I-7A04 alloy iyingxubevange ye-Al-Zn-Mg-Cu ekwazi ukumelana nokushisa ekwazi ukumelana nokushisa kwe-aerospace super-hard aluminium alloy, engaphathwa ngokushisa futhi iqiniswe. Ukwakheka kwayo kufakwe kuhlu ku-GB/T3190-2008, futhi ihambisana ne-B95 alloy yeSoviet Union neRussia kanye ne-AlZnMgCu1 yaseJalimane. .5.3.4365 ingxubevange iyalingana, ngoba ngo-1944 ifektri yeSoviet Union yesi-95 yavivinya ngempumelelo lo mkhiqizo owenziwe ingxubevange oqediwe, yingakho kuthiwa i-B95 alloy. Ngo-1957, i-China Northeast Light Alloy Co., Ltd. (eyayikhona ngaleso sikhathi i-Harbin Aluminium Processing Plant) yakhiqiza le ngxube ngosizo lochwepheshe baseSoviet. Amapuleti e-alloy nezinto ezikhishiwe.

Isici esiyinhloko se-7A04 alloy ukuthi amandla ayo okukhiqiza i-Rpo.2 isondelene namandla aqinile we-Rm, i-plasticity yayo iphansi, futhi izwela ekugxilweni kokucindezeleka, ikakhulukazi uma ibhekene nemithwalo yokudlidliza kanye nemithwalo ephindaphindiwe ye-static. Ngokuklama, ukukhiqizwa nokuhlanganiswa kwezingxenye, ukugxila kwengcindezi kanye nezici ezengeziwe zokucindezeleka kufanele kugwenywe ngangokunokwenzeka. I-7A04 alloy ayimelani nokushisa futhi izothamba kakhulu uma izinga lokushisa lokusebenza lingaphezu kuka-125 ℃. Ukumelana nokuqhekeka kwe-stress corrosion cracks of 7A04 alloy workpieces endaweni emfushane enqamulayo (ST) iphansi.

Ukwakheka kwamakhemikhali kwe-7A04 alloy (mass%): 0.50Si, 0.50Fe, (1.4—2.0) Cu, (0.20—0.6) Mn, (1.8—2.8) Mg, (0.1—0.25) Cr, (5.0 ——7.0) ) Zn, 0.10Ti, okunye ukungcola ngakunye kungu-0.05, ingqikithi ngu-0.10, kanti okunye kungu-Al. Ukucaciswa kokunamathisela okungaphelele kwe-7A04 ingxubevange eqediwe kancane kanye namapuleti omkhiqizo amaphakathi, amapheshana, amaphrofayili, amabha namapayipi (290—320)℃/(2—4)h, ukupholisa komoya; ukucaciswa kokucwiliswa okuphelele (390—430)℃/ (0.5-1.5) h, ukupholisa isithando somlilo ukuya ku-≤ 200 ℃ ngenani lokunciphisa izinga lokushisa elingu-≤ 30 ℃/h, ukupholisa komoya esithandweni, noma ukushiswa ku-(320-380). ) ℃ okwe-(1-2) h. Ukuze kuthuthukiswe ukusebenza kahle kwesithando somlilo sensimbi, imboni ivamise ukudonsa ku-400°C-420°C amahora angu-2, ipholise ibe ngaphansi kuka-150°C ngesilinganiso sokupholisa esingu-30°C/h, bese ipholisa umoya. isithando somlilo.

Izinga lokushisa lokwelapha isixazululo lale alloy lingu-465℃—475℃, licinywa emanzini ekamelweni lokushisa, futhi isikhathi sokudlulisa sifushane kuno-25s. Izitshalo zokucubungula i-aluminium ngokuvamile zamukela ukwelashwa kwesixazululo okuhloswe kakhulu kanye nokucaciswa kokwelashwa kokuguga ngokuya ngemikhiqizo ehlukene kanye nemikhiqizo yokucaciswa okuhlukile.

Imishini yokuncibilikisa nokuphonsa kanye nophethiloli we-7A04 alloy kuyafana nakwamanye ama-alloys e-aluminium. Kodwa-ke, ngenxa yobubanzi bayo obukhulu bokuncibilika kwezinga lokushisa kanye nomehluko omkhulu kubuningi bezakhi eziyinhloko ze-alloying, ukuhlukaniswa kujwayele ukwenzeka ngesikhathi sokuncibilika, futhi ingot ijwayele ukuqhekeka, ukuxega, kanye nesixazululo. Kulula ukuthola umoya, futhi okufakiwe okuxubile kuzokwakhiwa ngaphakathi kwengot. Ukuze unciphise lezi ziphambeko, ngaphezu kokulawula ngokuqinile ukwakheka kwe-alloy, ukunakwa kufanele kukhokhwe ekulawuleni inqubo yokuncibilikisa nokukhipha.

Izinga lokushisa elijikelezayo lokulingisa ingot lingu-720℃—745℃, izinga lokushisa le-ingot casting ngu-725℃—740℃; izinga lokushisa le-slab cast ngu-685℃—745℃; ama-ingots amasayizi amakhulu, ama-ingots angenalutho kanye nama-slabs kufanele abekwe ngaphambi kokuphonsa , Ingxenye yesango kufanele ifudumale ngemva kokusakazwa.

Ingxubevange ye-7A04 isetshenziswa kakhulu ukwenza izingxenye zesakhiwo ezigcizelelwe indiza: imishayo, izintambo, amakhanda, izikhumba, izimbambo, amalunga, ukuhlala. igiya izingxenye, njll. Imikhiqizo eseqedile ukuqeda engahlinzekwa yilezi: amapuleti, amapheshana, amaphrofayili, amapheshana, amabha, amapayipi, amaphaneli odonga, mahhala UKWAKHA futhi bafe UKWAKHAs, njll.

I-alloy inokuzwela okuphezulu kwe-notch namandla okukhathala okuphansi kwe-axial tensile. Uhlelo lokusebenza kufanele lukhethe ngokuqinile ukwakheka kwesakhiwo sokuklama, khetha umumo onokugxiliswa kwengcindezi ephansi kakhulu, futhi ukuguqulwa kwengxenye yengxenye nazo zonke izingxenye zoshintsho kufanele kube bushelelezi ukuze kugwenywe. kube ≥2mm. Gwema imihuzuko, imihuzuko namadentity amabi lapho ucubungula izingxenye.

Emikhiqizweni emikhulu eqedwe kancane, ikakhulukazi ama-forging amakhulu ayinkimbinkimbi namaphrofayili, ukusebenza okuphambene kufanele kubhekwe ngokuqinile, futhi nokuhlola okudingekayo okungonakali okufanele kwenziwe ukuze kuqinisekiswe ukuthi amaphutha angaphakathi kwebanga elivumelekile. Ukumelana nokugqwala kwe-7A04 alloy esifundazweni se-T4 akufanelekile, ngakho-ke ukuguga okwenziwa kuyadingeka. Ukumelana nokugqwala kweshidi lengxubevange le-7A04 elakhiwe nge-aluminium endala lilingana nalelo leshidi lengxube ye-aluminium engu-2A12 eligqoke i-aluminium. Ukumelana nokugqwala kwemikhiqizo ekhishwe kanye nezingxenye ezincane ze-cross-section kulingana naleyo ye-unclad aluminium duralumin. Ukwelashwa kokuguga okulinganiselwe kwe-7A04 alloy kunokwethenjelwa ukumelana nokuqhekeka kwe-stress corrosion cracking. Ukwelashwa kwe-anodizing kanye nokudweba kwendawo kungavikela ngempumelelo izinto ezikhishwe. Igqwalile.

Ishidi lengxubevange elingu-7A04-T6 linemodulus enwebekayo ephozithivu engu-66GN/mm2 ku-20°C, into ekhishiwe engu-71GN/mm2, kanye nokuqina kokuphuka kwendiza engu-Kc okungu-50.64MN/(m3/2). Isakhiwo se-semi-continuous casting 7A04 alloy ingot sihlanganisa i-α-Al solution eqinile, isigaba se-T (AlCuMgZn) kanye nesigaba se-S (Al2CuMg), kanye nenani elincane lezigaba ze-Mg2Si, AlFeMnSi kanye ne-Al6 (FeMn). Isakhiwo ngemva kokwelashwa kwesixazululo ngu-α S Ngemva kokuguga ku-100 ℃-140 ℃, isakhiwo siba yisigaba se-α S MgZn2 T.

7A04 ingxubevange ingakhubazeka ngenxa yokubanda noma ukushisa. Izinga lokuguquguquka elishisayo le-ingot lingaphansi noma lilingana no-60%, futhi izinga eliphezulu lokuguqulwa kwezinto ezikhubazekile lingafinyelela ku-80%. Ama-forging anezimo eziyinkimbinkimbi angenziwa, futhi izinga lokushisa lokubumba lingu-380°C-430°C. Lapho wenza ukulungisa okushisayo ezingxenyeni noma emikhiqizweni eqediwe kancane, izinga lokushisa lesikhunta lingu-130℃±15℃, futhi izinga lokushisa lengxenye ngokwayo lingu-130℃±10℃ noma 150℃±10℃. Isikhathi sokubamba ku-130℃±10℃ ngu-10h—12h. Isikhathi sokubamba sokushisisa ku-150℃±10℃ ngu-7h.

Isimo sokuhlinzekwa kwephaneli yodonga olukhishiwe yi-T6, ingalungiswa kulesi simo, futhi kufanele ishiselwe esimweni esisha sokucisha. Ukucaciswa kokuguga kwesigaba esisodwa ngu-140 ℃/16h; ukuguga okunezigaba ezimbili ku-120℃/3h 160℃/3h kungathola ukusebenza okuhle okuphelele. I-7A04 alloy inokusebenza okuhle kwe-welding yendawo kanye nokusebenza kahle.

Xhumanisa nale ndatshana: 7A04 Ingxubevange - Amandla Okukhiqiza Asondele Kumandla Aqinile

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