Answer
17-7 PH (AISI 631) wani Semi-austenitic hazo-hardening bakin karfe wanda aka zaba don yawan ƙarfin gajiya da juriya na lalata.
Tsarin Sarrafa da Karfe:
1. Iskar sanyi (Sharadi C): Ana jujjuya waya mai lebur kuma ana murɗe sanyi daga yanayin da aka rufe. Ragewar sanyi yana samun nakasu mai tsanani, yana canza matrix austenite zuwa babban ƙarfin sanyi mai aikin martensite.
2. Maganin zafi / Tsufa (Yanayin CH900): Bayan kafa igiyar ruwa, sassan suna fuskantar tsufa na thermal a $900^\circ F$ ($ 482 ^\circ C $) na awa 1, sannan sanyaya iska.
3. Hazo Hardening: A wannan zafin jiki na tsufa, ƙananan mahadi masu tsaka-tsaki na Aluminum ($ Ni_3Al$) suna hazo a cikin matrix na martensitic. Wannan yana taƙaita motsin karkacewa kuma yana haɓaka ƙarfin amfanin gona har zuwa $1700\rubutu{MPa}$ da ƙarfin ɗaure har zuwa $1900\rubutu{MPa}$.
4. Tsawon Girma: Matsakaicin jiyya na CH900-yana kawar da bazara mai sanyi yayin inganta iyakoki na gajiya da rage juzu'i mai girma a cikin hawan keken aiki.
