Daim Ntawv Qhia Kom Paub Txog Nickel-Based Superalloys: Inconel 718 (Alloy 718 / UNS N07718)
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Daim Ntawv Qhia Kom Paub Txog Nickel-Based Superalloys: Inconel 718 (Alloy 718 / UNS N07718)
Inconel 718 tseem hu ua "Alloy 718" thiab muaj npe UNS N07718 lossis W.Nr.2.4668 (Suav lub npe: GH4169). Nws yog lub hnub nyoog-hardening Ni-Cr-Fe-raws li superalloy uas muaj ntau cov hlau, niobium thiab molybdenum, thiab me me ntawm txhuas thiab titanium. Titanium thiab niobium tau ntxiv los daws qhov teeb meem ntawm lub hnub nyoog straining thaum vuam thiab kho. Inconel 718 sib txuas ua ke corrosion kuj thiab siab zog nrog zoo weldability, nrog rau tom qab weld cracking kuj. Cov alloy muaj qhov zoo heev creep rupture zog ntawm qhov kub txog li 1300 degree F [700 degree].
Inconel 718 alloy precipitates los ntawm lub cev-centered tetragonal 'theem thiab FCC' theem, thiab muaj cov khoom zoo hauv qhov kub ntawm -253 degree mus rau 700 degree . Lub zog tawm los qis dua 650 degree yog thawj zaug ntawm cov deformed high-temperature alloys. Nws muaj kev qaug zog zoo, hluav taws xob tiv thaiv, oxidation tsis kam thiab corrosion kuj, thiab muaj kev ua haujlwm zoo, weldability thiab kev ruaj ntseg ntev. Cov khoom uas muaj cov duab nyuaj tuaj yeem tsim thiab tau siv dav hauv kev lag luam aerospace, nuclear zog thiab roj av kev lag luam nyob rau hauv qhov kub thiab txias.
Cov khoom ntawm Inconel 718 (Alloy 718 / UNS N06718)
Inconel718 nag lossis daus hardening molybdenum alloy muaj niobium thiab nickel-chromium alloy. Nws muaj lub zog siab thiab zoo toughness ntawm 700 degree, thiab muaj corrosion kuj zoo nyob rau hauv qhov kub thiab txias ib puag ncig. Kev xa khoom tuaj yeem kho tau los yog nag lossis daus hardened.
Yooj yim rau txheej txheem;
Nws muaj lub zog tensile siab, qaug zog lub zog, creep zog thiab tawg lub zog ntawm 700 degree;
Oxidation tsis kam ntawm 1000 degree;
Chemically ruaj khov ntawm qhov kub thiab txias;
Nws yog tus cwj pwm los ntawm kev siv vuam zoo.
Alloy 718 muaj kev tiv thaiv zoo heev rau kev ntxhov siab corrosion cracking thiab pitting corrosion nyob rau hauv ob qho tib si kub thiab tsis kub ib puag ncig. Alloy 718 muaj qhov tshwj xeeb oxidation tsis kam ntawm qhov kub thiab txias.
Corrosion kuj ntawm Inconel 718 (Alloy 718 / UNS N06718)
Cov tshuaj muaj pes tsawg leeg ntawm cov alloys tuaj yeem muab faib ua peb pawg: tus qauv muaj pes tsawg leeg, cov khoom muaj txiaj ntsig zoo thiab cov khoom siv purity siab. Cov khoom xyaw zoo tuaj yeem txo cov pa roj carbon monoxide thiab nce niobium raws li cov txheej txheem cov khoom xyaw, yog li txo cov niobium carbide, txo qhov qaug zog, ua kom muaj zog ntawm cov theem, thiab txhim kho kev qaug zog thiab cov khoom siv zog. Nyob rau tib lub sijhawm, cov ntsiab lus ntawm kev puas tsuaj impurities thiab gases raug txo. Cov khoom xyaw purity siab yog ua raws li cov qauv zoo los txo cov ntsiab lus ntawm cov sulfur thiab cov impurities tsis zoo thiab txhim kho cov purity thiab kev ua tau zoo ntawm cov ntaub ntawv.
Cov ntsiab lus boron ntawm Inconel 718 alloy rau nuclear zog yuav tsum tau tswj (lwm cov ntsiab lus tseem tsis hloov), thiab cov ntsiab lus tshwj xeeb yog txiav txim los ntawm kev sib tham ntawm ob tog. Thaum ω(b) Tsawg dua lossis sib npaug rau 0.002%, nws txawv ntawm Inconel 718 alloy siv hauv kev lag luam aerospace, thiab qib alloy yog Inconel 718A.
Kev kho cua sov qhov system Nickel-based alloy Incoloy 718
Alloys muaj cov txheej txheem kho cua sov sib txawv los tswj cov qoob loo loj, zoo li, faib thiab kom muaj nuj nqis ntawm delta theem, yog li tau txais cov khoom sib txawv. Kev kho cua sov ntawm cov hlau tuaj yeem muab faib ua peb hom:
(1) (1010 - 1065) degree ± 10 degree, 1h, roj txias, cua txias lossis dej txias +720 degree ± 5 degree, 8h, rauv cua txias 50 degree / h txog 620 degree ± 5 degree, 8h, cua txias. Cov txiaj ntsig tau pom tias cov qoob loo loj ntawm cov khoom siv tom qab kev kho mob coarsened, tsis muaj δ theem nyob rau hauv cov qoob loo ciam teb thiab cov nplej, thiab tsis muaj rhiab heev, tab sis nws muaj txiaj ntsig los txhim kho qhov cuam tshuam kev ua tau zoo thiab qis-kub hydrogen embrittlement tsis kam.
(2) (950 - 980) degree ± 10 degree, 1h, roj txias, cua txias lossis dej txias +720 degree ± 5 degree, 8h, rauv cua txias 50 degree / h rau 620 degree ± 5 degree, 8h, cua txias. Nws yog qhov kev kho cua sov uas siv ntau tshaj plaws thiab tseem hu ua cov txheej txheem kev kho cua sov.
(3) Txias rau 5 degree ± 8 degree ntawm 620 degree / h, khaws cia rau 50h, thiab txias hauv huab cua rau 8h. Muaj tsawg dua theem δ nyob rau hauv cov khoom kho, uas tuaj yeem txhim kho lub zog thiab cuam tshuam cov khoom ntawm cov khoom. Cov kab ke no tseem hu ua direct aging heat treatment system.
