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Method for predicting freckle morphology defects in directional solidification peritectic alloy paste area

A directional solidification, mushy zone technology, applied in chemical property prediction, instrumentation, computational theoretical chemistry, etc., can solve problems such as low accuracy and insufficient dendritic mushy zone analysis

Active Publication Date: 2021-01-05
LANZHOU UNIVERSITY
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Problems solved by technology

However, the current analysis of the evolution of the dendritic mushy zone associated with fluid flow during peritectic solidification is far from adequate
[0005] As mentioned above, although it is very important to predict the formation of freckle morphology, which is related to the final performance of alloy materials prepared by solidification, there are relatively few data that can be used to predict the formation of freckle morphology, especially for peritectic alloys, and the prediction accuracy is relatively low. Low

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  • Method for predicting freckle morphology defects in directional solidification peritectic alloy paste area
  • Method for predicting freckle morphology defects in directional solidification peritectic alloy paste area
  • Method for predicting freckle morphology defects in directional solidification peritectic alloy paste area

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0031] The present invention needs to carry out directional solidification experiment first to prepare sample rod, comprises the following steps:

[0032] A Sn-36at.%Ni alloy was first cast in an induction melting furnace using nickel and tin with a purity of 99.9%. Rods with a diameter of 3 mm and a length of 110 mm were then cut from the ingot. The rod is subsequently placed in the Al 2 o 3tube and placed in a Bridgman type furnace. Next, the temperature of the rod was raised to 1250°C to melt it, after which the sample was left to stand in a Bridgman type furnace for 30 minutes. Subsequent directional growth was performed under a constant temperature gradient at different growth rates: 5 μm / s, 10 μm / s, 20 μm / s and 40 μm / s. The tube was then rapidly quenched when the growth distance re...

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Abstract

The invention provides a method for predicting freckle morphology defects in a directional solidification peritectic alloy paste area. The method comprises the steps: firstly, obtaining the relation between the Reynolds number and the permeability K; and establishing a model in which a fine secondary dendrite is located between two thick secondary dendrites, and obtaining the relationship betweenthe permeability K and the solid-phase volume fraction fS in the paste area by combining the influence of the TGZM effect and the G-T effect on the secondary dendrites. According to the relations, therelation between the Reynolds number and the solid phase volume fraction fS is obtained, and defect formation is predicted through the maximum value when the Reynolds number changes along with the solid phase volume fraction fS. In the peritectic solidification process, the formation of the freckle morphology in the dendritic paste area can be more accurately predicted.

Description

technical field [0001] The invention relates to alloy preparation, in particular to a method for predicting freckle morphology defects in the mushy region of directionally solidified peritectic alloys. Background technique [0002] During the solidification process of alloys with a certain solidification interval, a mushy zone where solid and liquid coexist will be formed. It has been proven that defects such as freckle topography are often formed due to heat convection in the mushy zone. The freckle morphology consists of fine chains of dendrite fragments and pores along the solidification direction, and its presence seriously affects the properties of the solidified material. During upward directional solidification, assuming a stable temperature distribution, thermal convection is suppressed, whereas when the repelled solute makes the melt lighter, the solute distribution becomes unstable, leading to thermal convection. [0003] To quantify longitudinal heat convection ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C10/00G16C20/30
CPCG16C10/00G16C20/30
Inventor 彭鹏张安桥岳锦绵徐远丽张旭东马智琨
Owner LANZHOU UNIVERSITY
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