Dab tsi ntawm cov hlau yog feem ntau cua sov - tsis kam?

Hauv kev siv cov ntawv thov los ntawm Aerospace tshuab rau cov nroj tsuag cog cov tshuab hluav taws xob, muaj peev xwm tiv thaiv lub zog tsis muaj zog yam tsis muaj zog, lossis deforming yog qhov tseem ceeb. Hlau, ib qho alloy ntawm hlau thiab carbon thiab carbon, tuaj yeem txhim kho nrog ntau cov ntsiab lus los txhim kho nws cov cua sov tsis kam, tab sis tsis yog tag nrho cov hlau ua kom sib npaug hauv qhov kub. Thaum ntsuas "tshav kub tiv taus," qhov tseem ceeb ua kom tau cov tshuab tsis muaj zog ntawm kev nce qib siab), thiab zam kev hloov pauv zoo li cov nyom loj los yog theem kev hloov pauv. Ntawm tag nrho cov hlau hom, Austenitic tshav kub {}} Resistant stainless hlau {}}}}}- tiv taus.
Austenitic stainless steels are inherently heat-resistant due to their austenitic crystal structure, which remains stable at high temperatures (unlike ferritic or martensitic steels, whose structures can transform and weaken when heated). Qhov kev sib ntxiv ntawm chromium (feem ntau 16-26%) cov txheej txheem tiv thaiv cov roj chomium, tiv thaiv oxidation txawm nyob rau ntawm 2,100℃f (1,150 degree). Nickel (8-24%) Txav ruaj khov cov qauv Austenic, kom ntseeg tau tus hlau khaws cia thiab lub zog thaum raug cua sov. Cov hauv paus ntsiab lus twb tau outperform hlau hlau cov hlau, uas pib soften saum 600℃f (315 degree) thiab oxidize sai ntawm 1000℃F (538 Degree).
Txhawm rau thawb cov cua sov ua kom tsis kam lees ntxiv, kev nce qib Austenitic cov qib sib xyaw Molybdenum (mo), tungsten (w), thiab niobium (nb). Molybdenum txhim kho siab high - kub lub zog thiab}}}}}} Thaum tungsten txhawb cov creep tsis kam thiab ruaj khov ntawm huab huab cua sov. Niobium cov ntaub ntawv carbides uas tiv thaiv kev cog qoob loo (uas tiv thaiv qoob loo qoob loo (uas tsis muaj zog ntawm cov hlau) thaum rhuab ntev ntev. Ib qho piv txwv ua ntej yog Alloy 310 (uns undal s31000), ib chromium-}}} chromium thiab 19-22% npib tsib. Nws tuaj yeem ua haujlwm txuas ntxiv ntawm qhov kub txog li 2,000℃F (1,150 degree), ua rau nws staple pob, kev hloov pauv kub, thiab kiln cheebtsam.
Rau qhov siab dua siab dua, mob siab rau cov hlau tsis muaj pa nrog ntxiv rau kev cobalvalt lossis tsis tshua muaj neeg nyob hauv lub ntiaj teb. Cov superalloys, feem ntau tau cais raws li "cua sov {{ove {reedant superalty), tuaj yeem tiv thaiv kev pab txuas ntxiv ntawm 2,200-2,400-1℃f (1,200-1,315 degree). Piv txwv li, qee qib ntawm cov qauv sib xyaw ua ke 20-30% npib tsib, 5-10% cobalt, thiab cov kab ntawm lub suab lossis cov nqi. Cobalt pab tau siab siab- kub txheej, thaum tsis tshua muaj adves thiab tiv taus spalling (flaking) thaum lub caij cycling. Cov hlau no tseem ceeb hauv kev siv dav hlau, xws li dav hlau cav sib txuas ua ke, qhov twg kub tshaj F (1,093 degree) rau ncua sij hawm.
Muab piv lwm cov Steel Highlights Vim li cas Austenitic Rhaub - istant stainless hlau sawv tawm. Cov hlau ferritic stainless, nrog 10-20% chromium tab sis me ntsis}} kub lub zog tab sis tsis muaj qhov kub siab dua 1,500℃f (815 degree). Martensitic Stainless hlau, paub txog kev tawv thiab lub zog ntawm chav sov, poob rau feem ntau cov khoom siv hauv qab 1,000 tus degree) thiab ib txwm ua rau oxidation vim yog cov ntsiab lus chromium qis dua. Cov hlau roj carbon steels, txawm siab siab}}}} Cov hom kev sib txawv ntawm 1,28℃f (538 degree) thiab poob℃rau saum 1,200℃f (649 degree).
Lwm qeb, nickel - based supallloys, feem ntau offperform cov hlau hauv ultra {1} high kub, tab sis lawv tsis muaj me ntsis rau tsis muaj hlau). Austenitic tshav kub- tiv taus stainless hlau qhov sib txawv ntawm cov neeg siv hluav taws xob, muab cov haujlwm qub}}}} superalloy ua kom sov.
Cov ntawv thov tseem ceeb ntawm feem ntau cua sov -}} tsis kam ntawm cov hlau tsis muaj xws li:
• Muaj cov tog cua sov: Cov ntaub ntawv hauv cov ntaub pua hauv thiab cov khoom siv cua sov uas ua haujlwm ntawm 1,800-2,200℃f (982-1,204 degree).
• Cov tawv nqaij hauv qab: cov khoom siv zoo li lub teeb lub zuam luam thiab tso manioding, raug rau 1,500-2,000℃f (815-1,093 degree) roj av.
• Kev Lag Luam: Reactors thiab cov piping tuav siab high -} qhov kub thiab cov kab mob oxidation yog qhov tseem ceeb.
• Aerospace: cav qhov chaw thiab cov thermal thaiv npog, xav tau lub zog ntawm 1,800℃f (982 degree) thiab siab dua.
Hauv cov ntsiab lus, feem ntau cua sov {{}} awulated hom hlau yog siab}}} all el} all additionalb {2} xws li molybdenum, tungsten, lossis niobium. Cov hlau no tau khaws lub zog, tiv thaiv oxidation, thiab tswj hwm kev ruaj ntseg f (1,315℃ferritic, martensitic, thiab cov carbon steels. Lawv cov qauv sib xyaw ntawm cov qauv Austenic, oxide txheej tiv thaiv, thiab creep resistance ua rau lawv indispensable nyob rau hauv lub ntiaj teb tshaj plaws high-} kub kev siv kub.