Ubuchwepheshe obusha be-metallurgical

Corrosion ukumelana steel ingxubevange ukwelashwa kokushisa okuyinhloko kuvimbela:

• 1) Ukuqeda ukwelashwa nokushisa. Ngokuyinhloko ukuthola i-martensite nokuvimbela imvula ye-carbide; ukucima nokushisa ukuqeda ukucindezeleka nokucima ubunzima.
• 2) Ukujwayela + okujwayelekile Insimbi ephansi yekhabhoni yokulwa nokugqwala equkethe inani elincane le-nickel, i-molybdenum, i-silicon nezinye izinto, ngemuva kokujwayela + ukwelashwa okunamandla, izakhiwo zemishini ziyathuthukiswa.

Insimbi emelana nokugqwala kweFerritic, lolu hlobo lwensimbi lunama-w (C) ≤ 0.12% no-w (Cr) phakathi kuka-15-20%. Main izindlela ukwelashwa ukushisa:

• 1) njenge-cast;
• 2) Ukuncishiswa. Izinga lokushisa elingenayo akufanele libe ngaphansi kuka-540 ° C, noma libe ngaphezu kuka-850 ° C.

Ngesikhathi senqubo yokushisa, lapho izinga lokushisa lifinyelela kuma-350 ° C, kusetshenziswa ukushisa kokugcina isikhathi esithile ukugwema ukucindezeleka okukhulu ekusakazweni.

Insimbi emelana nokugqwala kwe-Austenitic, Ibanga lensimbi elijwayelekile lingu-1Cr18Ni9Ti. Main izindlela ukwelashwa ukushisa:

• 1) Isixazululo esiqinile. Ukusakazwa kufudunyezelwa ku-950-1175 ° C, futhi kungakuhle ukwamukela inqubo yokufudumeza izinga lokushisa okuphansi bese ukufudumeza ngokushesha kusilinganiso sokushisa kwesixazululo.
• 2) Isixazululo esiqinile + ukwelashwa kokuqiniswa. Ngemuva kokwelashwa kwesixazululo esiqinile kwento ye-alloy efana ne-titanium bismuth, kufanele iqiniswe futhi. Okusho ukuthi, ukusakaza kufakwa kabusha ku-850-930 ° C bese kupholiswa ngokushesha. Ukuze uvimbele imvula ye-chromium carbide, yenza ngcono ukumelana nokugqwala kwe-intergranular.

Ukwehlisa ukuqina kwensimbi emelana nokugqwala, Ibanga lensimbi elijwayelekile yi-ZGCr17Ni4Cu2. Indlela yokwelashwa kokushisa yisixazululo esiqinile + ukuqiniswa kokuguga, izinga lokushisa lesixazululo lingu-1020-1060 ° C, kanti izinga lokushisa elenza iminyaka ibe ngu-560-650 ° C.

Insimbi emelana nokugqwala, Insimbi emelana nokugqwala engagqwala uqukethe into eyodwa efana ne-silicon, i-aluminium, i-chromium, i-nickel noma isakhi esiyinhlanganisela esakhiwe yizo. Ukuze kuthuthukiswe ukwenziwa okuphelele kwemishini, izinto ezifakwayo ezifana nethusi nomhlaba ongajwayelekile zivame ukungezwa, futhi izinto ezinjalo ziyizinto ezilukhuni futhi ezingamelana nokugqwala. Indlela yokwelapha ukushisa ukuqeda ukucindezeleka kwangaphakathi nokuncishiswa kokushisa okuphansi.

Xhumanisa nale ndatshana: Ubuchwepheshe Metallurgical ukugqwala ukumelana steel ingxubevange castings

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