GH4049 alloy hnav-tiv taus phaj yog Ni-CR-Co-raws li alloy hnav-tiv taus phaj, zoo ib yam li Soviet Union lub "R929" alloy muaj pes tsawg leeg, yog ib qho ntawm qhov ntxov tshaj plaws ua tiav cov alloy hnav-tiv taus daim hlau hauv Suav teb. GH4049 alloy hnav-resistant phaj yog dav siv nyob rau hauv kev tsim cov turbine hniav ua hauj lwm ntawm 900 degree rau nws zoo kub kub microstructure stability thiab zoo heev kub siab kev ua tau zoo. Txawm li cas los xij, GH4049 alloy yog cov khoom siv hluav taws xob tsis zoo hnav-tiv taus phaj, nrog Al thiab Ti cov ntsiab lus siab txog 5.1% ~ 6.3%, tsis zoo malleability thiab nyuaj heev hauv forging. Nyob rau hauv cov txheej txheem ntawm cov hniav forging, lub zos coarse siv lead ua tsis xws luag feem ntau tshwm nyob rau saum npoo, thiab cov ntxhib crystal teeb meem nyob rau hauv nruab nrab rov qab nto yog qhov tseem ceeb tshaj plaws, uas tsis tau zoo daws tau ntev. Nws tau dhau los ua ib qho ntawm cov teeb meem plaguing hniav manufacturers.
Grain loj yog ib qho tseem ceeb cov qauv parameter ntawm alloy hnav-resistant phaj, uas yog ze rau cov khoom siv technology thiab muaj kev cuam tshuam zoo rau txhua yam khoom ntawm forgings. Txhawm rau kom tau txais lub zog ntev ntev thiab nkag siab cov khoom ntawm alloy hnav-resistant phaj hniav, nws yog ib qho tsim nyog yuav tsum muaj cov qauv zoo sib xws thiab me ntsis coarse grain qauv. Txawm li cas los xij, cov duab ntawm cov hniav forging yog complex, cov hniav lub cev profile yog nyias, cov hlau tsis yooj yim rau ntws nyob rau hauv nruab nrab ntawm cov txheej txheem forging, thiab nws yog ib qho yooj yim mus poob rau hauv ib tug tseem ceeb deformation cheeb tsam los tsim ib lub zos nto ntxhib. siv lead ua. Qhov tseem ceeb deformation yog qhov ua rau lub hauv paus ntxhib siv lead ua nyob rau hauv hnav-resistant alloy phaj forging, yog li nws yog ib qho tseem ceeb heev los faib cov deformation kom tsis txhob muaj qhov tseem ceeb deformation cheeb tsam hauv cov txheej txheem forging ntawm alloy hnav-resistant phaj hniav. Cov nyhuv ntawm kev faib ua ntej forging thiab zaum kawg forging deformation ntawm cov evolution ntawm grain qauv ntawm GH4049 alloy tau kawm nyob rau hauv thiaj li yuav muab theoretical thiab sim hauv paus rau kev tiv thaiv thiab tshem tawm cov ntxhib siv lead ua hauv zos rau ntawm qhov chaw ntawm GH4049 alloy hniav forgings nyob rau hauv ntau lawm. .
Cov khoom siv xeem yog Φ28mm GH4049 alloy kub dov bar, thiab nws cov qauv qub yog equiaxial qauv. Cov nplej loj yog kwv yees li faib ua ob pawg, txog 40μm thiab txog 10μm ntawm cov nplej suav rau 1/2.
Lub preforging thiab zaum kawg forging ib ntus ntawm GH4049 alloy hniav forging txheej txheem cuam tshuam nrog kev faib tawm ntawm deformation. Cov kws tshawb fawb tau tsim lub forging ua ntej thiab zaum kawg forging ob qhov kev ntsuas hluav taws kub, tag nrho ntawm 8 pawg. Kev faib ua ntej forging deformation yog 15%, 15%, 15%, 25%, 25%, 25%, 35% thiab 35%; Qhov kawg forging deformation yog faib li 25%, 35%, 45%, 25%, 35%, 45%, 25% thiab 45%.
Lub billet loj yog Φ28mm × 35mm, thiab cov cua kub yog nqa tawm nyob rau hauv ib tug segmented txoj kev. Cov billets tau ua ntej preheated nyob rau hauv lub qhov cub tiv thaiv ntawm 825 degree, thiab lub sij hawm tuav tau xam ntawm 0.8min/mm. Tom qab ntawd, cov pob zeb tau muab tso rau hauv qhov kub ntawm forging nyob rau hauv 10min thiab ua kom sov, thiab lub sij hawm tuav tau xam ntawm 0.6min / mm, nyob rau hauv uas lub pre-forging kub yog 1170 degree thiab qhov kawg forging kub yog 1175 degree.
Cov khoom siv forging yog J53-300 ob-disc kev sib txhuam xovxwm, uas yog compressed raws radial kev taw qhia ntawm tus qauv, thiab txwv pad yog siv los tswj qhov deformation ntawm qhov khoob. Ua ntej forging, sab sauv thiab sab phaj modules yog preheated txog 300 degree C siv pre-rhuab steel blocks. Lub billet tsis yog coated nrog roj nplua nyeem, thiaj li yuav tshem tawm cov kev cuam tshuam ntawm oxide nyob rau tom ntej forging, oxide nyob rau saum npoo ntawm lub billet yog polished nyob rau hauv lub grinder tom qab pre-forging.
Kev kho cua sov tau txais tom qab forging yog: 1200 degree × 2h / AC +1050 degree × 4h / AC +950 degree × 2h / AC. Metallographic specimens tau pom thiab yees duab ntawm Olympus-PMG3 kab rov tav microscope. Cov qoob loo loj tau ntsuas los ntawm txoj kev transversal. Cov txiaj ntsig kev xeem yog raws li nram no:
(1) Kev faib ua ntej forging thiab zaum kawg forging deformation muaj qhov cuam tshuam loj rau cov qauv nplej ntawm GH4049 alloy. Thaum lub pre-forging deformation yog me me, lub microstructure ntawm alloy tom qab kawg forging deformation yog heev yooj yim mus tshwm coarse siv lead ua thiab grain non-uniformity.
(2) Nws yog qhov yooj yim rau GH4049 alloy kom tau txais cov qauv zoo li qub tom qab loj ua ntej forging deformation thiab tsim nyog kawg forging deformation, yog li nws raug pom zoo tias pre-forging deformation yuav tsum yog li 35% thiab qhov kawg forging deformation yuav tsum ntau tshaj. 25%.
