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Affect of pressurized solidification on the secondary dendritic arm spacing in lead-tin alloy.

机译：加压凝固对铅锡合金二次枝晶臂间距的影响。

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摘要

Casting is an ancient manufacturing process. Solidification is a process in which liquid metal is let to freeze under various processing conditions to attain the properties, physical shape etc desired. When any liquid freezes into a solid there is a wave of a solid-liquid interface moving forward converting the liquid or molten metal into a solid. The microstructures formed tend to define the behavior and properties of the material in production and usage. Dendrites are the complex morphologies created when the solid-liquid interface advances into the melt during solidification. The morphologies and the side-arm spacing of these dendrites influence the mechanical properties of the cast products. Throughout time there has been lot of research to design new solidification routes and process flow to create materials with excellent properties to meet the ever increasing customer demands. One such effort is the inclusion of pressure as a variable during alloy solidification. It is the motive of this project to study the affect of pressure during solidification of Lead-Tin alloy on the secondary dendritic arm spacing, so as to achieve a complete understanding and control of the science of dendritic solidification. Loads ranging between -40 and -230 pounds were applied at a frequency of 0.5 Hz over a mold and piston system designed for the process of pressure application and simultaneous temperature gradients. The results obtained were compared with no pressure sample. It was observed that there is an increase in the secondary dendritic arm spacing due to the application of the pressure. After conducting the DAS measurements it was understood that coarsening took place in the case of pressure solidification, and could be the reason for increase in the secondary dendritic arm spacing, increase in the thickness of the secondary arms.
机译：铸造是古老的制造过程。固化是一种过程，其中使液态金属在各种加工条件下冷冻以获得所需的性能，物理形状等。当任何液体冻结成固体时，就会发生一波固液界面，将液体或熔融金属转变为固体。所形成的微结构倾向于定义材料在生产和使用中的行为和特性。枝晶是固液界面在凝固过程中进入熔体时产生的复杂形貌。这些树枝状晶体的形态和侧臂间距会影响铸件的机械性能。长期以来，人们进行了大量研究来设计新的固化路线和工艺流程，以创建具有优异性能的材料，以满足不断增长的客户需求。一种这样的努力是在合金凝固过程中将压力作为变量包括在内。研究铅锡合金凝固过程中压力对二次枝晶臂间距的影响是本项目的目的，以便对枝晶凝固科学有一个完整的了解和控制。在模具和活塞系统上以0.5 Hz的频率施加-40到-230磅之间的载荷，该系统设计用于压力施加和同时的温度梯度过程。将获得的结果与无压力样品进行比较。观察到，由于施加压力，第二树突臂间距增加。在进行DAS测量之后，可以理解，在压力固化的情况下会发生粗化，这可能是第二个枝晶臂间距增加，第二个枝臂厚度增加的原因。

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  • 作者

    Nibhanupudi, Syam S.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Engineering Metallurgy.
  • 学位 M.S.
  • 年度 2008
  • 页码 48 p.
  • 总页数 48
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;
  • 关键词

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