Kev cuam tshuam ntawm extrusion cua sov txheej txheem ntawm titanium yeeb nkab fittings
Raws li cov yam ntxwv ntawm titanium alloy, qee cov kws tshawb fawb tau siv txoj kev extrusion los tsim TA15 cov yeeb nkab ua haujlwm kub, thiab tau kawm txog qhov cuam tshuam ntawm extrusion cua sov kub, annealing system thiab extrusion piv ntawm microstructure thiab cov khoom ntawm extruded titanium yeeb nkab.
1.Txoj kev thiab txoj kev:
Cov txheej txheem yog: titanium pas nrig → kev npaj ntawm ingot → cladding → extrusion → straightening → pickling → annealing → machining → soj ntsuam → sampling.
2.Effect ntawm annealing system ntawm Microstructure thiab cov khoom ntawm cov kav dej:
Cov nyhuv ntawm Annealing ntawm lub microstructure thiab cov khoom ntawm cov kav dej tau kawm thaum lub extrusion kub yog 950 ℃ thiab qhov extrusion piv yog 10.2.
1. Cov teebmeem ntawm qhov kub thiab txias annealing tuav lub sijhawm ntawm Microstructure thiab cov khoom ntawm cov kav dej:
Cov txiaj ntsig tau pom tias nce qhov kub ntawm qhov annealing tsis tshua muaj txiaj ntsig rau cov khoom ntawm cov kav dej extruded; Lub sij hawm ncua sij hawm annealing yuav ua rau rov qab thiab recrystallization ntau dua, thiab qhov tshwm sim yog tias lub zog ntawm cov hlau yog txo thiab cov yas zoo dua; Lub sij hawm annealing ntawm TA15 titanium alloy muaj me ntsis cuam tshuam rau lub microstructure thiab cov khoom. Yog li, raws li cov khoom siv dav dav thiab cov qauv metallographic cov yam ntxwv xav tau los ntawm kev tsim cov yeeb nkab, cov yeeb nkab extruded dawb paug yog extruded ntawm 950 ℃, extrusion piv yog 10.2, cov yeeb nkab extruded yog 800 ~ 850 ℃, 1 ~ 2H, AC annealing. , thiab lub hom phiaj tseem ceeb ntawm annealing yog txhawm rau tshem tawm cov kev ntxhov siab sab hauv los ntawm kev ua cov tawv tawv hauv cov txheej txheem kub extrusion los ntawm kev rov qab thiab recrystallization.
2. Cov txiaj ntsig ntawm qhov ntsuas cua txias ntawm cov khoom siv kho tshuab thiab microstructure ntawm cov kav dej:
Cov txiaj ntsig tau pom tias cov khoom siv kho tshuab ntawm cov kav dej cua txias yog qhov ruaj khov thiab tsim nyog. Qhov txias ntawm cov kav dej extruded tom qab annealing yog cua txias: los ntawm qhov kev xav ntawm microstructure thiab cov khoom, vim qhov tsis sib xws microstructure nyob rau hauv cov txheej txheem ntawm kub extrusion, dynamic recrystallization tshwm sim nyob rau hauv tus txheej txheem ntawm kub extrusion. Cov cua txias me me tom qab kub extrusion ua rau qhov ntom ntawm cov qauv tsis xws luag hauv cov alloy kuj qis, thiab tom qab annealing tsis muaj kev cuam tshuam zoo rau nws cov khoom. Thiab vim hais tias thaum nyem nyob rau hauv ob-theem cheeb tsam, α Phase harmony β Cov nplej yog flattened thiab elongated raws li deformation kev taw qhia. Nyob rau ntawm 700 ℃, lub microstructure yeej khaws cov kub extrusion qauv, thiab muaj ib tug loj tus naj npawb ntawm cov thawj hais nyob rau hauv lub metallographic qauv ntawm 800 ℃ α Cov theem thiab cov qauv yog spheroidized equiaxed ib + intergranular β Vim qhov qeeb kev siv cov cua txias, β Sib npaug tag nrho hloov mus rau α Phase, recrystallization tau ua tiav ntawm 850 ℃, thiab cov qauv tau txais yog + β Phase, thiab cov me nyuam mos α Tib lub sijhawm, cov nplej tau ua kom zoo dua. Xav txog cov khoom siv kho tshuab thiab microstructure ntawm cov yeeb nkab extruded, nws tau txiav txim siab tias TA15 yeeb nkab yog annealed ntawm 800 ~ 850 ℃ rau 1 ~ 2H hauv AC, uas yog qhov zoo rau kev ua haujlwm siab ntxiv ntawm titanium yeeb nkab. Yog li ntawd, cov txheej txheem txheej txheem yog tsim nyog.
