing equipment that can either strain and temperature cyclings independently. The microstructural and fractographical studies have also made. The results are as follows : (1) Under 200/1000℃ temperature cycling, R2(19Cr-15Ni-3Si-Al) has slightly better thermal fatigue life(N_f) than SUS310S and Rl(19Cr-13Ni-3Si-Nb). Under 200/800℃ and 200/700℃ temperature cyclings, the order of steels in N_f changes with the change in total strain range (⊿ε_t). That is, SUS304 has a better thermal fatigue life than the others when ⊿ε_t is in a higher value, but than the others when ⊿ε_t is a lower level. (2) Under 200/1000℃ temperature cycling, the ductility of steels principally contributes to N_f. On the other hand under 200/800℃ and 200/700℃ temperature cyclings, the ductility of steels greatly contributes to N_f when ⊿ε_t is in a higher level, and the strength of steels during thermal fatigue test greatly contributes to N_f when ⊿ε_t is in a lower value. (3) The cracks in the steels tested under 200/800℃ and 200/700℃ temperature cyclings are generally transgranular, and the fracture surfaces reveal striations. In SUS310S, however, which has much precipitation near the grain boundary, the most cracks propagate along the grain boundary. Thus, it is understood that the structural change during thermal fatigue test has a large influence on the thermal fatigue properties.
1977-04-01

オーステナイト系耐熱鋼の熱疲労特性(<特集>ステンレス鋼)

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