Cov cuab yeej siv hlau 3D tseem tsis tau mus txog qhov kev tsim khoom yog flawless yog kev tawm tsam cov teeb meem ntawm kev ua kom tiav cov teeb meem ntawm kev ua haujlwm zoo, thiab thermal deformation uas muaj nyob rau hauv kev luam ntawv. Txawm hais tias qhov ceev, lub zog thiab cov khoom lag luam saum npoo tuaj yeem ncav cuag cov teeb meem zoo nkauj, tab sis kev ntxhov siab rau cov kev pab zoo nkauj, suav nrog kev ua kom zoo nkauj, suav nrog kev ua kom nruj thiab, ntxhov siab thiab.
Ntawm cov txheej txheem tom qab no, kub yog cov kauj ruam tseem ceeb uas tsis tuaj yeem raug rho tawm hauv ob qho tib si thov kev kho mob thiab kev kho mob. Thermal isostatic nias (hip rau luv luv) yog tso cov khoom lag luam rau txhua lub sijhawm siv cov cua txias, nyob rau hauv txhua lub sijhawm siv cov cua sov thiab muaj kev kub siab, cov khoom tuaj yeem yog saws ntxiv thiab densification. Yog li dab tsi kub ostatic nias cov txheej txheem entail?
1. Densification tshem tawm tej yam
Nyob rau hauv cov kub cov khoom siv muaj zog yog tsawg heev, muaj qhov yooj yim, muaj qhov nyob hauv thaj av uas tau ploj, txhua feem ntawm cov descification tuaj yeem ua tiav.
2.sim rau lub koom haum thiab morphology
Cov txheej txheem kub kub sov ntawm kub yog sib npaug rau annealing, uas tuaj yeem tshem tawm cov txheej txheem overcooling lossis sub-ruaj khov txias ua rau daim ntawv siab txias.
3. Txhim kho cov khoom siv kho tshuab
Cov khoom siv mechanical ntawm cov khoom ua ntej thiab tom qab kub oovtatic nias kuj hloov tau ntau. Seb SLM lossis EBM, kub iSostatic nias tom qab lub zog ntawm cov khoom muaj, tshwj xeeb tshaj yog rau cov txheej txheem SLM txheej txheem pom tseeb. Lub hardness ntawm cov khoom kuj hloov nrog lub duav, thiab lub hardness txo los ntawm 5-10% tom qab lub duav. Zuag qhia tag nrho, Kub OOSTATIC nias tuaj yeem txhim kho kev nruj thiab kev tiv thaiv kom nkees nkees dhau ntawm cov khoom.
Nws tau pom tias kub iSostatic nias tau tseem zoo nyob rau hauv lub suab paj nruag uas muaj ntau ntxiv, piv rau cov qauv zoo dua rau 2 hli xov tooj loj. Porosity hloov raws li lub xov tooj ntawm cov hnoos qeev tau tseem pom. Lub porosity ntawm lub duav nrog 4 hli cell tau txo los ntawm 57% thiab qhov porosity ntawm cov qauv nrog ib 2 hli ntawm tes loj tau txo los ntawm 44%.
Cov kev siv ntawm kub uas muaj xws li kev kho tus (pore fusioning) ntawm kev sib txuas ntawm ntau hom ntawm cov hlau lossis alloys. Rau aurospace, kho mob, thiab cov ntawv thov marrine, nws yog qhov tsim nyog los siv cov thev naus laus zis los txhim kho cov khoom siv thiab nce ntxiv lub neej. Thiab ib qho kub yog lub tshuab nias tau tuaj yeem pabcuam ntau lub tshuab luam ntawv.
Lub anisotropy ntawm cov pob txha lov ntawm 3D luam tawm cov tshuab kub siab cuam tshuam nrog cov qoob loo morpace, uas yog qhov chaw ua haujlwm zoo li morpathology thiab thaj chaw ntawm cov theem nag. Tom qab cov tshiab tsim kub yog kev siv lub zog - Kev siv hluav taws xob ntau ntxiv rau cov qib siab thiab 61 teev, uas tau raws li cov cai ntawm cov qauv.
Txawm hais tias kub istostatic nias tuaj yeem tshem tawm sab hauv kev tsis zoo, thiab tsis haum rau ib feem ntawm cov xwm txheej, thiab tsis haum rau cov txiaj ntsig ntawm kub ntawm kub astatic nias. Kev vam khom rau kev ua haujlwm tom qab los daws cov tshuab hluav taws xob sab hauv tsuas yog ib txoj kev txhim kho kev siv, rau cov kev taw qhia ntawm tsis muaj qhov tsis xws luag.
