Yog vim li cas Thaum tshav kub kub kho teeb meem rau titanium
Titanium alloy kev ua tau zoo nyob ntawm ob qho tib si tsim thiab kev kho cua sov. Annealing yog qhov kev kho mob ntau tshaj plaws vim tias nws txo qis kev ntxhov siab sab hauv, rov ua kom cov ductility, stabilizes microstructure thiab npaj cov khoom siv rau kev tsim los yog machining. Nkag siab txog theem hloov pauv tus cwj pwm - tshwj xeeb tshaj yog alpha-rau-beta transformation thiab beta transus kub - yog lub hauv paus rau txhua txoj kev annealing tau piav qhia hauv qab no.
1. Kev Nyuaj Siab-Kev Ntxub Ntxaug
Kev ntxhov siab-relief annealing tshem tawm cov kev ntxhov siab sab hauv uas qhia los ntawm kev ua haujlwm, txias ua haujlwm lossis vuam yam tsis hloov pauv qhov ua haujlwm microstructure. Qhov kub yog tuavhauv qab qhov kub ntawm recrystallization, feem ntau 450-650℃rau qib titanium. Tuav lub sij hawm nyob ntawm seem thickness, ua ntej ua keeb kwm thiab yuav tsum tau℃ntawm nyem. Vim tias qhov kub thiab txias tsis tshua muaj, lub zog thiab ductility tau khaws cia ntau. Rau cov rooj sib txoos welded, kev ntxhov siab kuj txo qis kev pheej hmoo ntawm kev cuam tshuam thaum lub sijhawm ua haujlwm tom ntej.
2. Ordinary (Mill) Annealing
Mill annealing yog tus qauv kev kho mob siv rau semi-cov khoom tiav ua ntej xa khoom. Nws tshem tawm cov kev ntxhov siab hauv kev tsim khoom thaum khaws cov qib muaj zog uas txaus siab rau cov kev qhia tshwj xeeb. Qhov ntsuas kub yog piv rau, lossis qis dua me ntsis, qhov ntsuas kub ntawm recrystallization, thiab cua txias feem ntau yog cua txias. Qhov kev kho mob no sib npaug lub zog thiab ductility rau feem ntau cov lag luam alpha thiab alpha-beta alloys thiab yog li cov xwm txheej uas tau hais hauv cov ntaub ntawv pov thawj.
3. Tag Nrho (Recrystallization) Annealing
Tag nrho annealing kiag li tshem tawm ua hauj lwm hardening, stabilizes tus qauv thiab maximizes plasticity los ntawm recrystallization. Qhov kub yog xaivnruab nrab ntawm qhov ntsuas kub recrystallization thiab beta transus. Tshaj qhov transus yuav tsum raug zam: nws txhawb nqa ib coarse Widmanstätten (Weiss) qauv thiab degrades lub alloy lub mechanical zog. Vim tias alpha, alpha-beta thiab ze ntawm-beta alloys teb txawv, qhov kub thiab txias txias yog qib- tshwj xeeb.
4. Duplex Annealing
Duplex annealing txhim kho plasticity, tawg toughness thiab microstructural stability, thiab feem ntau yog siv rau cov cua sov-tiv taus titanium alloys uas yuav tsum tuav ruaj khov nyob rau hauv ntev -lub sij hawm siab - kub ntxhov siab. Cov txheej txheem muaj ob theem:
Thawj (siab-kub) annealing:ntawm los yog me ntsis saum toj no lub recrystallization tiav qhov kub thiab txias, ntev txaus rau ua kom tiav recrystallization tsis muaj ntau cov nplej loj hlob, thaum tswj lub ntim feem ntawm thawj alpha theem.
Thib ob (qis{0}}kub) annealing:Hauv qab qhov ntsuas kub ntawm recrystallization nrog ntev tuav, tso cai rau metastable beta theem khaws cia tom qab cua txias kom decompose rau hauv qhov zoo, ruaj khov alpha + beta sib tov.
Qhov tshwm sim yog cov qauv zoo sib xws nyob ze rau qhov sib npaug, nrog kev txhim kho kev tiv thaiv rau cov cuab yeej degradation ntawm kev pabcuam kub.
5. Isothermal Annealing
Isothermal annealing muab qhov zoo tshaj plaws ua ke ntawm plasticity thiab thermal stability, thiab suitsob-theem (alpha{1}}beta) alloys nrog cov ntsiab lus siab ntawm beta-stabilizing cov ntsiab lus. Tom qab cua sov saum lub recrystallization kub thiab tuav, lub workpiece yog xa ncaj qha mus rau lub qhov cub thib ob ntawm qhov kub thiab txias (feem ntau 600-650 degree), tuav nyob rau ntawd, thiab ces cua - txias rau chav tsev kub. Kev ua kom txias txias tso cai rau theem beta hloov pauv raws li kev tswj hwm, ua kom zoo, zoo ib yam alpha + beta qauv.
Annealing Txoj Kev Xaiv
| Txoj kev | Qhov kub thiab txias | Lub hom phiaj | Qhov Zoo Tshaj Plaws Rau |
|---|---|---|---|
| Kev ntxhov siab | 450-650 degree | Tshem tawm cov kev ntxhov siab seem | Welded thiab txias- ua haujlwm |
| Mill annealing | Nyob ze recrystallization | Balanced zog / ductility | Sheet, bar, tube stock |
| Tag nrho annealing | Recrystallization rau hauv qab beta transus | Qhov siab tshaj plaws plasticity, ruaj khov qauv | Cov khoom ua haujlwm hnyav |
| Duplex annealing | Ob -theem, siab + qis | Toughness thiab stability | Thaum tshav kub kub-resistant alloys |
| Isothermal annealing | Siab + 600–650℃tuav | Qhov zoo tshaj plaws plasticity thiab thermal stability | Beta-nplua nuj alpha-beta alloys |
Rau Ti-6Al-4V (TC4), milling annealing yog ua nyob rau ntawm 700-790℃tom qab cua txias, thaum tov kev kho mob thiab kev laus (nyob ib ncig ntawm 930-955℃tov, dej quench, ces 480-595℃laus) yog siv thaum muaj zog ntau dua. Ib txwm paub meej tias lub voj voog tiag tiag tiv thaiv cov kev qhia tshwj xeeb (ASTM B265, ASTM B348, AMS 2801 lossis cov qauv tshwj xeeb alloy) vim tias beta transus kub sib txawv nrog cov alloy muaj pes tsawg leeg.
Cov lus pom zoo
Tswj cua sov cua; titanium absorbs oxygen thiab nitrogen ntawm qhov kub thiab txias, tsim cov ntaub ntawv alpha brittle uas yuav tsum tau muab tshem tawm tom qab kev kho mob.
Siv cov thermocouples txuas nrog lub load thiab siv tau qhov sib xws ua ntej ua qhov tseem ceeb.
Sau tag nrho lub voj voog (kub, sijhawm, tus nqi txias) ntawm lub tshav kub- daim ntawv pov thawj kho mob rau traceability.
Rau cov ntu nyias, siv cov cua txias kom tsis txhob muaj cov qoob loo ntau dhau; rau cov seem hnyav, ncua sij hawm tuav proportionally.
