Official Answer
Answer
17-7PH (Nau'in 631) bakin karfe yana cimma kaddarorinsa ta hanyar haɗin rage sanyi da taurin hazo. Lokacin zayyana don yanayin zafi mai zafi, annashuwa ko 'saitin' yanayin maganin zafi yana tasiri (misali, CH900). An ƙirƙira annashuwa ta ma'aunin Arrhenius inda adadin creep ya kasance $\epsilon = A \sigma^n e^{-Q/RT}$. Don lokacin bazara, damuwa $ \ sigma$ dole ne a kiyaye shi ƙasa da 75% na ƙaramin ƙarfi na yanayin CH900 ($210-240$ ksi) don rage saiti na dindindin. Idan zafin aiki ya wuce $650^{\circ}F$ ($ 343 ^{\circ}C$), kayan yana fuskantar babban hasara na modules na roba, kuma ƙirar dole ne a lalata shi da kusan 5-10% don lissafin shakatawa na thermal.
