Txias dov machinability ntawm TC6 titanium alloy phaj

TC6 titanium alloy phaj yog martensitic Ti-Al-Mo-Cr-Fe-Si system ntawm + ob-theem tshav kub-zog titanium alloy nrog zoo kev ua tau zoo, nws nominal muaj pes tsawg leeg yog Ti-6Al-2 .5Mo-1.5Cr-0.5Fe-0.3Si, thiab nws / kev hloov pauv kub ntawm 960 txog 1000 degree . Ntxiv rau qhov zoo ntawm cov titanium alloy zoo tib yam xws li lub zog tshwj xeeb thiab zoo corrosion kuj, cov hlau kuj tseem muaj cov khoom siv zoo txhua yam ntawm chav tsev kub thiab kub, thiab qhov kev pabcuam kub tuaj yeem siab txog 450 degree. Nws yog feem ntau siv nyob rau hauv kev tsim cov aero-engine hniav, turbine disks thiab lwm yam tseem ceeb, thiab nws kuj yuav siv tau nyob rau hauv lub tsim ntawm aircraft spacer thav ntawv, pob qij txha thiab lwm yam. Ntau cov haujlwm tau ua tiav hauv tsev nyob rau hauv kev siv thev naus laus zis thiab kev ua tau zoo ntawm TC6 titanium alloy forgings, castings, hlab thiab tuav, thiab lwm yam, thaum tsis tshua muaj kev tshawb fawb tau ua tiav ntawm TC6 alloy daim hlau. Cov kws tshawb fawb tau txiav txim siab cov txheej txheem tseem ceeb ntawm kev ua haujlwm txias dov ntawm TC6 daim hlau los ntawm kev tswj cov txheej txheem txias dov ntawm TC6 daim hlau, thiab kawm txog kev ua haujlwm txias dov ntawm TC6 daim hlau.

Kev sim TC6 titanium alloy ingot yog tau los ntawm peb lub sij hawm yaj hauv lub tshuab nqus tsev siv hluav taws xob arc rauv, thiab nws qhov kub hloov pauv yog 975-985 degree, thiab cov tshuaj muaj pes tsawg leeg yog (wt.%): Al6.2, Mo2.5, Cr1.4, Fe{{10}}.41, Si0.29, O0.10, Zr<0.01, C<0.01, N<0.01, and Ti remainder. The experimental TC6 ingots were opened in the β-phase region and forged into slabs in the α+β two-phase region. Slabs were hot rolled above the β-transition temperature to open billets, rolled to 3.5 mm in the α+β two-phase zone, and then cold rolled for work-hardening experiments after intermediate annealing and pickling. Processing rate of every 5% increase, from the head of the plate cut 200mm long piece of experimental material, the remaining plates continue to roll, so repeatedly rolled, sampling, until the plate edge cracks or surface cracks. Then the cut 200mm experimental material with different processing deformation was tested, and the thickness, width, edge crack, organization and mechanical properties of the experimental plates were tested.

Qhov kev sim microstructure saum toj no tau pom ntawm Axiovert 200 MAT optical microscope thiab cov khoom siv kho qhov muag tau sim ntawm Instron 5885 tensile kuaj tshuab. Cov txiaj ntsig kev xeem yog raws li nram no:
(1) Los ntawm kev ua haujlwm txias dov hardening nkhaus, nws tuaj yeem pom tias lub zog tensile thiab lub zog tawm los nce nrog kev nce ntawm kev ua haujlwm, thaum lub elongation maj mam txo, uas yog vim qhov nce ntawm dislocation ceev nrog nce ntawm kev ua tus nqi ntawm txias dov thiab intensification ntawm kev ua hauj lwm hardening. Thaum tus nqi ua tiav nce mus txog 27%, lub zog tensile thiab cov txiaj ntsig lub zog nkhaus nyhav mus rau theem, qhia tias nws nkag mus rau theem nyuaj deformation.
(2) TC6 titanium alloy phaj siab tshaj plaws txias dov ua tus nqi tuaj yeem ncav cuag 30.3%, lub sijhawm no lub elongation ntawm cov khoom poob mus rau 5.8%, kev soj ntsuam ntawm lub phaj pib tshwm wrinkles thiab convexity, ntug ntawm cov kab nrib pleb. . Txias dov ua tus nqi ntawm 30.3% thaum qhov dav ntawm qhov sib kis yog 20 hli.