Inconel 718 Machining rau high-} qhov kev thov kub

1

Inconel 718 retains >600 mpa kom muaj zog ntawm 650 degree, ua nws tsis tseem ceeb rau turbine disks thiab combustor xreters [1]. Cov tshuab ua haujlwm machining tsim kho lub cuab tam zoo hnav thiab tensile seem kev ntxhov siab, kev ua kom qaug zog zoo [2]. Hybrid Cryogenic {{6} Laser Pab Machining (Clam) tau ua pom muaj peev xwm txo cov teeb meem no Txoj kev kawm no kom muaj kev ua tau zoo ntawm kev nyab xeeb dej nyab

2 Tshawb Fawb Txoj Kev
2.1 sim tsim
Ib qho kev xaivuchi l9 orthogonal tau raug xaiv los txo cov kev sim ua ntu zus thaum mus ntes thawj zaug- kev sib txuas lus xaj (rooj 1). Independente variables: txiav ceev (vc), pub (f), thiab kua {{{}} nitrogen dav hlau siab (p). Dependent variables: tool life (T), flank wear (VB), surface roughness (Ra), residual stress (σr).

Cov lus 1 ntau qib rau L9 array
Theem|Vc (m min⁻¹)|f (mm revol)|P (mpa)
1 | 30 | 0.05 | 2
2 | 60 | 0.10 | 4
3 | 90 | 0.15 | 6

2.2 khoom thiab txua
Workpiece: tov {-}}}} kho thiab aged inconel 718 (Ams 5662), Hardness 44 ± 1 hrc. Txiav ntxig: Sandvik Cnmg 120408-PM, qib 1105 (tialn-tin multiilayer, 3.5 μm). Cuab yeej: Psbnr 2525m12, mus ze rau lub 55 degree, rake 6 degree, tshem tawm 5 degree.

2.3 apparatus
Siv lub tshuab cuab tam: dmg - mori nlx 2500 sy, siab tshaj plaws ntxaiv 4,000 rpm. Cryogenic tus me nyuam: dual - nozzle kua {}} nitrogen system (siab 0-8 MPa, ntws 3-15). Laser ua ntej- cua sov: 500 w fiber laser laser (}}}}}}}}}}}}}}}}}} {, muaj hwj chim ntom 15 kw cm⁻².

2.4 Cov Ntaub Ntawv Nrhiav
Cov rog ntsuas los ntawm Kistler 9129aa triaxial dynamometer; Cov cim piv txwv ntawm 20 KHz thiab qis -} dhau lim ntawm 1 KHz. Tool-nti interface kub tau los ntawm dual - wave pyrometer (1.5-1.8 μm, 1 kHz). Residual kev ntxhov siab tau txiav txim los ntawm x- ray diffraction (sin6 txujci, cr {k hluav taws xob) ntawm 50 μm nce ntxiv. Nto roughness kaw ntawm Alicona Infinitefocus G5 (0.01 μm kev daws teeb meem).

2.5 thermal qauv
Johnson-ua noj constitutive tsis tau kho los ntawm split - howk} kev ntsuam xyuas thiab 10⁻³-10⁴ s⁻¹ strain tus nqi. Qhov ntsuas kub nce nyob rau hauv thawj shear Cheeb Tsam tau kwv yees siv oxley lub tshuab faib ua kev faib ua ke los ntawm infrared thermography.

3 cov qhab nia thiab tshuaj ntsuam
3.1 Cov Cuab Yeej Cuab Tam
Daim duab 1 ua rau Frank hnav kev vam meej hauv qab peb cov tswv yim txias. CLAM lees txais cov ris tsho sib luag (VB= 0.3 mm ntawm 28.7 min), hos} lub neej kev ua neej nyob ntawm 12.1 min. SEM micrographs qhia cov kev sib txawv me ntsis hnav hauv dej nyab txias, suppressed hauv clam los ntawm qis interface kub (δ ≈ 200 degree).

3.2 Nto Ntsej Muag
Daim duab 2 Ib qho piv rau RA thiab Residual Kev Nyuaj Siab Profiles. Clam tsim tsa ra= 0.31} 0.02 ± 0.02 μm, piv nrog 0.47 ± 0.05 μm Thaum dej nyab. Residual kev ntxhov siab hauv clam tseem compressive (-380 ± 45 mpa) rau 150 μm qhov tob; Dej nyab cua hlob heev tsim tawm ({{10} ± 30 mpa) ntawm 50 μm.

3.3 Kev Ua Haujlwm Quav
Peb {{-} х sending khoov (aTTM E466) ntawm 650℃tau pom tias muaj dej nyab (2.6} txias} × 10⁵). Fractography Paub meej tias tawg kev pib ua haujlwm los ntawm saum npoo los sub - nplaim, sib xws nrog cov kev ntxhov siab compressive.

3.4 Tsim Cov Qauv
Kev kwv yees thawj shear - cheeb tsam pom zoo tsis pub dhau 8% ntawm pyrometry cov ntaub ntawv hla txhua qhov kev sib txuas ua ke (r²= 0.92). Qhov ntsuas hluav taws xob calibal ua rau txheej txheem npaj npaj ua ntej kom muaj qhov ntsuas kub hauv qab 650 degree, txo kev sib cais kev sib cais hnav.

4 kev sib tham
4.1 Hnav cov roj ntsha suprionion
Qis interface kub nyob rau hauv Clam inhib inhibits tialn oxidation thiab txo cobalt binder diffusion rau hauv lub nti, txuas ntxiv cuab yeej. Lub laser ua ntej -} kub moderates thermal kub moderates thermal rhawv hluav taws xob los ntawm cov mic, {}}} Tsuas yog kev tshawb fawb [4].

4.2 Residual Kev Nyuaj Siab Tsim
Compressive kev ntxhov siab los ntawm sai li cas cryogenic quenching ntawm cov khoom siv machined. Laser ua ntej -} Thaum tshav kub kub} Cov cua sov uas nquag txias, tiv thaiv kev puas ntsoog ntau dhau lawm (}} ni₃nb) uas tuaj yeem ua rau devent (5].

4.3 Qhov Txwv
Kev sim ua haujlwm ua haujlwm tas mus li; Kev cuam tshuam kev txiav yeeb yam ib txwm muaj Milling tej zaum yuav hloov cov hluav taws xob muab faib thiab kev ntxhov siab. Cov khoom siv anisotropy hauv forged disks tsis nyob. Kev ntsuas nyiaj txiag ntawm cov kua - Cov khoom noj nitrogen kev lag luam muaj qhov khoom lag luam muaj txiaj ntsig tau tseem tos.

4.4 Cov tswv yim cuam tshuam
CLAM ua rau qhuav lossis ze {- qhuav siv li 650 degree, txo cov lus nug coolant los ntawm 40%. Kev sib koom ua ke nrog kev tswj hwm kev yoog raws tiag- lub sij hawm} lub sij hawm} lub sij hawm} lub sij hawm} lub sij hawm kev pom zoo kom them rau kev ntxig hnav thiab workpiece hloov pauv.

5 Cov lus xaus
CLAM extends tool life 2.4-fold and doubles fatigue life of Inconel 718 components by sustaining compressive residual stress and low surface roughness at 650℃. Qhov qauv siv thermal siv tau muab cov moj khaum repramewort tau rau parameter xaiv. Kev ua haujlwm yav tom ntej yuav tsum tsom rau milling kev sim thiab kev txheeb xyuas tus nqi tsom xam.

Cim npe nrov: Inconel 718 Machining rau high-}}}}}