Thaum tshav kub kub resistant steel
Thaum tshav kub kub-resistant steel hais txog cov hlau alloy tshwj xeeb uas muaj tshuaj lom neeg ruaj khov thiab lub zog siab ntawm qhov kub thiab txias, thiab tuaj yeem hloov kho kom zoo rau qhov kub thiab txias. Feem ntau yog siv rau kev tsim cov cua kub cua sov, lub tshuab hluav taws xob sab hauv, roj av thiab tshuaj siv tshuab thiab khoom siv thiab lwm yam kev kub ntxhov ua haujlwm.
(1) Lub tswv yim ntawm tshav kub tsis kam
Lub tshav kub tsis kam ntawm cov hlau muaj xws li thermochemical stability thiab kub siab zog.
Thermochemical stability yog hais txog lub peev xwm ntawm cov hlau los tiv thaiv cov tshuaj corrosion ntawm ntau yam xov xwm ntawm qhov kub thiab txias, uas yog qhov yooj yim tshaj plaws thiab qhov tseem ceeb tshaj plaws yog oxidation tsis kam. Lub thermal stability feem ntau yog txiav txim los ntawm cov tshuaj muaj pes tsawg leeg ntawm cov hlau. Ntxiv rau tib neeg Cr, Al thiab Si rau lub peev xwm antioxidant, vim tias Cr, Al thiab Si tuaj yeem tsim kev sib cog lus thiab tiv thaiv Cr nrog oxygen thaum oxidized ntawm qhov kub thiab txias.2O3,A12O3tej zaum SiO2zaj duab xis. Cr yog qhov nyiam cov khoom siv hlau. Thaum cov hlau WCr 15 feem pua, qhov kub ntawm cov hlau tuaj yeem ncav cuag 900 degree; Thaum WCr 20 feem pua ~ 25 feem pua, cov tshuaj tiv thaiv kab mob ntawm cov hlau tuaj yeem ncav cuag 1100 degree. Tsis tshua muaj lub ntiaj teb (ib qho me me ntawm yttrium, cerium, thiab lwm yam) cov ntsiab lus tseem tuaj yeem txhim kho cov cua sov tiv thaiv hlau oxidation. Qhov no feem ntau yog los ntawm kev txhim kho cov tshuaj tiv thaiv antioxidant ntawm oxide zaj duab xis, tab sis kuj tuaj yeem txhim kho lub zog khi ntawm oxide zaj duab xis thiab cov hlau nto. Nyob rau saum npoo ntawm steel seepage aluminium, silicon los yog chromium aluminium, chromium thiab silicon co-seepage muaj peev xwm tseem ceeb antioxidant.
Lub zog kub kub yog hais txog lub peev xwm ntawm cov hlau los tiv thaiv cov yas deformation thiab tawg ntawm qhov kub thiab txias. Kev txwv tsis pub nkag thiab lub zog tsis tu ncua yog feem ntau siv los ntsuas. Los ntawm kev ntxiv Cr, Ni, W, Mo thiab lwm yam ntsiab lus, ntxiv dag zog rau lub matrix, txhim kho qhov kub thiab txias recrystallization thiab ua rau kom ruaj khov ntawm matrix; ntxiv V, Ti, Nb, Al thiab lwm yam, tsim cov carbide nrog siab hardness thiab zoo thermal stability, tiv thaiv kev loj hlob ntawm creep thiab dispersion; kab B thiab tsawg lub ntiaj teb (RE) cov ntsiab lus thiab txhim kho qhov kub thiab txias ntawm cov hlau.
