1. Dab tsi yog qhov tseem ceeb ntawm kev sib txawv ntawm cov khoom siv dag zog thiab lub hauv paus muaj pes tsawg leeg ntawm A-286, Alloy 330, thiab cov hlau Incoloy zoo li 800H?
Qhov sib txawv tseem ceeb nyob hauv lawv tsev neeg alloy thiab thawj txoj kev ntxiv dag zog, uas txiav txim siab lawv lub hnab ntawv ua haujlwm.
A-286 (UNS S66286): Qhov no yog nag lossis daus-hardenable, hlau-base superalloy. Nws cov matrix yog hlau (Fe-25Ni-15Cr), tab sis nws muaj lub siab xav ntxiv ntawm titanium (Ti ~ 2.0%), txhuas (Al ~ 0.2%), thiab molybdenum (Mo ~ 1.2%). Cov ntsiab lus no tsim cov coherent intermetallic precipitate Ni₃ (Ti, Al) (gamma prime, γ ') thaum lub sij hawm kev kho cua sov tshwj xeeb (feem ntau 1300-1400 ° F / 704-760 ° C rau 16 teev). Cov nag lossis daus no ua rau A-286 nws qhov tshwj xeeb ntawm qhov kub thiab txias tsis kam, uas tsis tuaj yeem ua tiav los ntawm kev ua haujlwm tawv ib leeg.
Alloy 330 (UNS N08330): Qhov no yog ib qho khoom - kev daws teeb meem, npib tsib xee- hlau- chromium austenitic alloy. Nws tso siab rau kev tawg ntawm nws cov ntsiab lus alloying tseem ceeb- tshwj xeeb yog cov ntsiab lus chromium siab (18-20%) thiab nickel ntau heev (34-37%)- mus rau hauv austenitic matrix kom ntxiv dag zog rau nws. Nws tsis muaj lub siab xav los nag-ua kom tawv zoo li Ti lossis Al. Nws lub zog yog muab los ntawm cov khoom tsim los ntawm cov khoom siv tshuaj thiab tuaj yeem ua kom muaj zog los ntawm kev ua haujlwm txias. Nws lub hom phiaj tsim yog nyob rau hauv high-temperature stability thiab nto tiv thaiv, tsis ncov txhua yam muaj zog.
Incoloy 800H (UNS N08810): Zoo li 330, Incoloy 800H yog ib qho khoom siv -kev daws teeb meem, npib tsib xee- hlau-chromium alloy. Txawm li cas los xij, nws tau raug tsim ua tiav rau kev ua haujlwm siab - qhov kub thiab txias los ntawm kev tswj chemistry (0.05-0.10% C, Ti/Al piv) thiab yuav tsum tau ntxhib- nplej anneal. Nws lub zog yog los ntawm cov khoom sib tov thiab ruaj khov, coarse grain qauv. Piv rau A-286, nws muaj zog qis dua tab sis zoo dua ductility thiab thermal stability nyob rau lub sij hawm ntev heev ntawm qhov kub thiab txias. Piv nrog rau Alloy 330, nws muaj kev sib tw zoo tshaj plaws rau kev siv cov khoom siv thauj khoom.
2. Rau qhov siab - kub tivthaiv uas yuav tsum tau muaj zog thiab corrosion kuj, xws li roj turbine cav ntsia liaj qhov rooj los yog lub cub tawg fixture, cov txheej txheem xaiv qhov txawv ntawm A-286 thiab Alloy 330 / Incoloy 800H?
Kev xaiv yog tswj hwm los ntawm thawj hom tsis ua haujlwm thiab kev tswj hwm kub.
Xaiv A-286 thaum: Tus tsim qauv tsav tsheb yog siab tensile thiab creep zog nyob rau hauv qhov tseem ceeb load ntawm kub txog li ~ 700 ° C (1300 ° F). A-286 qhov tawm los thiab nkag siab lub zog ntawm qhov kub thiab txias tshaj li cov khoom siv tshuaj daws teeb meem. Nws yog cov khoom siv tseem ceeb rau kev ntxhov siab (bolts, studs), turbine cav Cheebtsam, thiab cov qauv kev ntxhov siab siab hauv aerospace thiab lub zog tsim. Nws corrosion kuj (zoo oxidation tsis kam mus txog ~ 1300 ° F) yog qhov thib ob rau nws cov khoom siv kho tshuab.
Xaiv Alloy 330 los yog Incoloy 800H thaum: Tus thawj tsav tsheb yog kev tiv thaiv ib puag ncig degradation (oxidation, carburization, thermal cycling) ntawm qhov kub thiab txias, feem ntau muaj kev ntxhov siab me ntsis. Lawv raug xaiv rau lub cub tawg radiant tubes, retorts, baskets, thiab kho cua sov fixtures qhov twg raug rau 1000-1150 ° C yog ntau. Incoloy 800H yuav raug xaiv ntau dua 330 thaum cov khoom siv muaj cov khoom siv ntau dua (piv txwv li, lub raj radiant nyob rau hauv nws tus kheej qhov hnyav thiab sab hauv siab), raws li nws cov ntaub ntawv creep rupture yog superior.
Txoj cai ntawm tus ntiv tes xoo: Siv A-286 raulub zog - txwvtsim thiab Alloy 330/800H rauib puag ncig- txwvtsim ntawm qhov kub thiab txias.
3. Hais txog kev tsim thiab kev vuam, qhov tseem ceeb, kev coj ua txawv txawv rau A-286 yog dab tsi piv rau cov khoom sib tov zoo li 330 thiab Incoloy 800H?
Qhov xav tau rau ib qho kev tshaj tawm tshwj xeeb -kev kho cua sov ua kom tiav cov khoom txhais cov haujlwm ua haujlwm rau A-286.
A-286 Fabrication: Cheebtsam yog machined los yog tsim nyob rau hauv cov kev daws teeb meem -annealed mob (feem ntau 1800 ° F / 982 ° C, ceev txias), uas yog ib tug mos mos, ductile xeev. Txhua qhov vuam yuav tsum ua kom tiav hauv qhov xwm txheej no. Tom qab tag nrho cov fabrication thiab vuam tiav lawm, tag nrho cov tivthaiv yuav tsum tau ib tug meej kev laus kho cua sov (xws li, 1325 ° F / 718 ° C rau 16 teev, cua txias). Qhov kev laus no precipitates γ 'theem, hloov qhov mus rau nws qhov kawg siab -lub zog lub xeev. Vuam tom qab kev laus raug txwv nruj, raws li nws yuav yaj cov nag lossis daus hauv tshav kub- thaj chaw cuam tshuam (HAZ), tsim kom muaj thaj chaw mos, tsis muaj zog uas tsis tuaj yeem rov ua dua- laus hauv zos yam tsis muaj hnub nyoog dhau ntawm qhov seem.
Alloy 330 & Incoloy 800H Fabrication: Cov no yog siv nyob rau hauv cov tshuaj -annealed xeev. Vuam tuaj yeem ua tau txhua lub sijhawm uas siv qhov sib txuam lossis ntau dua -cov hlau muab tub lim (piv txwv li, ENiCrFe-2 rau 330, ERNiCr-3 lossis ERNiCrCoMo-1 rau 800H). Rau 800H, cov tshuaj tom qab vuam anneal feem ntau pom zoo rau qhov kev pabcuam kub kub tseem ceeb los kho cov khoom zoo. Tsis muaj nag lossis daus-tawv tawv kho kev laus. Lawv cov khoom tseem ceeb yog kho los ntawm lub zeb anneal thiab tsuas yog hloov tau los ntawm kev ua haujlwm txias lossis cov teebmeem thermal ntawm vuam.
4. Xav txog kev tiv thaiv aqueous corrosion, xws li hauv kev ua tshuaj, qhov twg Incoloy 825, Alloy 330, thiab A-286 qib, thiab dab tsi yog lub hauv paus kev rau qhov qeb duas?
Qhov xwm txheej no qhia txog qhov tseeb hierarchy raws li alloy chemistry tsim los rau corrosion.
Incoloy 825 (UNS N08825) yog qhov kev xaiv zoo tshaj plaws. Nws yog tsim tshwj xeeb rau aqueous corrosion nrog ib tug muaj pes tsawg leeg (Ni-42, Cr-21, Mo-3, Cu-2) uas lub hom phiaj tiv thaiv kom txhob acids (H₂SO₄, H₃PO₄) ntawm tooj liab, chloride pitting thiab kev nyuaj siab corrosion tawg ntawm molybdenum thiab npib tsib xee, thiab oxidizing xov xwm ntawm chromium. Nws yog lub chaw ua haujlwm rau cov khoom siv hluav taws xob, cov kav dej, thiab cov hlab ntsha hauv sulfuric acid, phosphoric acid, thiab seawater service.
Alloy 330 muaj kev txwv aqueous corrosion kuj. Nws cov nickel siab thiab chromium muab kev tiv thaiv zoo rau nitric acid thiab cov ntsev yooj yim, tab sis nws tsis muaj molybdenum (Mo) ua rau nws muaj kev cuam tshuam rau pitting thiab crevice corrosion nyob rau hauv ib puag ncig chloride (xws li dej hiav txwv, dej brackish). Nws tsis yog ib qho khoom pom zoo rau kev pabcuam ntub dej.
A -286 yog qhov tsim nyog tsawg kawg nkaus. Thaum nws muaj oxidation zoo, nws cov aqueous corrosion kuj zoo ib yam li cov qauv stainless hlau. Nws yog qhov yooj yim rau chloride-induced pitting thiab stress corrosion cracking. Nws siv yuav luag tsuas yog nyob rau hauv siab -lub zog, siab kub daim ntaub ntawv, tsis corrosive tshuaj ib puag ncig.
5. Dab tsi yog qhov tseem ceeb ntawm ASTM / ASME cov qauv kev qhia tshwj xeeb rau kev yuav khoom, thiab cov ntaub ntawv tseem ceeb dab tsi yuav tsum muaj Daim Ntawv Pov Thawj Mill Test muaj rau txhua qhov ntawm cov hlau no kom ntseeg tau tias qhov zoo rau siab - qhov kev pabcuam kub?
Kev yuav cov alloys no rau kev cai- cov haujlwm ua raws (xws li ASME Boiler thiab Pressure Vessel Code) yuav tsum ua raws li cov qauv tshwj xeeb.
A-286: Tus qauv tseem ceeb yog ASTM A453 / ASME SA453 Qib 660 rau bolting, thiab ASTM A638 / ASME SA638 Qib 660 rau phaj, bar, thiab forging. MTC yuav tsum tau lees paub chemistry, chav-kub txhua yam khoom, thiab qhov tseem ceeb tshaj plaws, cov txiaj ntsig ntawm kev kho cua sov uas yuav tsum tau ua thiab tom qab siab-kub tensile lossis kev ntxhov siab-rupture tests los ua pov thawj cov khoom ua tau raws li qhov ntsuas kub siab zog guarantees.
Alloy 330: Tswj los ntawm ASTM B536 / ASME SB536 rau phaj, ntawv, thiab sawb. MTC yuav tsum txheeb xyuas chemistry (tshwj xeeb yog Ni, Cr, Si) thiab chav -kub tshuab. Rau siab -kub siv, ntawv pov thawj ntawm cov tshuaj anneal mob yog qhov tseem ceeb.
Incoloy 800H: Tswj los ntawm ASTM B409 / ASME SB409 rau phaj, ntawv, thiab sawb. MTC yog qhov txawv ntawm tus qauv 800; nws yuav tsum ua pov thawj "H" qib yuav tsum tau: cov ntsiab lus carbon (0.05-0.10%), ntawv pov thawj coarse grain loj (ASTM No. 5 los yog coarser), thiab cov ntaub ntawv ntawm high -kub tshuaj anneal. Cov ntaub ntawv no tsis yog sib tham tau los xyuas kom meej qhov kev cog lus creep kev ua tau zoo.
💎 Summary and Selection Guide
| Alloy | Core Strength | Thawj Daim Ntawv Thov Realm | Kev Xaiv Ntsiab Cai | Crucial Fabrication Note |
|---|---|---|---|---|
| A-286 | Cov nag lossis daus hardening (γ ') | Siab -Ntev lub zog, Turbine Parts | "Peb xav tau lub ntsia liaj qhov rooj uas yuav tsis ncab lossis tawg ntawm 650 ° C." | Weld ua ntej hnub nyoog kawg. Tsis txhob welded cov khoom qub. |
| Alloy 330 | Kev daws teeb meem & Oxidation | Unloaded rauv qhov chaw, Oxidation hnyav | "Peb xav tau lub raj radiant rau 1150 ° C carburizing cua." | Zoo weldability, tsis muaj theem transformation. |
| Incoloy 800 H | Solid Solution & Creep Repture | Loaded High -Tsem Cheebtsam (Tubes, Piping) | "Peb xav tau lub raj hloov kho uas yuav tsum tuav lub siab ntawm 900 ° C rau xyoo." | Xyuas kom MTC lees paub qib "H" (C%, Grain Size). |
| lus 825 | Aqueous Corrosion Resistance | Acid & Chloride Chemical Processing | "Peb xav tau lub tshav kub exchanger rau sulfuric acid nrog chloride paug." | Siv Mo-nplua nuj muab tub lim (piv txwv li, 625) rau vuam. |
Kuv vam tias qhov kev sib piv ntxaws no yuav pab tau rau hauv koj cov txheej txheem xaiv cov khoom. Yog tias koj muaj ib qho kev thov tshwj xeeb hauv siab (xws li, qhov kub thiab txias, kev ntxhov siab, qhov nruab nrab corrosive), kuv tuaj yeem muab kev taw qhia ntau dua rau qhov twg ntawm cov alloys no yog qhov tsim nyog tshaj.
