Dab tsi yog qhov cuam tshuam ntawm Clad Rolling txheej txheem ntawm Gr5 Titanium Alloy Sheets?

 

Raws li ib txwm + duplex titanium alloy,Gr5 titanium alloy (Ti-6Al-4V)cov txiaj ntsig los ntawm cladding thiab dov tshuab. Cov thev naus laus zis no siv cov txheej hlau cladding los txhim kho qhov sib xws ntawm dov quab yuam, daws qhov teeb meem ntawm ntug kev tawg thaum lub sij hawm loj txo ntawm titanium alloy. Nws muab txoj hauv kev ua tau rau siab - kev ua tau zoo ntawm cov nplooj ntawv nrog cov thicknesses sib txawv. 0.5mm ultra- daim ntawv nyias feem ntau yog siv rau hauv cov khoom siv thiab cov khoom siv kho mob, thaum 3.0mm nruab nrab -cov ntawv tuab feem ntau yog siv rau hauv cov qauv thauj khoom- cov kabmob. Nyob rau hauv cov txheej txheem cladding thiab dov, txoj kev tshawb no tshawb txog cov txheej txheem microstructure evolution txoj cai thiab txhua yam khoom sib txawv ntawm 0.5mm thiab 3.0mm Gr5 titanium alloy nplooj ntawv, nthuav tawm cov kev sib raug zoo ntawm cov thickness thiab cov txheej txheem kev ua tau zoo.

 

 

Raw Materials thiab Sample Preparation

Muaj-qib Gr5 titanium alloy ingots raug xaiv rau qhov kev sim. Lawv cov tshuaj lom neeg tseem ceeb (feem ntau) yog: Al 5.8%, V 4.2%, Fe 0.15%, O 0.12%, thiab qhov sib npaug yog Ti, uas ua tau raws li cov cai ntawm ASTM B348 tus qauv. Tom qab homogenization annealing ntawm 1050℃( cheeb tsam) rau 4h, lub ingot yog forged rau hauv 15mm -tuab kub- dov dawb paug. Q235 steel phaj (2 hli tuab) tau siv los ua cov khoom siv cladding. Argon arc vuam siv los sib sau ua ke thiab welding titanium alloy dawb paug thiab cladding steel phaj rau hauv lub kaw laminated dov pob, kom ntseeg tau tias cov titanium alloy tsis ncaj qha hu rau huab cua thaum lub sij hawm dov txheej txheem kom tsis txhob oxidation paug.

Differentiated dov txheej txheem rau ob lub hom phiaj thicknesses:

 

• 3.0mm daim ntawv: Cov ntaub qhwv yob tau rhuab thiab rwb thaiv tsev ntawm 930℃(qhov nruab nrab ntawm qhov kub ntawm + duplex cheeb tsam) rau 2h, kub- dov mus rau 3.5mm nyob rau hauv ib lub tshav kub, ces raug recrystallization annealing ntawm 800℃rau 1h kom tshem tawm rolling kev nyuaj siab thiab thaum kawg refine lub thickness {8 hli. los ntawm 2 hla nrog qhov txias dov txo tus nqi ntawm kwv yees li 14%.
• 0.5mm daim ntawv: Siv 3.0mm daim ntawv raws li qhov nruab nrab dawb paug, tom qab txhaj tshuaj blasting, chav tsev kub txias dov txheej txheem tau txais kev pom zoo kom ncav cuag lub hom phiaj thickness los ntawm 20 dhau ntawm kev loj hlob dov nrog tag nrho txo ​​tus nqi ntawm 83%. Tsawg- qhov kub thiab txias kev ntxhov siab annealing ntawm 650℃rau 30min tau ua txhua 5 zaug los tiv thaiv kev tawg thaum dov.

 

Ob lub thicknesses ntawm nplooj ntawv thaum kawg raug rau lub tshuab nqus tsev annealing ntawm 650℃rau 1h kom tshem tawm qhov kawg txias ua hauj lwm kev ntxhov siab thiab ua kom muaj kev ruaj ntseg.

 

Kev sim

Cov khoom siv kuaj: OM & TEM

 

Microstructure characterization tau ua tiav siv OLYMPUS GX71 optical microscope (OM) thiab FEI Tecnai G2 F20 kis tau tus mob electron microscope (TEM). Tom qab sib tsoo thiab polishing, cov qauv tau etched nrog Kroll's reagent (HF:HNO₃:H₂O=1:3:10) rau 5-8s los tso saib cov qauv metallographic. TEM cov qauv tau npaj los ntawm ob npaug tshuaj tsuag electrolytic polishing nrog cov kua ua haujlwm ntawm methanol: nitric acid=3: 1 ntawm -20℃.

Kev ntsuam xyuas cov cuab yeej cuab tam tau ua raws li ASTM E8 / E8M cov qauv ntawm Instron 5969 universal kuaj tshuab rau chav ntsuas kub tensile ntawm tus nqi tensile ntawm 2mm / min. Peb cov qauv sib txuas tau muab coj los siv rau txhua qhov tuab, thiab qhov nruab nrab tus nqi tau siv los ua qhov kawg tshwm sim. Microhardness tau sim siv lub ZWICK/Roell ZHV30 Vickers hardness tester nrog ib tug load ntawm 100g thiab tuav lub sij hawm ntawm 15s. Kaum lub ntsiab lus raug sim rau txhua tus qauv, thiab qhov nruab nrab tus nqi raug coj mus tom qab tshem tawm qhov siab tshaj plaws thiab qhov tsawg kawg nkaus.

 

 

Macrostructure thiab Grain Size

Ob lub thicknesses ntawm titanium alloy los xij muaj cov qauv + duplex, tab sis muaj qhov sib txawv loj ntawm cov nplej loj, theem kev faib tawm thiab tsim cov txheej txheem vim yog tuab (qhov sib txawv ntawm kev siv tshuab).

 

micrograph duab txog 0.5mm & 3.0mmTitanium ntawv

 

Parameter	3.0mm Medium -Thick Sheet	0.5mm Ultra-Thin Sheet
Loj Loj	8 ~ 12μm (Nrog Equiaxed)	2-5μm (Ultra-Zoo)
Phase Distribution	Discontinuous (Strips/Islands)	Nruam (Network + Dispersed Precipitates)
Core Mechanism	Nruab nrab-kub kub dov + nruab nrab txias dov	Loj txo qhov txias dov + qis-kub annealing

 

 

Kev sib piv ntawm Mechanical Properties

Phaj Thickness (mm)	Tensile zog Rm (MPa)	Yield zog Rp0.2 (MPa)	Elongation Tom qab Fracture A (%)	Microhardness HV
3.0	898	840	17.7	260
0.5	1035	980	16.5	320
Kev Txhim Kho Kev Ua Haujlwm (%)	15.2	16.7	-1.2	23.1

 

 

Cov txheej txheem clad dov tuaj yeem npaj tau zoo -Gr5 titanium alloy nplooj ntawv. Muaj qhov sib txawv tseem ceeb hauv microstructure thiab txhua yam khoom ntawm cov ntawv nrog cov thicknesses sib txawv: 3.0mm nruab nrab -cov ntawv tuab nthuav qhia cov qauv equiaxed + strip nrog cov nplej loj ntawm 8-12μm, chav tsev kub tensile zog ntawm 898MPa, thiab elongation tom qab tawg ntawm 17%. 0.5mm ultra- daim ntawv nyias ua ib qho ultra-nplua + network qauv nrog cov nplej loj ntawm 2-5μm, lub zog tensile tau nce mus rau 1035MPa, thiab elongation tom qab tawg yog khaws cia ntawm 16.5%, ua tiav kev sib xyaw ua ke zoo ntawm lub zog siab thiab siab plasticity.

 

Thickness -dominated dov deformation thiab cov txheej txheem tsis yog lub hauv paus ntawm microstructure tswj: kev sib xyaw ua ke ntawm kev txo qis txias dov thiab segmented annealing yog tus yuam sij kom ua tiav cov nplej ultra- kho kom zoo ntawm daim ntawv 0.5 hli, thaum nruab nrab -kub kub dov txias dov thiab cov yam ntxwv ntawm me me refining. 3.0mm ntawv; txheej cladding plays lub luag haujlwm hauv kev txhim kho deformation uniformity thiab inhibiting defect tiam nyob rau hauv kev npaj ntawm ob thicknesses ntawm nplooj ntawv.

 

3.0mm nruab nrab- daim ntawv tuab, nrog cov yas zoo thiab lub zog nruab nrab, yog qhov tsim nyog rau kev thauj khoom -cov khoom siv xws li aerospace structural parts thiab marine engineering pipelines; 0.5mm ultra- daim ntawv nyias, nrog rau nws qhov zoo tshaj plaws lub zog thiab qhov tseeb qhov tseeb, tuaj yeem siv rau hauv siab -kawg teb xws li kev cog qoob loo kho mob (xws li, cov khoom sib koom ua ke) thiab cov khoom sib sib zog nqus ntawm aero- cov hniav.