公开(公告)号：US08942462B2

公开(公告)日：2015-01-27

申请号：US13757914

申请日：2013-02-04

Applicant: GM Global Technology Operations LLC

Inventor： Qigui Wang ,  James W. Knight

IPC: G06K9/00 ,  G06T7/00 ,  G06T7/40

CPC classification number: G06T7/0004 ,  G06K9/00 ,  G06T7/41 ,  G06T2207/10056 ,  G06T2207/30116

Abstract: A method to automatically quantify dendrite arm spacing in dendritic microstructures. Once a location of interest in a cast material specimen has been identified, the information contained in it is automatically analyzed to quantify dendrite cell size information that is subsequently converted into a quantified dendrite arm spacing through an empirical relationship or a theoretical relationship. In one form, the relationship between DCS and DAS is such that the DAS in dendritic structure of cast aluminum alloys may be automatically determined from the measurement of one or more of dendrite cell size and the actual volume fraction of the eutectic phases in the local casting microstructure. Non-equilibrium conditions may be accounted for in situations where a theoretical volume fraction of a eutectic phase of the alloy in equilibrium condition is appropriately modified. Thus, in situations where equilibrium conditions—such as those where the casting is cooled very slowly during solidification—does not apply (such as during rapid cooling and consequent solidification), the eutectic measured in the non-equilibrium condition, which can be smaller than the theoretical value in equilibrium, can be accounted for.

Abstract translation: 树枝状微结构中树突臂间距自动量化的方法。 一旦已经识别出铸造材料样品中感兴趣的位置，则自动分析其中包含的信息以量化树突状细胞尺寸信息，随后通过经验关系或理论关系将信号转化为量化枝晶臂间距。 在一种形式中，DCS和DAS之间的关系使得铸铝合金树枝状结构中的DAS可以通过测量本地铸造中的共晶相的枝晶晶粒尺寸和实际体积分数中的一种或多种来自动确定 微观结构。 在平衡条件下合金的共晶相的理论体积分数适当改变的情况下，可以考虑非平衡条件。 因此，在平衡条件（例如铸造在凝固期间非常缓慢地冷却的条件）的情况下不适用（例如在快速冷却和随后的凝固期间），在非平衡条件下测量的共晶体可以小于 平衡的理论价值，可以解释。

公开(公告)号：US20140119612A1

公开(公告)日：2014-05-01

申请号：US14070609

申请日：2013-11-04

Applicant: GM Global Technology Operations LLC

Inventor： Qigui Wang ,  James W. Knight ,  Devin R. Hess

IPC: G01N21/84

CPC classification number: G01N21/84 ,  G06T7/41 ,  G06T2207/10056 ,  G06T2207/30116

Abstract: A method to automatically quantify dendrite arm spacing in dendritic microstructures. Once a location of interest in a cast material specimen has been identified, the information contained in it is automatically analyzed to quantify dendrite cell size information that is subsequently converted into a quantified dendrite arm spacing through an empirical relationship or a theoretical relationship. In one form, the relationship between DCS and DAS is such that the DAS in dendritic structure of cast aluminum alloys may be automatically determined from the measurement of one or more of dendrite cell size and the actual volume fraction of the eutectic phases in the local casting microstructure. Non-equilibrium conditions may be accounted for in situations where a theoretical volume fraction of a eutectic phase of the alloy in equilibrium condition is appropriately modified. Thus, in situations where equilibrium conditions—such as those where the casting is cooled very slowly during solidification—does not apply (such as during rapid cooling and consequent solidification), the eutectic measured in the non-equilibrium condition, which can be smaller than the theoretical value in equilibrium, can be accounted for.

Abstract translation: 树枝状微结构中树突臂间距自动量化的方法。 一旦已经识别出铸造材料样品中感兴趣的位置，则自动分析其中包含的信息以量化树突状细胞尺寸信息，随后通过经验关系或理论关系将信号转化为量化枝晶臂间距。 在一种形式中，DCS和DAS之间的关系使得铸铝合金树枝状结构中的DAS可以通过测量本地铸造中的共晶相的枝晶晶粒尺寸和实际体积分数中的一种或多种来自动确定 微观结构。 在平衡条件下合金的共晶相的理论体积分数适当改变的情况下，可以考虑非平衡条件。 因此，在平衡条件（例如铸造在凝固期间非常缓慢地冷却的条件）的情况下不适用（例如在快速冷却和随后的凝固期间），在非平衡条件下测量的共晶体可以小于 平衡的理论价值，可以解释。

公开(公告)号：US20130272599A1

公开(公告)日：2013-10-17

申请号：US13757914

申请日：2013-02-04

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Qigui Wang ,  James W. Knight

IPC: G06T7/00

CPC classification number: G06T7/0004 ,  G06K9/00 ,  G06T7/41 ,  G06T2207/10056 ,  G06T2207/30116

Abstract: A method to automatically quantify dendrite arm spacing in dendritic microstructures. Once a location of interest in a cast material specimen has been identified, the information contained in it is automatically analyzed to quantify dendrite cell size information that is subsequently converted into a quantified dendrite arm spacing through an empirical relationship or a theoretical relationship. In one form, the relationship between DCS and DAS is such that the DAS in dendritic structure of cast aluminum alloys may be automatically determined from the measurement of one or more of dendrite cell size and the actual volume fraction of the eutectic phases in the local casting microstructure. Non-equilibrium conditions may be accounted for in situations where a theoretical volume fraction of a eutectic phase of the alloy in equilibrium condition is appropriately modified. Thus, in situations where equilibrium conditions—such as those where the casting is cooled very slowly during solidification—does not apply (such as during rapid cooling and consequent solidification), the eutectic measured in the non-equilibrium condition, which can be smaller than the theoretical value in equilibrium, can be accounted for.

Abstract translation: 树枝状微结构中树突臂间距自动量化的方法。 一旦已经识别出铸造材料样品中感兴趣的位置，则自动分析其中包含的信息以量化树突状细胞尺寸信息，随后通过经验关系或理论关系将信号转化为量化枝晶臂间距。 在一种形式中，DCS和DAS之间的关系使得铸铝合金树枝状结构中的DAS可以通过测量本地铸造中的共晶相的枝晶晶粒尺寸和实际体积分数中的一种或多种来自动确定 微观结构。 在平衡条件下合金的共晶相的理论体积分数适当改变的情况下，可以考虑非平衡条件。 因此，在平衡条件（例如铸造在凝固期间非常缓慢地冷却的条件）的情况下不适用（例如在快速冷却和随后的凝固期间），在非平衡条件下测量的共晶体可以小于 平衡的理论价值，可以解释。