Ukwelashwa Kokushisa Kwemvula Ukwenza Ukusakaza Kwensimbi Engagqwali Okuqinile

I-precipitation hardening (PH) insimbi engagqwali ye-martensitic ngokuvamile iqukethe izakhi zengxubevange njengethusi, umthofu, i-molybdenum, ne-titanium akha isigaba esiqinile. Lezi zakhi ze-alloying zinokuncibilika okukhulu ku-austenite, kodwa kuncane kakhulu ku-martensite. Ngakho-ke, ukwelapha ukushisa kwezulu okwenza lukhuni insimbi engagqwali ye-martensitic kufanele kuqala kube ukwelashwa kwesixazululo okuqinile ukuze kuncibilike ngokugcwele isigaba esiqinile esitholakala kusimo sokusansimbi. Khona-ke ukwelashwa kokuqina kwemvula kuyenziwa ukuze kuncishiswe isigaba sokuqina sesibili, ngaleyo ndlela kuthuthukiswe amandla okusakazwa kwensimbi engagqwali futhi kusenze sibe nokumelana nokugqwala okuhle. Ngaphezu kwalokho, ukwelashwa kwesixazululo kuzophinde kuthuthukise ukusebenza kokusika kweimvula iqinisa insimbi engagqwali.

Izici Zokwelashwa Kokushisa Kwemvula Ukuqinisa Ukusakaza Kwensimbi Engagqwali:

• I-1) Ngaphambi kokwelashwa kwesixazululo, idinga ukushisisa ku-650 ℃, bese ishisiswa ngokushesha ekushiseni okunqunywe kusengaphambili. Ama-castings nawo angalayishwa eziko emazingeni okushisa aphezulu.
• 2) Izinga lokushisa lesixazululo esiqinile livamise ukuba ngu-1020-1060°C, futhi isikhathi sokubamba sibalwa ngokuvumelana nokwanda okuhambisanayo kwehora elingu-1 njalo ngo-25 mm ukwanda kodonga. Ngokulingisa okunobumo obuyinkimbinkimbi, izinga lokushisa lesixazululo esiqinile lingancishiswa libe cishe ku-930°C.
• I-3) Ukuze kuqedwe ukungafani kokungafani kwesakhiwo se-dendritic kanye nokuhlukaniswa kwengxenye ekufakweni okukhulu kwensimbi, kungcono ukwenza ukwelashwa kwe-homogenization yokushisa okuphezulu ngaphambi kwesisombululo esiqinile.
• I-4) Izinga lokushisa lokwelashwa kokuguga lingakhethwa ngokufanele ngokuvumelana nezidingo zamandla, ubulukhuni kanye nokuqina kokubunjwa.
• 5) Ukuze kuthuthukiswe izakhiwo zemishini yemvula eqinisa insimbi engenasici, ngemva kokwelashwa kwesixazululo, ukupholisa umoya ku-700-810 ° C amahora angu-2, bese kubanda komoya ku-620 ° C amahora angu-4. Lokhu kungathuthukisa kakhulu ukusebenza kokusika kwama-castings.