Inconel 718 yog cov tsis tshua muaj npib tsib xee alloy uas nws lub zog tsis muaj nyob kom txog thaum lub tshuab kho cua sov tsim nws. Nyob rau hauv lub annealed mob nws yog ib tug me ntsis 1000 MPa-chav kawm khoom; tom qab ob -kev kho nag lossis daus nws nce mus txog 1270 MPa yam tsawg kawg nkaus tensile nrog cov txiaj ntsig siab tshaj 1030 MPa, thiab qhov sib txawv ntawd yog vim li cas cov hlau alloy tau teev tseg hauv cov tshuab tig thiab cov khoom siv siab.
Inconel 718 yog dab tsi
Inconel 718 (UNS N07718, EN 2.4668)yog nag lossis daus-nickel hardenable-chromium- hlau alloy ntxiv dag zog los ntawm ob theem intermetallic: gamma ob -prime (g″, Ni3Nb) ua thawj theem hardening thiab gamma prime (g′, Ni3 (Al, Ti)) raws li theem nrab.
Cov alloy yog txawv ntawm cov nickel superalloys nyob rau hauv uas nws muaj hnub nyoog - hardening teb yog qeeb, uas yog raws nraim li cas ua rau nws weldable yam tsis muaj cracking uas plagues sai - laus alloys xws li X-750. Nws khaws lub zog siab los ntawm qhov kub thiab txias txog li 650℃(1200℃F), uas yog lub hnab ntawv ua haujlwm feem ntau cov ntaub ntawv sau tseg rau kev pabcuam mus sij hawm ntev.
| Yam khoom | Tus nqi |
|---|---|
| UNS tus lej | N07718 |
| EN / Werkstoff tus lej | 2.4668 |
| Cov npe | Inconel 718, Alloy 718, Nickel 718, NiCr19Fe19Nb5Mo3 (EN shorthand) |
| Tsev neeg | Cov dej nag-hnyav Ni-Cr-Fe-Nb-Mo |
| Txhim kho mechanism | g″ (Ni3Nb) thawj + g′ (Ni3(Al, Ti)) theem nrab |
| Qhov ntom | 8.19 g / cm3 (0.296 lb / hauv 3) |
| Melting ntau | 1320-1390 ° F (2410-2540 ° F) |
| Kev pabcuam siv tau | -250℃rau +650℃ntev |
Tshuaj muaj pes tsawg leeg
Cov muaj pes tsawg leeg hauv qab no yog lub hnab ntawv lees paub siv los ntawm AMS 5662 / AMS 5663 thiab ASTM B637 rau cov tuav thiab forgings. Niobium yog lub ntsiab lus txhais: nws tsim Ni3Nb gamma ob npaug -prime precipitate thaum lub sij hawm laus, thiab nws qhov ntau yog tswj nruj heev vim tias tsawg niobium txo cov lus teb hardening thaum ntau dhau txhawb kev sib cais thiab Laves theem. Hlau tsis yog ib qho impurity ntawm no tab sis ib qho kev txiav txim siab sib npaug uas ua rau cov lus teb qeeb thiab txhim kho fabricability.
| Element | Min (%) | Max (%) | Lub luag haujlwm |
|---|---|---|---|
| Nickel + Cobalt (Ni + Co) | 50.0 | 55.0 | Base matrix; siab - qhov kub thiab txias |
| Chromium (Cr) | 17.0 | 21.0 | Oxidation thiab corrosion kuj |
| Hlau (Fe) | Tshuav | - | Matrix sib npaug; slows aging teb rau weldability |
| Niobium + Tantalum (Nb + Ta) | 4.75 | 5.50 | Cov ntawv g″; thawj hardening keeb |
| Molybdenum (hli) | 2.80 | 3.30 | Khoom- daws teeb meem |
| Titanium (Ti) | 0.65 | 1.15 | Cov ntawv g′; co- dej nag |
| Aluminium (Al) | 0.20 | 0.80 | Cov ntawv g′; co- dej nag |
| Cobalt (zeeg) | - | 1.00 | Impurity txwv nyob rau hauv feem ntau specifications |
| Cov pa roj carbon (C) | - | 0.08 | Khaws qis kom tsis txhob carbide embrittlement |
| Manganese (Mn) | - | 0.35 | Tswj impurity |
| Silicon (Si) | - | 0.35 | Tswj impurity |
| Phosphorus (P) | - | 0.015 | Tswj impurity |
| Sulfur (S) | - | 0.015 | Tswj impurity; tseem ceeb rau kev ua haujlwm kub |
| Copper (Cu) | - | 0.30 | impurity txwv |
| Boron (B) | - | 0.006 | Micro- alloy rau nplej- ciam teb lub zog |
Cov Txheej Txheem Ua Los nag: Vim li cas Kev Kho Hniav Kub Tsim kom muaj zog
Nyob rau hauv qhov mob annealed Inconel 718 yog ib qho khoom siv -solution alloy nrog lub zog nruab nrab, kwv yees li 1030 MPa qhov tensile yam tsawg kawg nkaus hauv AMS 5662.
Kev kho cua sov los nag yuav siv cov hlau mus rau 185 ksi (1276 MPa) qhov tensile yam tsawg kawg nkaus vim nws yuam ob yam tshwm sim hauv microstructure: niobium, titanium thiab aluminium atoms, uas yog yaj hauv matrix tom qab kev daws teeb meem, tawm los ntawm kev daws raws li nanometer- nplai Ni3Nb thiab Ni3 (Al, T; thiab cov hais no pin lub dislocation txav uas yuav txwv tsis pub cov yas deformation.
Ob - kauj ruam kev laus muaj nyob vim tias ob theem teb ntawm qhov kub sib txawv: thawj kauj ruam ntawm 1325℃F nucleates g″ theem, thiab qhov thib ob ntawm 1150℃F cia nws loj hlob mus rau qhov loj uas muab lub zog zoo tshaj - toughness balance. Hla los yog ua kom luv ob kauj ruam tawm ntawm cov hlau nyob rau hauv - hardened, uas yog vim li cas tshav kub- cov ntaub ntawv kho mob tseem ceeb rau 718 ntau dua rau yuav luag txhua yam nickel alloy.
Kev Xa Khoom: AMS 5662, AMS 5663 thiab AMS 5664
Peb cov xwm txheej AMS tseem ceeb ntawm kev yuav khoom ntawm Inconel 718 tuav, forgings thiab yeeb nkab. Lawv yog tib yam chemistry; qhov sib txawv yog tag nrho cov cua sov-kev kho mob, thiab txhua tus muaj txoj haujlwm sib txawv hauv cov khoom siv.
| Specification | Qhov xwm txheej | Yam tsawg kawg nkaus (chav temp) | Hom kev siv nyob rau hauv Supply Chain |
|---|---|---|---|
| TIAB SA 5662 | Tshuaj kho tau (annealed) | UTS 1034 MPa (150 ksi) min, YS 517 MPa (75 ksi) min | Raw khoom rau machining; mos txaus txiav yooj yim |
| TIAB SA 5663 | Tshuaj kho + nag lossis daus hardened | UTS 1276 MPa (185 ksi) min, YS 1034 MPa (150 ksi) min, EL 12% min, RA 15% min | Kev pabcuam-npaj rotating hardware thiab siab qhov chaw |
| TIAB SA 5664 | Siab dua -lub zog txias- ua haujlwm + hnub nyoog hloov pauv | Tshaj AMS 5663 ntawm lub zog | Fasteners thiab qhov chaw xav tau lub zog siab tshaj plaws |
Rau cov kav dej thiab cov khoom siv siab, qhov kev txiav txim siab yog: xaj AMS 5662 thaum qhov yuav tsum tau tshuab lossis khoov ua ntej thiab tawv tom qab, thiab xaj AMS 5663 thaum qhov khoom xa tuaj rau qhov kawg.
Ib qho kev ua yuam kev ntau yog thov rau AMS 5663 yeeb nkab thiab tom qab ntawd tshuab lossis txias - khoov nws hauv - tsev, uas ua haujlwm - tawv thiab tuaj yeem cuam tshuam ib feem uas twb muaj zog lawm; txoj hauv kev raug rau machined-los ntawm- cov khoom nyoos yog AMS 5662 ua raws li kev tswj kev laus.
Kev kho cua sov
Cov txheej txheem nag lossis daus hnyav ib puag ncig AMS 5663 yog ob -kev kho mob. Cov tshuaj kho mob ua ntej kev laus dissolves lub hardening ntsiab thiab teem lub grain loj; cov kauj ruam laus nucleate thiab loj hlob cov precipitates.
| Kauj ruam | Kub | Sijhawm / cua txias | Lub hom phiaj |
|---|---|---|---|
| Kev daws teeb meem | 927-1010℃(1700-1850℃F) | Tuav ib ntu me me, cua txias lossis nrawm dua | Dissolve Nb, Ti, Al; teem grain loj |
| Kev laus theem 1 | 718℃(1325℃F) | 8 hnu | Nucleate g″ (Ni3Nb) theem |
| Kev laus theem 2 | 621℃(1150℃F) | Rauv txias los ntawm kauj ruam 1; tag nrho cov laus lub sij hawm 18 h; cua txias | Loj hlob g″ thiab g′ kom loj hlob zoo |
Txoj kev 1325/1150℃F yog AMS tus qauv. Daim ntawv ceeb toom rau fabricators: lub alloy qhia ib tug contraction ntawm 0.0008 nyob rau hauv / nyob rau hauv tom qab nag lossis daus hardening, yog li precision-machined qhov ntev yuav tsum tau teem ua ntej aging los yog cov contraction accounted nyob rau hauv lub machining nyiaj.
Cov ntaub ntawv lub cev thiab tshuab
Cov lus hauv qab no sib xyaw ua ke ntawm lub cev tsis tu ncua nrog tus neeg sawv cev ntawm tus cwj pwm ntawm qhov kub thiab txias. Chav tsev - qhov kub thiab txias tsawg kawg yog kev cog lus, qhov siab siab - qhov ntsuas kub yog qhov tseem ceeb rau kev taw qhia tsim.
| Khoom | Tus nqi |
|---|---|
| Qhov ntom | 8.19 g / cm3 |
| Modulus ntawm elasticity, chav tsev kub | 200 GPa (29 x 10³ ksi) |
| Txhais CTE, 20-300 degree | 13.9 µm/m·K |
| Thermal conductivity, chav tsev kub | 11.4 W/m·K |
| UTS, annealed (AMS 5662 min) | 1034 MPa rau |
| UTS, hnub nyoog (AMS 5663 min) | 1276 MPa rau |
| YS, hnub nyoog (AMS 5663 min) | 1034 MPa rau |
| Elongation, hnub nyoog (AMS 5663 min) | 12% |
| Hardness, laus (tseem) | 331 HBW min (kwv yees 36 HRC) |
Siab -Tub thiab Cryogenic Cwj Pwm
Cov qauv nag lossis daus tib yam uas muab 718 nws chav- qhov kub thiab txias yog qhov ruaj khov rau li 650 degree, uas yog vim li cas cov hlau tuav tau siv tau tensile thiab creep zog nyob rau hauv lub turbine thiab downhole ntau yam. Cov khoom uas muaj hnub nyoog ntawm 650℃tseem pom nyob ib puag ncig 1100 MPa tensile, thiab kev ntxhov siab-kev ua haujlwm tawg yog vim li cas 718 yog tus qauv tig-hardware alloy.
Ntawm qhov kawg ntawm lub hnab ntawv, lub austenitic matrix tsis muaj ductile - mus rau - nkig hloov, yog li cov hlau yog dav siv nyob rau hauv cryogenic tso tsheb hlau luam thiab li qub mus rau cov kua - hydrogen kub. Qhov kev sib xyaw ua ke no, lub zog siab ntawm ob qho tib si kub siab heev nrog weldability nyob rau hauv nruab nrab, yog vim li cas tsis muaj lwm yam npib tsib xee alloy phim nws specification suav nyob rau hauv aerospace thiab roj- thiab - roj.
Vuam thiab Fabrication
ib 718yog welded nrog npib tsib xee -puag muab tub lim hauv ERNiFeCr-2 chav kawm (AWS A5.14), uas paub Inconel 718 muab tub lim tsev neeg. Lub alloy tuaj yeem welded nyob rau hauv ob qho tib si annealed los yog cov laus mob; cov lus teb qeeb qeeb txhais tau hais tias cov cua sov- thaj tsam cuam tshuam tsis tawg tom qab vuam txoj kev uas cov hlau nplaum sai sai ua.
Thaum welded nyob rau hauv lub annealed mob thiab tom qab laus laus, cov hlau weld tsim ib tug loj feem ntawm lub hauv paus -hlau lub zog, uas yog vim li cas weldments ib txwm tsim raws li AMS 5662 cov ntaub ntawv ntxiv ib tug ncej -weld aging voj voog. Cold forming yog ncaj qha nyob rau hauv lub annealed mob; Cov khoom muaj hnub nyoog muaj zog txaus uas tsim yuav tsum tau ua ua ntej nag lossis daus hardening. Machining sau ntawv tsom rau lwm cov nickel alloys: kev teeb tsa nruj, pub zoo, thiab cov cuab yeej ntse kom tsis txhob ua haujlwm nyuaj.
Cov qauv thiab cov qauv khoom
| Daim ntawv | Kev tswj hwm tus qauv | Hom kab mob |
|---|---|---|
| Bar, hlau, hlau | ASTM B637 / AMS 5662, 5663, 5664 | Dia 6-300 mm |
| Seamless yeeb nkab thiab raj | AMS 5662-txoj kev, ib qhov project spec | OD 21.3–168.3 hli (NPS 1/2–6) |
| Phaj, ntawv, strip | ASTM B670 / AMS 5596, 5597 | Thickness 0.5-100 hli |
| Forgings thiab rings | ASTM B 637 Cov | Ib daim duab |
| Fasteners | AMS 5662/5663 + NACE MR0175 variants | Ib daim duab |
Daim ntawv thov
- Aerospace: turbine discs, compressor hniav, cav shafts, casings thiab fasteners
- Rocket engines: turbopumps, vaj tse, thrust Cheebtsam
- Roj thiab roj: cov cuab yeej downhole, MWD / LWD vaj tse, twj tso kua mis, kev nyab xeeb li qub, cov khoom siv hauv lub taub hau rau NACE MR0175 / API 6A CRA
- Cryogenic: LNG thiab hydrogen tanks, li qub, hloov kav dej
- Nuclear: reactor internals thiab tswj -rod Cheebtsam
- Kev lag luam: siab -kub springs, fasteners, tuag thiab tooling
Common Procurement yuam kev
- Ordering AMS 5663 yeeb nkab thiab machining nws nyob rau hauv -lub tsev, poob cov laus mob ntawm lub machined nto
- Piv txwv tias tag nrho 718 daim ntawv pov thawj zoo ib yam: tus mob (annealed vs aged) yuav tsum tau teev nyob rau hauv PO
- Hla lub 1150℃F thib ob aging kauj ruam, uas tawm cov hlau nyob rau hauv -hardened
- Tsis quav ntsej txog 0.0008 hauv / hauv kev laus kev cog lus hauv qhov tseeb qhov ntev
- Siv 625-chav muab tub lim rau 718, uas hloov cov vuam hlau chemistry thiab txo cov hnub nyoog zog
FAQ
Q: Qhov txawv ntawm AMS 5662 thiab AMS 5663 Inconel 718 yog dab tsi?
AMS 5662 yog cov kev daws teeb meem -annealed mob nrog roughly 1034 MPa tensile yam tsawg kawg nkaus; AMS 5663 yog tib cov ntaub ntawv los nag-hardened rau 1276 MPa yam tsawg kawg nkaus tensile. Order 5662 rau machining thiab tsim, ces muaj hnub nyoog; xaj 5663 rau kev pabcuam -cov khoom npaj txhij.
Q: Inconel 718 hardened li cas?
Los ntawm ob- hnub nyoog theem: 8 teev ntawm 718℃(1325℃F), tom qab ntawd rauv txias rau 621℃(1150℃F) rau tag nrho cov laus lub sijhawm 18 teev, ces cua txias. Kev kho mob precipitates Ni3Nb (g″) thiab Ni3 (Al, Ti) (g′) theem uas pin dislocations.
Q: Inconel 718 tuaj yeem tiv taus qhov kub li cas?
Ntev - kev pab cuam mus txog 650℃(1200℃F), nrog rau kev ua haujlwm zoo cryogenic mus txog -250℃. Tshaj 650℃g ″ theem overages thiab lub zog poob.
Q: Puas yog Inconel 718 weldable?
Yog lawm, tsis zoo li rau nag lossis daus-nickel alloy hardened, vim nws cov lus teb qeeb qeeb. Siv ERNiFeCr-2 muab tub lim; weld nyob rau hauv annealed mob thiab hnub nyoog tom qab ntawd rau ze - puag-hlau weld zog.
Q: Cov qauv dab tsi npog Inconel 718?
ASTM B637 (bar thiab forgings), ASTM B670 (phaj), AMS 5662/5663/5664 (aerospace tej yam kev mob), ntxiv rau NACE MR0175 / ISO 15156 thiab API 6A CRA variants rau roj thiab roj.
Q: Inconel 718 puas tuaj yeem siv rau hauv kev pabcuam qaub?
Yog lawm, 718 yog ib qho ntawm ob peb lub siab -lub zog alloys teev nyob rau hauv NACE MR0175/ISO 15156 rau ib puag ncig qaub, nrog rau kev txwv hardness uas yuav tsum tau kuaj xyuas ntawm daim ntawv pov thawj
