Q1: Nyob rau hauv toj roob hauv pes ntawm hlau-nickel raws li superalloys, Alloy 901 (AMS 5661) nyob qhov twg nws tus kheej muab piv rau ntau nto moo alloys xws li Inconel 718, thiab dab tsi yog lub hom phiaj tsim thawj rau cov khoom no?
A: Alloy 901 (UNS N09901) occupies ib tug tshwj xeeb thiab tseem ceeb niche nyob rau hauv lub superalloy tsev neeg: nws yog ib tug hlau -nickel raws li superalloy tsim rau nruab nrab- mus rau - kub kev pab cuam, feem ntau nyob rau hauv cov roj turbine Cheebtsam. Nws txoj kev loj hlob predates thiab ntxiv rau qhov ntau ubiquitous Inconel 718.
Compositional Positioning:
Hlau-Nickel Base: Alloy 901 feem ntau muaj kwv yees li 40-45% Nickel thiab 30-35% Hlau. Cov ntsiab lus hlau siab no ua rau nws tsis tshua kim dua li cobalt-based lossis high-nickel superalloys xws li Waspaloy lossis Rene 41.
Cov nag lossis daus Hardeners: Nws siv Titanium (2.5-3.0%) thiab Aluminium (<0.3%) to form the primary strengthening phase, Gamma Prime (γ') - Ni₃(Ti, Al). It also contains Molybdenum (5.0-7.0%) for solid solution strengthening.
Lub hom phiaj tsim:
Alloy 901 yog Ameslikas tsim rau cov roj turbine Cheebtsam ua haujlwm nyob rau hauv qhov kub ntawm 425 txog 760℃(800℃F txog 1400℃F). Qhov no yog qhov "kub seem" tab sis tsis yog qhov kawg combustion tsam.
Sib piv rau Inconel 718:
718 (AMS 5596/5662): Siv Niobium ua nws qhov tseem ceeb ntxiv dag zog rau Gamma Ob Chav Prime ('). Nws muaj lub zog zoo heev txog li 650℃thiab muaj npe nrov rau nws cov weldability.
901 (AMS 5661): Cia siab rau Titanium rau Gamma Prime ntxiv dag zog. Nws tuav lub zog muaj txiaj ntsig rau qhov kub siab dua me ntsis (txog ~ 760 degree) dua li 718, tab sis nws feem ntau suav hais tias nyuaj dua rau vuam vim nws cov ntsiab lus Titanium siab thiab ua rau muaj kev cuam tshuam rau- hnub nyoog tawg.
Hauv luv luv, yog tias tus neeg tsim khoom xav tau tus nqi - siv tau zoo, siab - cov khoom siv zog rau lub tshuab turbine disc, ncej, lossis casing ua haujlwm nyob rau sab sauv - nruab nrab qhov kub thiab txias, Alloy 901 yog qhov kev xaiv classic thiab txhim khu kev qha.
Q2: AMS 5661 specification npog cov ntawv, phaj, thiab ntau yam khoom siv. Dab tsi yog cov teeb meem tshwj xeeb hauv dov Alloy 901 rau hauv daim ntawv nyias, thiab qhov no cuam tshuam li cas rau cov saw hlau thiab khoom siv?
A: Rolling Alloy 901 rau hauv daim ntawv nyias (raws li tau teev tseg hauv AMS 5661) yog qhov nyuaj dua li dov cov qauv austenitic stainless hlau lossis txawm tias Alloy 718. Qhov nyuaj no cuam tshuam ncaj qha rau cov sij hawm txhuas, qhov tsawg kawg nkaus txiav txim kom muaj nuj nqis, thiab tus nqi.
Kev Sib Tw Metallurgical:
High Flow Stress: Alloy 901 muaj zog heev thaum kub ua hauj lwm kub. Qhov no txhais tau tias nws yuav tsum muaj lub zog loj dov zeb los txo cov thickness. Cov khoom tiv thaiv deformation, muab kev ntxhov siab tseem ceeb ntawm cov khoom siv dov.
Cov Qhov rai Kub Kub Ua Haujlwm: Qhov kub thiab txias qhov twg Alloy 901 tuaj yeem ua tiav kub dov yog qhov nqaim thiab yuav tsum tau tswj kom meej.
Txias txias heev: Cov khoom siv ua haujlwm hnyav sai thiab tuaj yeem tawg lossis tsim kua muag ntug.
Kub dhau: Cov khoom tuaj yeem ua rau kub dhau, ua rau cov qoob loo ciam teb lossis cov khoom tawg, uas ua rau lub microstructure puas thiab ua rau daim ntawv tsis haum rau AMS 5661 ntawv pov thawj.
Deg mob: Thaum lub sij hawm dov, lub alloy tsim ib tenacious oxide nplai. Yog tias qhov ntsuas no tau dov rau hauv qhov chaw (qhov tsis xws luag hu ua "rolled-in scale"), nws yuav tsum tau muab tshem tawm los ntawm kev sib tsoo los yog pickling. Rau cov ntawv nyias, kev sib tsoo hnyav kom tshem tawm qhov tsis xws luag tuaj yeem txo cov thickness hauv qab kev ua siab ntev, ua rau siab tsis kam lees.
Supply Chain Implications:
Vim tias cov teeb meem no, tsis yog txhua lub mills tsim Alloy 901 daim ntawv. Nws yog feem ntau suav hais tias yog ib qho khoom "tshwj xeeb".
Lub Sijhawm Lead: Cia siab tias yuav siv sijhawm ntev dua piv rau bar lossis forgings, vim tias cov mills feem ntau khiav cov ntawv hauv cov phiaj xwm tshwj xeeb.
Yam tsawg kawg nkaus: Mills xav tau qhov tsawg kawg nkaus kom muaj nuj nqis (MOQs) kom pom tseeb qhov teeb tsa thiab kev pheej hmoo ntawm dov. Koj tsis tuaj yeem yooj yim xaj ib daim ntawv tawm ntawm lub txee.
Tus nqi: Qhov nyuaj txhais ncaj qha rau tus nqi siab dua ib phaus piv rau ntau cov alloys.
Q3: Lub chaw kho tsheb roj turbine tab tom txiav txim siab vuam qhov tawg ntawm Alloy 901 daim ntawv hlau shroud. Dab tsi yog qhov loj weldability kev txhawj xeeb, thiab dab tsi tshwj xeeb muab tub lim hlau thiab cov txheej txheem yuav tsum tau teev los xyuas kom muaj kev kho kom zoo?
A: Vuam Alloy 901, tshwj xeeb tshaj yog rau kev kho, yog ib qho kev ua haujlwm siab - uas yuav tsum tau ua raws li cov txheej txheem tshwj xeeb. Qhov kev txhawj xeeb tseem ceeb yog strain- hnub nyoog tawg hauv tshav kub- thaj chaw cuam tshuam (HAZ) thaum lub sij hawm xa ntawv -weld heat treatment lossis txawm tias thaum lub sijhawm ua haujlwm.
Kev txhawj xeeb Weldability: strain-Age Cracking
Alloy 901 ua tiav nws lub zog los ntawm nag lossis daus hardening (aging). Cov txheej txheem vuam tsim HAZ uas ntsib lub voj voog thermal, muab tso rau hauv lub xeev ntawm kev ntxhov siab.
Lub Tshuab: Yog tias cov khoom siv welded yog tom qab ntawd raug rau kev kho cua sov (lossis txawm tias qhov kev pabcuam kub siab), HAZ sim ua kom nag lossis daus ntawm Gamma Prime theem. Cov nag lossis daus no ua rau HAZ ntxiv dag zog thiab poob ductility precisely thaum cov seem welding stresses ua rau nws. Yog tias qhov kev ntxhov siab tshaj qhov tam sim no - cov khoom siv nkig, qhov tawg yuav tshwm sim.
Kev daws: Tshwj xeeb muab tub lim thiab txheej txheem
Filler Hlau Xaiv:
Tsis txhob siv cov chemistry muab tub lim. Ib tug muab tub lim txuam nrog lub hauv paus hlau (ERNiFeCr-2 hom) yuav ua rau muaj kev cuam tshuam rau tib qho kev tawg.
Cov Filler Pom Zoo: Siv ntau tshaj -alloyed muab tub lim xws li ERNiCrMo-3 (Alloy 625) lossis ERNiCrMo-4 (Alloy C-276).
Yog vim li cas: Cov high -nickel, siab- molybdenum muab tub lim ntau dua ntawm cov kab mob thiab tsis ua rau cov nag lossis daus tib yam - cov lus teb nyuaj li 901 lub hauv paus hlau. Lawv muab cov ductile weld tso nyiaj uas tuaj yeem ua kom haum rau qee yam tsis muaj kev tawg.
Vuam txheej txheem:
Cov Cuab Yeej Hluav Taws Xob Tsawg: Siv GTAW (TIG) nrog cov cua kub tsawg kawg nkaus kom txo tau qhov dav ntawm HAZ thiab cov kev ntxhov siab seem.
Preheat (Yeem): Qee zaum siv me ntsis preheat, tab sis nws yuav tsum tau ua tib zoo tswj.
Tom qab-Weld Heat Treatment (PWHT): Yog tias qhov yuav tsum tau rov qab los ntawm cov khoom siv hlau tag nrho, lub rooj sib txoos tag nrho yuav xav tau kev daws teeb meem tag nrho (kom txo tau qhov kev ntxhov siab) ua raws li rov qab -aging. Qhov no feem ntau yog siv tsis tau rau cov shrouds loj, uas yog vim li cas cov ductile muab tub lim yog nyiam rau kev kho.
Q4: Tshaj li daim ntawv hlau shrouds, dab tsi yog qhov tseem ceeb rotating Cheebtsam nyob rau hauv ib tug roj turbine uas yog ib txwm tsim los ntawm Alloy 901 phaj los yog forgings, thiab vim li cas qhov no alloy nyiam dua lwm txoj kev?
A: Thaum AMS 5661 npog daim ntawv, cov hlau yog kab tias nto moo tshaj plaws nyob rau hauv nws daim ntawv wrought (bar thiab forgings) rau rotating Cheebtsam -tshwj xeeb turbine discs thiab shafts.
Cov ntsiab lus tseem ceeb:
Compressor thiab Turbine Discs (Rotors): Cov no yog cov log uas tuav cov hniav. Lawv yuav tsum tiv taus siab centrifugal loads los ntawm rotating hniav nyob rau hauv siab kub.
Spacers thiab Sealing Rings: Cov no tuav axial sib nrug ntawm cov theem disc thiab kaw cov pa roj.
Bolting: Siab- kub bolts thiab fasteners rau flange kev twb kev txuas nyob rau hauv lub turbine nruab nrab-section.
Vim li cas Alloy 901 nyiam:
High Tensile thiab Yield Strength: Txog li ntawm 760℃(1400℃F), Alloy 901 tuav lub zog zoo heev - rau - qhov hnyav piv, qhov tseem ceeb rau kev tswj cov hoop stresses hauv spinning disc.
Zoo Creep thiab Rupture Strength: Nyob rau hauv lub disc ntug, uas ua hauj lwm ntawm qhov kub siab tshaj plaws, cov khoom yuav tsum tiv thaiv creep deformation tshaj kaum tawm txhiab teev. Alloy 901's gamma prime qauv muab qhov ntev -lub sij hawm stability.
Thermal Stability: Nws tiv taus embrittlement thaum lub sij hawm ntev - raug rau qhov kub thiab txias.
Tus nqi-Kev ua tau zoo: Piv rau siab dua- cov kev xaiv alloyed xws li Waspaloy lossis Rene 95, cov ntsiab lus hlau siab ntawm 901 ua rau nws muaj kev xaiv pheej yig dua rau cov forgings loj. Nws tso cai rau cov neeg tsim qauv siv txoj hauv kev "qib": 901 rau qhov txias txias, hloov mus rau cov ntaub ntawv alloyed ntau dua hauv cov theem kub tshaj plaws.
Q5: Ib tus kws tshaj lij tau muab piv rau AMS 5661 (Alloy 901) thiab AMS 5596 (Alloy 718) rau cov ntawv hlau tshiab ua haujlwm ntawm 650℃(1200℃F). Dab tsi yog qhov kev lag luam tseem ceeb- tawm ntawm cov khoom siv kho tshuab thiab cov ntaub ntawv uas yuav ua rau kev xaiv cov khoom kawg?
A: Ntawm 650℃(1200℃F), Alloy 901 thiab Alloy 718 yog cov neeg sib tw siv tau, tab sis lawv zaum ntawm ob sab ntawm kev ua haujlwm nkhaus. Qhov kev xaiv feem ntau nqis los rau kev lag luam - tawm ntawm qhov siab - qhov kub thiab txias thiab fabricability / weldability.
Sib piv ntawm 650℃(1200℃F):
| Khoom | Alloy 901 (AMS 5661) | Alloy 718 (AMS 5596) | Tus yeej? |
|---|---|---|---|
| Luv -Lub Sijhawm Tensile Strength | Zoo heev, siab heev | Zoo heev, siab heev | Khi |
| Creep & Rupture Strength | Me ntsis superior ntawm qhov kawg ntawm qhov ntau (mus rau 700 degree) | Zoo heev, tab sis lub zog poob qis dua sai dua 650℃vim gamma ob chav prime coarsening | 901 (Sib Ntug) |
| Weldability | Phem rau Fair. Muaj kev pheej hmoo siab ntawm kev mob - hnub nyoog tawg. Yuav tsum tau tshaj -alloyed muab tub lim. | Zoo heev. Tau welded nyob rau hauv cov kev daws teeb meem - kho los yog laus mob nrog cov txheej txheem kom raug. tuaj yeem siv cov khoom sib txuam. | 718 (Nyob zoo) |
| Formability (daim ntawv) | nyuaj dua. Lub zog siab dua ua rau khoov / stamping nyuaj. | Zoo dua. Ntau dua nyob rau hauv cov tshuaj - kho mob. | 718 (kwv yees) |
Kev txiav txim siab Matrix:
Xaiv Alloy 901 (AMS 5661) yog:
Cov tivthaiv yuav pom qhov kub thiab txias tsis tu ncua siab tshaj 650 degree, nce mus txog 700-750 degree.
Ib feem tsis yog welded heev, los yog welding yuav zam tau (xws li, machined los ntawm phaj los yog forging).
Qhov siab tshaj plaws ua tau creep zog yog xav tau, thiab tus nqi yog qhov kev txhawj xeeb thib ob rau kev ua haujlwm.
Xaiv Alloy 718 (AMS 5596) yog:
Cov khoom yuav tsum tau welding ntau heev thaum fabrication.
Ib feem yuav tsum muaj kev sib sau ua haujlwm (kev kos duab sib sib zog nqus, khoov nyuaj).
Qhov kev pabcuam siab tshaj plaws yog qhov ruaj ntseg hauv qab 650 degree.
Kev yooj yim ntawm kev tsim khoom thiab cov khoom lag luam muaj nyob yog qhov tseem ceeb ntawm kev tsav tsheb.
Nyob rau hauv cov ntsiab lus, nyob rau hauv lub "borderline" kub ntawm 650 degree, 718 muaj superior manufacturability, thaum 901 muaj ib tug me ntsis ntug nyob rau hauv siab - qhov kub thiab txias stability, ua rau kev xaiv heev nyob ntawm tus tsim tshwj xeeb thiab fabrication txwv.
