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    • 4. 发明授权
    • Method to determine skin-layer thickness in high pressure die castings
    • 确定高压压铸件中皮层厚度的方法
    • US09576352B2
    • 2017-02-21
    • US14253119
    • 2014-04-15
    • GM Global Technology Operations LLC
    • Qigui WangWenying YangJames W. Knight
    • G06T7/00G01N21/88
    • G06T7/0004G01N21/88G06T2207/30136
    • A quantitative metallographic method to measure skin layer thickness in high pressure die cast aluminum components. Because the faster-cooling skin layer region exhibits a higher volume fraction of eutectic phases than that of a slower-cooling inner region, measurements showing such higher eutectic phases can be used to quantify such layer thickness. An image at various thicknesses of a location of interest in a cast component sample is first obtained using an image analyzer, from which eutectic volume fractions within each of the received images may be determined. Comparisons of the determined volume fractions can be made against a known or predicted quantity for a particular alloy composition, and then correlated to the skin layer thickness via differences between the received or measured quantities and those of the known standard.
    • 用于测量高压压铸铝组件中的表层厚度的定量金相法。 因为更快冷却的表皮层区域表现出比较慢冷却的内部区域更高的共晶相体积分数,所以可以使用显示这种更高共晶相的测量来量化这种层厚度。 首先使用图像分析仪获得铸件成分样品中感兴趣位置的各种厚度的图像,从而可以确定每个接收图像内的共晶体积分数。 可以针对特定合金组合物的已知或预测量对所确定的体积分数进行比较,然后通过接收或测量的量与已知标准物质之间的差异与皮肤层厚度相关。