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PostPosted: Mon 17:20, 03 Jan 2011    Post subject: ugg italia 灰铸铁局&

灰铸铁局部激冷效果的研究与应用
攮hIt6黑铅租檄0一f7于蛆檄粗密I=一)、r盒属.1985,55(3):803李庆春主编.铸件形成理论.北京;机械工业出版社.19824陆文华主编.铸铁及其熔炼.北京:机械工业出版社,lg81收稿日期:l995年l0月l9日锌基合金塑性成形的研究洛阳工学院(471039)徐必鸿陈全德王洪敏中国船舶工业总公司75编王文芳√张永强髓胁·7;占,.~H【摘要】锌基合盘(ZA28,zA27)可挤压和轧制成形,但挤压成形塑性惋低.通过固祷后自然时敕处理.可有教地提高台金的综合力学性能,[link widoczny dla zalogowanych];挤压后直接人工时效,可有效地提高台盘的塑性咦鲫坚堂墼姚父西ResearchoilthePlasticityFormofziilc—BasedAlloysxuBihongChertQ~andeWangHongminWangWenfangZhangY~ngqiang[Abstract]Zinc--basedMloys(ZA22.ZA27)maybeformedbyrollingandextrusionbutwithlrpIa1tva“erextrudingTheresultsindicatethatnaturalangaftersolm[onheat—t~atmentleadstoeeffecfi…icreast…rofthecor~prebens]ve胁ecbnjclproperties.Moreover,[link widoczny dla zalogowanych],hrextrudingba】bmp…~belrplas~icityffafificial~geing1processed[Keywor~s'lzi—basedalloysrailingextrusionheat__Ire…entl引言锌基合金塑性成形国外研究甚少,我国也届起步阶段对高铝锌台金板材,我们采取轧制成形对其型材.则采取挤压成形,[link widoczny dla zalogowanych]。研究中发现,轧制成形的力学性能优良.而挤压成形的塑性偏低。为了提高其型材挤压态的力学性能.尤其是塑性.以拓宽其应用,对挤压型材的热处理也作了初步研究2试验方法及条件2.1台金成分试验台金采用ZA22、ZA27两个牌号.对其中个别合金元素进行调整,形成四个成分(见表1)。主要杂质含量给以控制,≤0.05,Sj≤0.04,Pb、Sn、Cd≤005。表1试验合叠成分(wt)合金A】CuMgZnnA122CulMgO.。】I2l~23O75~lool~0.02除量ZnAI22Cu1Mg0.0681~船05~l_850.【)5~0.07量ZnAI27CuIMg00:25~2810~1.50.01~0.02l袅童ZnAI27CugMg0025~2Bl75~225001~002I泉量22合金锭坯制备一26一用石墨坩埚电阻炉熔化,铜以A1一cu中间合金形式加入,AI、Zn、Mg分别采用Aoo、l锌、Mg—l板坯15×loo×200(ram),[link widoczny dla zalogowanych],在金属型中直接铸出;挤压锭坯l00×200ram,采用水冷金属型直接铸出。23塑性成形设备板材在蝴0o二辊式轧机上轧制,轧辊需预热到lo。~150℃;试验型材(q014mm棒材)在630t承压式挤压机上挤出2.4试样直接从板材上切取板状拉力试样;在@14mra型材上机加工出拉力试样。3试验结果及分析3.1塑性成形3.1l轧制成形(1)开轧温度:开轧温度为250℃时(低于共析转变温度属纯娉态组织轧制).台金变形抗力较太,轧制时裂边严重。开轧温度为280C时(已进入共析转变温度),可获得不同变形程度板材,且无裂边现象开轧温·男,[link widoczny dla zalogowanych],56岁,材料系讲师。热加工工艺》2/1996
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