Cov ntsiab lus: Daim ntawv qhia kev rau Inconel 718 peev casting kev sib tw, suav nrog kub tawg thiab machining, thiab dab tsi cov neeg yuav khoom yuav tsum kuaj xyuas hauv tus neeg muag khoom.
Inconel 718 yog ib qho ntawm feem ntau siv nickel-based superalloys. Nws tuav lub zog siab, nkag siab, thiab qaug zog lub neej ntawm qhov kub txog li 700 ° C.
Cov khoom no ua rau nws xaiv tus qauv rau cov khoom siv hauv aerospace, roj turbines, thiab cov khoom siv roj thiab roj.
Txawm li cas los xij, tib yam ntxwv uas ua rau Inconel 718 xav tau kuj ua rau nws tsis yooj yim rau nrum thiab tshuab.
Thaum muab khoom Inconel 718 peev casting Cheebtsam, cov neeg yuav khoom feem ntau pom tias tsis yog txhua qhov chaw tsim khoom tuaj yeem xa cov suab nrov.
Nkag siab txog cov hauv paus hniav metallurgical ntawm cov teeb meem no yog qhov muaj txiaj ntsig ntau dua li tsuas yog thov cov npe ntawm cov ntawv pov thawj.
Cov ntawv pov thawj qhia tau hais tias lub chaw dhau los ntawm kev tshuaj xyuas, tsis yog tias nws cov txheej txheem tswj tau muaj peev xwm tswj hwm qhov tshwj xeeb alloy no.
Yog vim li cas Inconel 718 yog qhov nyuaj rau kev nqis peev Casting
Kev nqis peev casting yog qhov zoo rau Inconel 718 vim tias nws tuaj yeem tsim cov duab sib luag, ze-net thiab txo cov nqi kim superalloy tshem tawm los ntawm machining.
Tab sis cov txheej txheem solidification inherent rau casting qhia txog ob qho tseem ceeb tsis xws luag.
Qhov Risk ntawm Kub Cracking (Laves Phase)
Inconel 718 muaj niobium (Nb). Thaum lub sij hawm kawg ntawm solidification, cov kua residual yuav enriched nyob rau hauv Nb, silicon, thiab lwm yam, txhawb lub tsim ntawm Laves theem.
Kev tshawb fawb qhia tau hais tias txawm tias qhov seem ntawm Laves theem qis qis li 0.14-0.35 wt% tuaj yeem ua rau muaj kev puas tsuaj rau kub ductility thiab kev ntxhov siab tawg.
Lub xub ntiag ntawm Laves theem txuas ntxiv qhov kev ua haujlwm khov kho kom zoo, tawm hauv thaj chaw interdendritic tsis muaj ductility txaus kom haum rau cov kab mob sib kis lig hauv kev sib zog.
Nyob rau hauv thermally strained tej yam kev mob, qhov no ua rau kub tearing.
Txias tus nqi yog qhov hloov pauv tseem ceeb rau kev tswj Laves theem. Kev ua kom txias qeeb dua tso cai rau kev sib cais ntawm niobium ntau dua thiab ua rau muaj feem yuav khaws cov Laves seem nyob rau hauv chav tsev kub; txias txias tuaj yeem ua rau qee qhov txwv nws qhov tsim.
Yog li ntawd, tus tsim lub peev xwm los tswj lub plhaub preheat kub, ncuav kub, thiab txias lub sij hawm ncaj qha dictates nws txoj kev vam meej los tiv thaiv kub tawg.
Shrinkage thiab Internal Porosity
Tus cwj pwm shrinkage ntawm Inconel 718 yog rhiab heev rau lub qhov rais txheej txheem. Cov kev tshawb fawb simulation ntawm turbine hniav castings qhia tau hais tias thaum pwm nyob hauv lub sijhawm nce ntawm 0 s txog 420 s, lub plhaub kub poob los ntawm 1000 ° C mus rau 860 ° C, thiab tag nrho cov ntim ntim thiab zaus nce ntxiv.
Qhov no txhais tau hais tias yog tias thermal tswj ua ntej pouring deviates los ntawm lub qhov rais tsim, sab hauv porosity yuav nce ho.
Internal porosity nyob rau hauv Inconel 718 castings tsis yog ib qho tsis tshua muaj anomaly tab sis ib qho kev ua tsis tiav hom uas tshwm sim los ntawm kev tswj tsis txaus.
Rau cov kabmob load lossis qaug zog-tseem ceeb, txawm tias tom qab Kub Isostatic Pressing (HIP), micro-shrinkage tseem tuaj yeem ua rau lub neej qaug zog.
Yog li ntawd, kev pheej hmoo shrinkage yuav tsum tau hais los ntawm lub rooj vag system tsim thiab solidification simulation theem.
Kev Sib Tw Tom Qab Casting: Machining Inconel 718
Txawm hais tias lub suab nrov tseem ua rau muaj teeb meem loj ntawm machining. Inconel 718 muaj cov thermal conductivity tsawg, tsom rau kev txiav cov cua sov nyob ze ntawm lub cuab yeej, thaum nws cov qauv austenitic ua rau kev ua haujlwm sai sai hauv kev txiav txim siab.
Cov txheej txheem ua haujlwm no ua kom nrawm nrawm nrawm, tsim lub voj voog uas txiav ua rau cov khoom siv nyuaj, uas tig mus rau lub cuab yeej siv nrawm dua.
Rau kev txiav tsis, uncoated carbide cov cuab yeej ua tau zoo nyob rau hauv 10-30 m / min ntau yam; rau kev ceev tshaj 40 m / min, coated carbide inserts yog tsim nyog.
Qhov kev nrawm no yog qhov qis dua li cov qauv tsis sib xws rau txhuas lossis cov qauv hlau, lub ntsiab lus siv lub sijhawm ua haujlwm thiab cov cuab yeej siv rau Inconel 718 yog qhov siab dua.
Los ntawm qhov kev xav ntawm kev yuav khoom, qhov no tsa ib qho kev ntsuam xyuas tus neeg muag khoom tseem ceeb: foundries nrog hauv tsev machining peev xwm feem ntau muaj qhov zoo dua cov uas tsuas yog cam khwb cia thiab outsource machining.
Inconel 718 tus cwj pwm ua haujlwm hnyav xav tau kev sib koom ua kom zoo ntawm kev txiav cov cuab yeej, cov cuab yeej txoj hauv kev, thiab kev sib tw rigidity.
Yog hais tias lub foundry tswj ob qho tib si casting tolerances thiab machining nyiaj, nws muaj peev xwm qhia kom meej ntau tsim nyog tej yam kev mob thaum lub sij hawm casting, txo qhov kev pheej hmoo ntawm txawv txav cuab tam los yog nto kev puas tsuaj los ntawm cov nyiaj tsis zoo.
Yuav Ua Li Cas Ntsuam Xyuas Inconel 718 Foundry
Thaum ntsuas cov neeg xa khoom rau Inconel 718 castings, cov ntawv pov thawj yog qhov pib, tsis yog qhov txaus.
Cov peev txheej hauv qab no yog qhov qhia tau ntau dua ntawm seb lub chaw puas tswj tau cov hlau no tiag tiag.
1. Melting and Pouring Atmosphere Control. Inconel 718 yog rhiab heev rau oxygen, nitrogen, thiab hydrogen, yuav tsum muaj kev tiv thaiv tsim nyog thaum melting thiab pouring.
Nqus Induction Melting (VIM) tuaj yeem txwv oxidation thiab roj khaws qhov chaw siv tau, tab sis tsis yog txhua qhov Inconel 718 castings xav tau VIM. Txoj kev txheej txheem yuav tsum tau lees paub tiv thaiv ib feem specifications thiab cov qauv siv tau.
2. Kev kho cua sov tswj. Raws li-cam khwb cia hardness ntawm Inconel 718 tsis sawv cev rau kev ua haujlwm kawg.
Txoj kev kho cua sov uas feem ntau tau teev tseg hauv kev lag luam cov ntaub ntawv muaj kev daws teeb meem ntawm kwv yees li 980 ° C tom qab txias txias, thawj zaug laus ntawm 720 ° C rau 8 teev, cua txias rau 620 ° C rau 8-teev kev laus thib ob, thiab cua txias.
Qhov no ob-theem kev laus precipitates γ "them ntxiv zog lub luag hauj lwm rau lub alloy lub zog.
Yog tias tus neeg muag khoom tsis muaj lub tshuab hluav taws xob tswj tau thiab qhov ntsuas kub ntawm qhov ntsuas kub, qhov casting tuaj yeem ua tau raws li cov qauv kev ua haujlwm zoo, tab sis ua tsis tiav cov cuab yeej cuab tam.
3. Scope of Non-Destructive Testing (NDT). Lub shrinkage sab hauv thiab kub cracking nyiam ntawm Inconel 718 txhais tau tias NDT tsis tuaj yeem tso siab rau kev tshuaj xyuas ib leeg.
X-ray hluav taws xob kuaj pom cov shrinkage sab hauv thiab cov kab nrib pleb, fluorescent penetrant tshuaj xyuas (FPI) txheeb xyuas qhov tsis xws luag, thiab kev kuaj ultrasonic tuaj yeem ntxiv qhov ze-nto lossis kev ntsuam xyuas sab hauv.
Paub meej tias NDT puas ua haujlwm hauv tsev lossis tawm sab nraud, thiab seb qhov kev lees txais puas haum rau daim ntawv thov.
4. Material Traceability thiab Batch Consistency. Cov tshuaj muaj pes tsawg leeg ntawm txhua Inconel 718 tshav kub-tshwj xeeb tshaj yog Nb, Si, thiab C qib- thiab nws cov keeb kwm txias cuam tshuam Laves theem tsim nyiam.
Yuav tsum tau cov ntaub ntawv kub-ntu-theem melting, cov ntaub ntawv kho cua sov, thiab NDT cov ntaub ntawv yog ib txoj hauv kev ncaj qha los ntsuam xyuas seb tus neeg muag khoom cov txheej txheem tswj tau zoo.
5. Casting-rau-Machining Integration. Raws li tau sau tseg, Inconel 718 qhov kev ua haujlwm nyuaj ua rau qhov sib cuam tshuam ntawm casting thiab machining tseem ceeb.
Yog tias tus neeg muag khoom tuaj yeem tswj hwm tag nrho cov haujlwm hauv tsev, kev sib koom ua ke ntawm kev kam rau siab, kev tsim qauv, thiab cov tswv yim kho qhov tsis zoo feem ntau ua haujlwm tau zoo dua.
Rau cov piv txwv ntawm machining peev xwm rau complex alloys, koj tuaj yeem tshuaj xyuas peb lub peev xwm.
Application-Specific Considerations
Inconel 718 peev casting feem ntau poob rau hauv ob pawg ntawv thov.
Aerospace cav thiab roj turbine Cov khoom siv kub-section (xws li casings, mounting flanges, thiab brackets) yuav tsum muaj kev ua haujlwm siab ua haujlwm, nrog rau kev ua siab ntev rau sab hauv porosity thiab cov teeb meem ntawm kev ncaj ncees.
Roj, roj, thiab khoom siv hluav taws xob Cheebtsam xws li lub cev lub cev, lub twj tso kua mis, thiab cov khoom siv hauv lub taub hau tsom ntau dua rau kev tiv thaiv corrosion thiab siab ncaj ncees, qhov twg qhov tsis xws luag kam rau lub qhov rais rau kub-tawg-rhiab heev tab sis tsis- nkees-qhov tseem ceeb yuav yog qhov dav.
Qhov no tsis txhais hais tias ib daim ntawv thov yog "yooj yim dua" los nrum. Nws txhais tau hais tias qhov kev ntsuam xyuas tus neeg muag khoom tseem ceeb yuav tsum hloov nrog qhov kawg ntawm kev siv.
Lub chaw tsim khoom nrog cov ntaub ntawv xa khoom zoo ib yam ntawm cov txheej txheem tsis tseem ceeb ntawm cov txheej txheem castings yuav tsis muaj cov txheej txheem tswj thiab cov ntaub ntawv tsim nyog rau aerospace-qib Inconel 718 castings.
Qhia meej txog qhov kawg ntawm daim ntawv thov thiab cov qauv siv tau thaum lub sij hawm RFQ pab tus neeg muag khoom txiav txim siab seb nws cov txheej txheem muaj peev xwm ua tau zoo li cas, zam qhov kev tshawb pom ntawm cov kev lees paub tsis sib haum tsuas yog tom qab muaj kev tsis sib haum xeeb.
