Kev kho tsis zoo ntawm titanium alloy forgings
a.Segregation hom kho raws
Ntxiv rau greg cais, β chaw, titanium nplua nuj cais thiab sawb strip cais, qhov txaus ntshai tshaj plaws yog qhov sib txawv α sib cais ruaj khov (I-hom greg cais), uas feem ntau nrog cov qhov me me thiab kab nrib pleb, muaj cov pa oxygen, nitrogen thiab lwm yam gases, thiab yog nkig. Kuj tseem muaj cov nplua nuj aluminium α segregation ruaj khov (hom II greg cais), uas tseem muaj qhov tsis zoo txaus ntshai vim cov kab nrib pleb thiab nkig, thiab yuav txo qhov thermal stability thiab lwm yam khoom ntawm lub alloy.
b.inclusions
Muaj cov kab ke nyob rau saum npoo ntawm qhov khoob, thiab cov kab nrib pleb feem ntau tsim nrog kev suav thaum lub sijhawm forging, lossis cov teeb meem pom tseeb txawv teb chaws tshwm sim tom qab kev xeb ntawm lub forging, feem ntau ntawm cov melting taw tes thiab qhov ntom ntom cov hlau suav nrog. Lub siab yaj tas thiab cov ntsiab lus ntom ntom nyob rau hauv titanium alloy tsis muaj siab melted thiab sab laug hauv qhov loj (xws li molybdenum suav nrog). Kuj tseem muaj cov cuab yeej carbide chips sib xyaw rau kev sib tsoo cov khoom nyoos (tshwj xeeb cov khoom siv dua tshiab) lossis cov txheej txheem tsis zoo electrode vuam (nqus cov khoom siv hluav taws xob uas siv hluav taws xob feem ntau siv rau titanium alloy smelting, xws li kev kub siab suav tawm ntawm tungsten arc vuam), xws li tungsten suav nrog, ntxiv rau titanium suav, thiab lwm yam, xws li titanium alloy zam txim nrog kev suav nrog tsis tso cai siv.
c.holes
Lub qhov yuav tsis nyob ib leeg, tab sis kuj yuav muaj nyob rau hauv ntau ntawm qhov ntom ntom, uas yuav ua kom lub voj voog qes ua kom qis qis thiab ua rau lub zog poob ua ntej.
d.crack
Feem ntau nws hais txog forging tawg. Titanium alloy muaj viscosity loj, ua tsis tau zoo, thiab cov thermal conductivity tsis zoo. Yog li ntawd, nyob rau hauv tus txheej txheem ntawm forging deformation, vim qhov loj ntawm kev sib txhuam, pom tseeb sab hauv deformation nonuniformity thiab loj kub sib txawv nruab nrab ntawm sab hauv thiab sab nraud, nws yooj yim los tsim cov xov txiav (cov kab) hauv cov forging. Hauv cov xwm txheej loj, cov kab nrib pleb tshwm sim raws cov kev taw qhia txog kev ntxhov siab tshaj plaws deformation.
e.overheating
Titanium alloy muaj cov thermal conductivity tsis zoo. Ntxiv rau qhov overheating ntawm kev zam txim lossis cov khoom nyoos vim muaj cua sov tsis raug thaum lub sijhawm ua haujlwm kub, nws tseem yooj yim mus rau qhov kub tshaj vim cov cua sov ua haujlwm thaum deformation thaum ua haujlwm, uas ua rau microstructure hloov thiab siab dhau ntawm Widmanstatten tus qauv.
Txhawm rau kom ntseeg tau qhov zoo ntawm titanium alloy tsis nco qab, ntxiv rau kev tswj hwm nruj ntawm cov khoom nyoos, peb kuj yuav tsum xyuam xim rau kev kuaj ultrasonic ntawm cov forging blanks thiab semi-tiav cov khoom lag luam kom tiv thaiv qee qhov deformation thiab lub cev lub cev ntawm qhov tsis xws luag uas yuav hloov hauv cov txheej txheem cua kub tom ntej.
