Kev loj hlob ntawm solidification technology ntawm peev casting

1. Sequential solidification technology lub thiaj li hu ua sequential solidification technology yog txheej txheem txheej txheem uas tso cai rau cov cua sov ntawm cov kua hlau yuav tsum tau tsiv mus nyob rau hauv lub inevitable kev taw qhia, los yog los ntawm lub ceev ceev solidification ntawm cov kua hlau rau ib tug tej lub hom phiaj, thiaj li hais tias txoj kev loj hlob. (solidification) ntawm cov nplej yog nres mus rau lub hom phiaj uas yuav tsum tau zam, thiab thaum kawg lub casting nrog bi-directional grain qauv los yog ib tug siv lead ua qauv yog tau. Vim qhov kev txhim kho txuas ntxiv ntawm kev ua kom txias thiab tswj kev siv tshuab, qhov kev siv ntawm cov cua kub extrusion thiab lub hom phiaj ntawm lub hom phiaj yog txhim kho tas li, kom qhov kub thiab txias gradient nyob rau hauv cov kua theem nyob rau hauv pem hauv ntej ntawm cov khoom-kua interface yog nce. Qhov no tsis tsuas yog txhim kho lub hom phiaj ntawm txoj kev loj hlob ntawm cov nplej, tab sis kuj ua rau cov qauv sib luag thiab ncaj, thiab ncua sij hawm rau thaj tsam ntawm kev taw qhia. Lub tshuab ua kom muaj zog sib txuas tau siv dav hauv kev tsim cov forged high-temperature alloy gas turbine blades, Vim hais tias lub tshuab ua haujlwm ntawm cov qauv tsim raws cov kev taw qhia zoo heev, cov hniav ua haujlwm kub tau zoo heev, thiab kev ua haujlwm ntawm lub cav aviation. yog txhim kho. Qhov nres ntawm kev siv tshuab ua kom muaj zog yog los tsim cov khoom siv lead ua ib leeg, xws li ib leeg siv lead ua turbine hniav, uas muaj kev ua haujlwm siab dua, thermal qaug zog lub zog, creep lub zog thiab corrosion tsis kam tshaj li cov khoom sib txuas ua ke ntawm cov khoom siv lead ua. Kev txais yuav ntawm hom high-temperature alloy single-crystal blades rau aviation actuators tau ua kom muaj zog thiab ua haujlwm zoo ntawm aviation actuators, thiab txhim kho lawv txoj haujlwm zoo.

2. Rapid solidification technology yog hais txog cov txheej txheem ntawm kev hloov cov kua alloy mus rau hauv cov khoom muaj zog nyob rau hauv lub txias txias (103-109 K / s) uas yog sai npaum li cas ntawm cov cua txias (10-4-10k / s) nyob rau hauv lub txheej txheem txheej txheem. Nws ua rau cov khoom siv alloy kom muaj cov qauv zoo thiab ua haujlwm zoo, xws li cov nplej zoo heev (feem ntau < 0.1-0.01="" um=""> lossis txawm nanometer nplej), qhov tsis zoo ntawm cov khoom sib cais thiab ultra-fine precipitated theem nrog siab sib cais, siab zog thiab siab toughness ntawm cov khoom. Lub tshuab solidification ceev ceev tuaj yeem ua rau cov kua hlau sib cais los ntawm cov txheej txheem crystallization (nucleation thiab kev loj hlob) thiab indirectly tsim cov khoom siv nrog amorphous layout, uas yog, lub thiaj li hu ua iav hlau. Hom amorphous alloy no tau siv dav vim tias nws qhov kev teeb tsa ntev-ntev tsis zoo thiab tshwj xeeb hluav taws xob, sib nqus, electrochemical thiab mechanical functions. Piv txwv li, nws yog siv los tswj qhov chaw tuag ntawm cov khoom siv ntawm lub transformer, cov khoom siv ntawm lub taub hau hlau nplaum ntawm lub computer thiab cov khoom ntawm cov khoom tseem ceeb, cov khoom siv ntawm fiber ntau vuam, thiab lwm yam. Ceev ceev solidification yog them nyiaj ntau thiab ntau dua. saib xyuas.

3. Lwm txoj kev txhim kho hauv kev npaj thiab kev sib koom ua ke ntawm cov khoom siv sib xyaw yog kev npaj cov khoom sib xyaw. Lub npe hu ua cov ntaub ntawv sib xyaw yog cov khoom siv nrog cov haujlwm tshwj xeeb uas nyiam cov theem kev txhawb zog lossis cov khoom tshwj xeeb hauv cov hlau tsis muaj hlau lossis hlau matrix, thiab los ntawm kev tswj xyuas kom ruaj khov, cov theem txhawb zog yog dispersed los yog npaj raws li qhov xav tau. Vim hais tias cov matrix ntawm cov khoom sib xyaw muaj cov cuab yeej tawg siab thiab muaj qhov muaj zog ntawm cov theem, nws tuaj yeem pom cov haujlwm sib txawv ntawm cov khoom siv hauv ib-theem, xws li lub zog siab, kev ua haujlwm kub zoo heev thiab kev ua haujlwm tsis zoo. Muaj ntau txoj hauv kev los npaj cov ntaub ntawv sib xyaw tau tsim, xws li cov txheej txheem sib xyaw ua ke txuas ntxiv rau kev npaj cov khoom sib xyaw ua tus kheej. Pawg no yuav raug siv ntau thiab ntau dua.

4. Semi khoom forging semi khoom hlau forging tshuab tau nkag mus rau hauv kev lag luam siv theem tom qab ntau tshaj 20 xyoo ntawm kev tshawb fawb thiab kev loj hlob. Yog vim li cas yog vim li cas thaum lub sij hawm solidification txheej txheem ntawm cov kua hlau, lub khaus nplawm yuav tsum tau nres (tshuab, electromagnetic los yog lwm txoj kev yuav tsum tau saws), yog li ntawd lub dendrite sau skeleton uas yog ib qho yooj yim yuav tsum tau tsim los ntawm nrov casting yog tawg rau. tsim cov qauv granular cais, kom cov kua semi-solid hlau tuaj yeem tsim tau. Nws muaj qee yam kev txav mus los, thiab tom qab ntawd cov txheej txheem kev sib sau dav dav xws li tuag casting, extrusion thiab tuag forging tuaj yeem siv los tsim thiab tsim cov blanks lossis castings. Lub semi-solid hlau forging tau kov yeej qhov yuam kev thiab fallacies xws li shrinkage qhov, porosity, porosity thiab dimensional yuam kev uas yooj yim tshwm sim nyob rau hauv cov tsoos forging. Nws muaj ntau yam zoo xws li tsis tshua muaj kev kub kub, ncua kev tuag lub neej, txuag lub zog, txhim kho qhov chaw tsim khoom thiab cov xwm txheej, txhim kho casting zoo (txo cov porosity thiab shortening solidification), thiab txo cov nyiaj siv ua haujlwm. Semi khoom hlau sib sau tshuab yuav dhau los ua ib qho ntawm cov cuab yeej tsim khoom ze nrog kev loj hlob zoo nyob rau hauv lub xyoo pua 21st.