7A04 Alloy - Goho Simba Pedyo Nekusimba Simba
7A04 alloy is an Al-Zn-Mg-Cu series heat-treatable aerospace super-hard aluminium alloy, inogona kupiswa nekusimbiswa. Kuumbwa kwayo kwakanyorwa muGB/T3190-2008, uye inoenderana neB95 alloy yeSoviet Union neRussia neAlZnMgCu1 yekuGermany. .5.3.4365 alloy yakaenzana, nekuti muna 1944 fekitori yechi95 yeSoviet Union yakabudirira kuyedza-yakagadzira iyi alloy semi-finished chigadzirwa, nekudaro zita rekuti B95 alloy. Muna 1957, China Northeast Light Alloy Co., Ltd. (iyo Harbin Aluminium Processing Plant) yakagadzira iyi alloy nerubatsiro rweSoviet nyanzvi. Alloy mahwendefa uye extruded zvinhu.
Chinhu chikuru che 7A04 alloy ndechekuti goho rayo simba Rpo.2 iri pedyo nechisimba cheRm, plastiki yayo yakaderera, uye inonzwa kushushikana kwepfungwa, kunyanya kana ichiiswa pasi pekudengenyeka uye inodzokororwa static mitoro. Kune dhizaini, kugadzira uye kuungana kwezvikamu, kusungirirwa kwekushushikana uye kuwedzera kushushikana zvinhu zvinofanirwa kudzivirirwa zvakanyanya sezvinobvira. 7A04 alloy haidziviriri kupisa uye inopfava zvakanyanya kana tembiricha yekushanda yakakwira kupfuura 125 ℃. Stress corrosion cracking resistance yegobvu 7A04 alloy workpieces mupfupi transverse direction (ST) yakadzikira.
Kemikari ye7A04 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, mamwe matsvina ari ega 0.05, anokwana 0.10, uye mamwe ndiAl. Tsanangudzo yekusakwana annealing ye7A04 alloy semi-yakapera uye yepakati chigadzirwa mahwendefa, mitsetse, profiles, mabara nemapombi (290—320) ℃/(2—4) h, kutonhora kwemhepo; tsanangudzo yekuzadza zvakakwana (390-430) ℃/ (0.5-1.5) h, kutonhora kwechoto kusvika ≤ 200 ℃ pamwero wekudzikisa tembiricha we ≤ 30 ℃/h, kutonhora kwemhepo kubva muchoto, kana kunyura pa (320-380). ) ℃ ye(1-2) h. Kuitira kuvandudza kushanda kwechoto chemetallurgical, fekitari inowanzopisa pa400°C-420°C kwemaawa maviri, yoitonhodza kusvika ku<2°C pamwero wekutonhodza we150°C/h, yozotonhodza mhepo. choto.
Iyo tembiricha yekugadzirisa tembiricha yeiyi alloy ndeye 465 ℃-475 ℃, yakadzimwa mumvura patembiricha yekamuri, uye nguva yekufambisa ipfupi pane 25s. Aluminium yekugadzirisa zvidyarwa zvinowanzo tora yakanyanya kunangwa mhinduro kurapwa uye kuchembera marapirwo anoenderana neakasiyana zvigadzirwa uye zvigadzirwa zvezvakasiyana zvakatemwa.
Iyo yekunyungudutsa uye yekukanda midziyo uye mafuta e7A04 alloy akafanana neaya emamwe aruminiyamu alloys. Nekudaro, nekuda kwehukuru hwayo hwekunyungudika tembiricha uye misiyano mikuru muhuremu hwezvinhu zvikuru zvealloying, kupatsanurwa kunowanzoitika panguva yekunyungudutswa, uye ingot inowanzoitika kutsemuka, kusununguka, uye kugadzirisa. Zviri nyore kuwana mhepo, uye yakawanda oxidized inclusions ichaumbwa mukati meingot. Kuti uderedze zvikanganiso izvi, kunze kwekunyatso kudzora kuumbwa kweiyo alloy, kutarisisa kunofanirwa kubhadharwa kune kutonga kwekunyungudika nekukanda maitiro.
Round ingot casting tembiricha i720℃—745℃, tembiricha yekukanda ingot yemhepo i725℃—740℃; tembiricha yekukanda slab ndeye 685 ℃—745 ℃; mahombe saizi ingots, hollow ingots uye slabs anofanirwa kuiswa asati akanda , Chikamu chegedhi chinofanira kudzikamiswa mushure mekukanda.
7A04 alloy inonyanya kushandiswa kugadzira ndege dzakasimbiswa zvimiro zvikamu: matanda, tambo, bulkheads, matehwe, mbabvu, majoini, kumhara. giya zvikamu, nezvimwe. Zvigadzirwa zvehafu-zvakapera zvinogona kupihwa ndezvi: mahwendefa, mitsetse, profiles, mitsetse, mabara, mapaipi, mapaneru emadziro, mahara. forging uye kufa forgings, nezvimwe.
Iyo alloy ine yakakwirira notch sensitivity uye yakaderera axial tensile kuneta simba. Chishandiso chinofanira kunyatso sarudza chimiro chechimiro chedhizaini, sarudza chimiro chine yakaderera kushushikana, uye shanduko yechikamu chikamu uye ese ekuchinja zvikamu zvinofanirwa kuve zvakatsetseka kuti zvidzivise. kuva ≥2mm. Dzivisa kukwenya, mabrasions uye mazino akakomba paunenge uchigadzira zvikamu.
Kune zvihombe zvakapedzwa zvigadzirwa, kunyanya zvihombe zvakaomesesa zvekuumbwa uye maprofile, iyo inochinjika mashandiro anofanirwa kunyatsoongororwa, uye kwakasiyana-siyana kusingakuvadzi kuyedzwa kunofanirwa kuitwa kuti ive nechokwadi chekuti hurema huri mukati meiyo inobvumidzwa. Iyo corrosion resistance ye7A04 alloy muT4 state haina kukodzera, saka kuchembera kwekugadzira kunodiwa. Kupokana kwekuora kwearuminiyamu-yakapfeka 7A04 alloy sheet yakashongedzwa yakaenzana neyealuminium-clad 2A12 alloy sheet. Kuramba kwecorrosion yezvigadzirwa zvakaburitswa uye zvikamu zvidiki zvemuchinjiko zvakaenzana neiyo unclad aluminium duralumin. Iyo graded kuchembera kurapwa kwe7A04 alloy ine yakavimbika kushushikana kushungurudza corrosion kupaza kuramba. Anodizing uye pendi yependi kurapwa inogona kunyatso chengetedza iyo extruded zvinhu. Corroded.
7A04-T6 alloy sheet ine yakanaka elastic modulus ye 66GN / mm2 pa 20 ° C, chinhu chakawedzerwa che 71GN / mm2, uye kuoma kwendege kutsemuka Kc kwe50.64MN / (m3 / 2). Chimiro che semi-inoramba ichikanda 7A04 alloy ingot inosanganisira α-Al solid solution, T (AlCuMgZn) chikamu uye S (Al2CuMg) chikamu, pamwe chete nechikamu chiduku cheMg2Si, AlFeMnSi uye Al6 (FeMn) zvikamu. Chimiro mushure mekugadzirisa kurapwa ndeye α S Mushure mekukwegura pa 100 ℃-140 ℃, chimiro chinova α S MgZn2 T chikamu.
7A04 alloy inogona kukanganiswa nekutonhora kana kupisa. Iyo inopisa inoshatisa deformation rate yeingot ishoma kana yakaenzana ne60%, uye iyo yakanyanya deformation rate yeyakaremara zvinhu inogona kusvika 80%. Mafogi ane maumbirwo akaomarara anogona kugadzirwa, uye tembiricha yekubikira i380°C-430°C. Paunenge uchiita gadziriso yekupisa pane zvikamu kana semi-yakapedzwa zvigadzirwa, tembiricha yekuumbwa i130 ℃ ± 15 ℃, uye tembiricha yechikamu pachayo i130 ℃ ± 10 ℃ kana 150 ℃ ± 10 ℃. Nguva yekubata pa130℃±10℃ i10h—12h. Nguva yekubata yekudziya pa150℃±10℃ ndeye 7h.
Iyo yekugovera mamiriro eiyo extruded wall panel ndeye T6, inogona kugadziriswa mune ino mamiriro, uye inofanirwa kupiswa mune itsva kudzimwa mamiriro. Iyo imwe-nhanho yekuchembera yakatarwa ndeye 140 ℃/16h; kuchembera kwematanho maviri pa120 ℃/3h 160 ℃/3h kunogona kuwana kuita kwakanaka kwakazara. 7A04 alloy ine yakanaka nzvimbo welding kuita uye machinability.
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