T73 Tlhaloso ea Botsofali ba Maiketsetso bakeng sa Lipoleiti, Li-Extrusions le Forgings

Har'a lisebelisoa tsa aluminium bakeng sa likoloi tsa sefofane naheng ea China, 7A09 alloy ke e 'ngoe ea li-alloys tse ratoang haholo bakeng sa likarolo tse kholo tsa meralo. Lihlahisoa tse feliloeng tse fumanehang li kenyelletsa lipoleiti, likhoele, mekoallo, li-profiles, li-tubes tse teteaneng, betloas, joalo-joalo Sebopeho sa lik'hemik'hale se na le kahlolo e molemo ho feta ea 7A04 alloy, kahoo e na le ts'ebetso e phahameng ka ho fetisisa 'me e fetoha e' ngoe ea lisebelisoa tse ka sehloohong tsa moqapi. Sebopeho sa eona sa lik'hemik'hale (boima%): 0.5Si, 0.5Fe, (1.2-2.0) Cu, 0.15 Mn, (2.0-3.0) Mg, (0.16-0.30) Cr, (5.1-6.1) Zn, 0.10Ti, litšila tse ling ka bonngoe ke 0.05, kakaretso ea 0.10, 'me tse ling kaofela ke Al.

7A09 alloy e na le thepa e ntle ea ho bopa libakeng tsa kalafo ea annealed le tharollo. Ka mor'a botsofali ba maiketsetso, thepa ea ho theha e fokotsehile, 'me ho thatafala ha fracture hoa khotsofatsa sebakeng sa T6; le hoja matla a tlas'a boemo ba T73 overaging a le tlase ho feta sebakeng sa T6, E na le khanyetso e ntle ea khatello ea maikutlo ea ho senya 'me e na le boima bo phahameng. Lisebelisoa tsa T76 li na le khanyetso e phahameng ea spalling le corrosion. T74 e na le matla a phahameng le ho hanyetsa khatello ea maikutlo ho senya ho phunyeha ka nako e le 'ngoe.

The tensile strength Rm of 7A09 alloy e phahame ho feta ea 2A12 le 2A14 aluminium alloys, 'me khatello ea eona ea khatello ea khatello ea maikutlo e boetse e phahame ho feta ea bona. Ka hona, tšebeliso ea eona ho etsa likarolo tsa lifofane ha e na phello e kholo ea ho fokotsa boima ba 'mele feela, empa hape e na le tšireletso e phahameng. Ka hona, matla a eona a mokhathala ha a e-s'o eketsehe ka ho loketseng. Ka hona, hoa hlokahala ho nahana ka taba ena ka botebo ha ho etsoa lisebelisoa tse nang le mokhathala o mongata haholo. Ha mocheso o phahama, matla a 7A09 alloy a fokotseha ka potlako, kahoo mocheso oa eona o sebetsang ha oa lokela ho feta 125 ° C.

Tlhaloso e sa fellang ea annealing ea 7A09 alloy: 290℃——320℃, 2h——4h, moea o pholileng; tlhaloso e feletseng ea annealing: (390℃——430℃)/(0.5h——1.5h), ka ≤30℃/h Sekhahla sa ho pholisa se ka tlase kapa se lekana le 200℃, ebe se pholile moea ka ntle ho sebōpi.

Mocheso oa phekolo ea tharollo ea motsoako ona ke 460 ℃-475 ℃, empa mocheso oa phekolo oa letlapa le koahetsoeng ke aluminium e lokela ho ba ka tlaase ho moeli o ka tlaase, eseng makhetlo a fetang 2, e le ho thibela likarolo tsa motsoako ho phunyeletsa aluminium- clad layer le ho fokotsa ho hanyetsa ha kutu ea thepa. Sebaka sa ho futhumatsa ke mocheso oa kamore, metsi a futhumetseng kapa mokhoa o mong o loketseng, phetisetso ha ea lokela ho feta 15s. Mocheso oa ho sebetsa oa poleiti ea T6 ke (135℃±5℃)/(8h—16h), le bakeng sa lisebelisoa tse ling, ke (140℃±5℃)/16h. Sheba tafole bakeng sa litlhaloso tsa botsofali tsa maiketsetso tsa lipoleiti tsa T73, lisebelisoa tse extruded le forgings.

Thepa ea ho qhibilihisa ea 7A09 alloy e tšoana le ea lisebelisoa tse ling tse entsoeng ka aluminium. Mocheso o qhibilihang ke 710 ℃-750 ℃, 'me mocheso oa ho lahla ke 710 ℃-735 ℃. Boholo ba ingot bo nyane mme mocheso o tlase oa ho lahla o khethoa. Mocheso o qhibilihang oa alloy ke 477 ℃. ——638°C.

7A09 alloy ke motsoako oa bohlokoa oa sebopeho sa aluminium bakeng sa khatello ea maikutlo. E 'nile ea sebelisoa haholo ha ho etsoa lifofane, lifofane tsa libomo tse mahareng, lifofane tsa lipalangoang le bakoetlisi. E sebelisetsoa ho etsa hore nko e koale Lisebelisoa likarolo, maballo a mapheo a ka pele, maballo, le boema-kepe ba fuselage. Matsoho le litšiea tse tšehetsang foreimi, li-partitions, likhopo, manonyeletso a mantlha, mehatla e bataletseng e kaholimo le e tlase ea lebota, likarolo tsa sistimi ea hydraulic, lithupa tsa piston tsa oli ea hydraulic, li-cylinders tse kahare le kantle le likarolo tse ling tsa bohlokoa.

The fracture toughness (Kc, N/mm2,) ea 7A09-T73 alloy e phahame ho feta ea thepa ea T6, 'me sekhahla sa eona sa ho hōla ha crack se tlase ho feta sa thepa ea T6. Matla a eona a mokhathala a boetse a molemo ho feta a thepa ea T6, 'me conductivity ea eona ea mocheso e boetse e phahame ho feta ea thepa ea T6. Mocheso o khethehileng oa mocheso oa 7A09-T6 alloy ho 50 ° C ke 888J / (kg. ° C), 'me mocheso oa mocheso oa kamore ke 18.5MS / m. Ntle le ts'ebetso ea ho phatloha ha khatello ea maikutlo, khanyetso e akaretsang ea corrosion ea 7A09 alloy e lekana le ea 2A12 alloy. 7A09 alloy e na le maikutlo a ho sithabela ha kutu ho ea ka lehlakoreng la ST, 'me moeli oa khatello ea maikutlo ho LT le L directions o moholo ho feta 300N / mm2, kahoo khatello ea khatello ea khatello ea maikutlo ka litsela tsena tse peli e lekane ho finyella litlhoko tsa tšebeliso. Haeba tlhokahalo e phahame, lisebelisoa tsa T73 li ka sebelisoa. Matla a matla a Rm a thepa sebakeng sena a batla a le tlase ho 10% ho feta a thepa ea T6, empa khatello ea khatello ea khatello ea kelello e senya boleng ba tataiso ea LT e kholo ho feta ea 300N / mm2.

Bakeng sa likarolo tse hlokang ts'ebetso ea matla le khatello ea maikutlo, lisebelisoa tsa mmuso tsa T74 li lokela ho sebelisoa. The stress corrosion cracking monyako oa 7A09-T74 alloy die forgings ke 210N/mm2. Mehato e thibelang ho bola ea 7A09 alloy e kenyeletsa anodic oxidation, phekolo ea lik'hemik'hale e thibelang ho bola le ho penta.

Sebopeho sa motsoako oa 7A09 se na le tharollo e tiileng ea α-Al le likaroloana tsa karolo ea bobeli. Karolo ea bobeli e na le mefuta e meraro: mofuta oa pele ke metsoako ea intermetallic e entsoeng nakong ea alloy solidification, e kang Al7FeCR, Al3Fe, le Mg2Si. Boholo bo batla bo le boholo. E pshatleha ka likotoana ebe e aroloa ka lihlopha. Boholo ke 0.5μm-10μm. Ha e qhibilihe ka tharollo e tiileng ha e futhumetse 'me e fokotsa ho tiea ha thepa. Mofuta oa bobeli ke likaroloana tse nang le chromium tse kang Al2CrMg2, e leng li-ingots tse nang le homogenized 'me E kenngoa ka tharollo e tiileng nakong ea ho futhumatsa pele e sebetsa,' me boholo ba eona ke 0.05μm-0.5μm, e nang le tšitiso e kholo ho ts'ebetso ea recrystallization le kholo ea lijo-thollo tsa thepa; mofuta oa boraro ke mohato oa ho matlafatsa botsofali, e leng phekolo e tiileng ea tharollo. Ho kenyelletsa tharollo e tiileng le ho tsofala ho tsoa ho tharollo e tiileng ke lintlha tsa bohlokoa tse amang thepa ea thepa. Likarolo tse matlafatsang tsa thepa ea mmuso oa T6 haholo-holo sebaka sa GP ≤4nm, likaroloana tse ka sehloohong tse matlafatsang tsa thepa ea T74 ke karolo ea phetoho η'of 5nm-6nm, mohato o matlafatsang oa thepa ea T73 ke mohato oa phetoho η'of 8nm-12nm le 20nm-80nm Η likaroloana.

Sebopeho sa thepa ea 7A09-O e lekana le ea motsoako oa 2A12-O, 'me e na le sebopeho se setle ho 180 ° C-370 ° C; sebopeho sa thepa e ncha e tingoeng e batla e tšoana le ea motsoako oa 2A12. Letlapa le tima ka mocheso oa kamore bakeng sa 4h Ho ntse ho e-na le sebopeho se setle ka hare, le nako ea ho qhoqhoa ho boloka sebopeho: 24h ho 0 ℃, 3d ho -7 ℃, 7d ho -18 ℃.

Mocheso oa forging oa 7A09 alloy ke 320 ° C-440 ° C, 'me mocheso oa ho bula o lokela ho ba ≤400°C. Ho phahama haholo ho tla baka brittleness e chesang, haholo-holo nakong ea forging mahala. 7A09 alloy ha e bonolo ho tjheseletsa, esita le ho tjheseletsa ho hanyetsa ha ho molemo joaloka motsoako oa 2A12. Forgings e ka tima ka metsing a chesang a ≤80 ℃. Motsoako oa 7A09 ka mor'a ho tima le phekolo e sebetsang e na le machinability e ntle.

Kopanya le sengoloa sena: Sebopeho se Ratoang sa Lifofane Aluminium Alloy 7A09

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