不同比压下流变挤压铸造ZL111铝合金的性能与组织
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摘要
采用流变间接挤压铸造技术,研究了ZL111铝合金制动泵缸体的成形工艺。通过金相组织观察、拉伸试验、断口分析以及TEM分析等手段,研究了压射比压对铝合金制动泵缸体组织和性能的影响。结果表明,压射比压的增加,消除了铸件因补缩不足而产生的缩松;当压射比压由80MPa增加至95MPa,铸件的显微组织得到了细化,晶粒的平均尺寸由149μm减少至99μm,铸件的抗拉强度和伸长率分别达到了371 MPa和3.17%。
ZL111 aluminum alloy brake pump cylinder was produced by rheological indirect squeeze casting.Influence of injection specific pressure on the quality of brake pump cylinder was analyzed by X-ray detection,metallographic analysis and tensile test,TEM.The results reveal that with the increase of the injection specific pressure,the shrinkage porosities in casting are eliminated.With the injection specific pressure increased from 80 MPa to 95 MPa,the average grain size is decreased from 149μm to 99μm,and tensile strength and elongation of castings reach 371 MPa and 3.17%,respectively.
ZL111 aluminum alloy brake pump cylinder was produced by rheological indirect squeeze casting.Influence of injection specific pressure on the quality of brake pump cylinder was analyzed by X-ray detection,metallographic analysis and tensile test,TEM.The results reveal that with the increase of the injection specific pressure,the shrinkage porosities in casting are eliminated.With the injection specific pressure increased from 80 MPa to 95 MPa,the average grain size is decreased from 149μm to 99μm,and tensile strength and elongation of castings reach 371 MPa and 3.17%,respectively.
引文
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[2]WANG C M,NICKODEMUS G H,CREEDEN T P.Determining optimal semi-solid forming process parameters by simulation technique[A].//Proceeding of the 5th International Conference on the Processing of Semi-Solid Alloys and Composite[C].Colorado,USA,1998.
[3]GEBELIN J C,FAVIER D,SUERY M,et al.A FEM simulation of semi-solid material behavior[A].//Proc.4th Int.Conf.on SS Processing of Alloys and Composites[C].England,1996.
[4]TIMS M L,XU J,NICKODEMUS G,et al.Computer based numerical analysis of semi-solid metalworking[A].//Proceedings of the Fourth International Conference on the Semi-solid Processing of Alloys and Composites[C].University of Sheffield,England,19th.1996.
[5]MASASHI U.Feature of UBE Squeeze Process and UNRC Process(Semi Solid Casting)[A].//第三届中国国际压铸会议[C].上海,2002.
[6]ADACH M,SATO S.The effect of casting condition for Mechanical properties of cast alloys made with new rheocasting process[A].//7-th International Conference on Semi-solid Processing of Alloys and Composites[C].Japan,2002.
[7]WAHLEN A,FRAGNER W.Optimisation of the new rheocasting process using cellular automata[A].//7th International conference on Semi-solid Processing of Alloys and Compositres[C].Japan,2002.
[8]TAKAO K,RYOICHI S.Development of new semi-solid metal casting process for automotive suspension parts[A].//7th International Conference on Semi-solid Processing of Alloys and Composites[C].Japan,2002.
[9]XIA K,TAUSIG G.Liquidus casting of a wrought aluminum alloy2618for thixoforming[J].Materials Science and Engineering,1998,A246(1):1-10.
[10]MAO W,GUI C,ZHAO A,et al.Effect of pouring process on the microstructures of semi-solid AlSi7Mg alloy[J].Journal of Materials Science and Technology,2001,17(6):515-519.
[11]WANG H,DAVIDSON C J,TAYLOR J A.Semisolid casting of AlSiMg0.35alloy produced by low-temperature pouring[J].Materials Science Forum,2002,396-402:549-555.
[12]RYOICHI S,TOMOMI S,HIDEYA Y.Refinement of grain size of AC4CH aluminum alloy by temperature pouring[J].铸造工学,1997(7):549-555.
[13]HAGA T,KAPRANOS P.Simple rheocasting process[J].Mater.Proc.Tech.,2012,130-131:594-598.
[14]赵建新,朱鸣芳,金宰民,等.Al-Si合金在凝固过程中颗粒和枝晶组织的演变[J].理化检验(物理分册),2004(9):433-438.
[15]董杰,路贵民,任栖锋,等.液相线铸造法非枝晶半固态组织形成机理探讨[J].金属学报,2002(2):203-207.
[16]罗守靖,陈炳光,齐丕骧.液态模锻与挤压铸造技术[M].北京:化学工业出版社,2007.
[17]李伟东,陈和兴,王顺成,等.工艺参数对半固态挤压铸造A356合金组织与性能的影响[J].特种铸造及有色合金,2012,32(7):611-614.
[18]孙艳茹.ZL205A铝合金汽车空调器摇盘液态模锻工艺研究[D].哈尔滨:哈尔滨工业大学,2011.