Research Method of Solidification Process Information on Free Surface of Metal Melt

A technology of metal melt and process information, applied in the direction of applying stable tension/pressure to test material strength, instruments, and using wave/particle radiation for material analysis, etc., can solve the problem of lack, surface solidification structure varies greatly, and laws are difficult to find, etc. question

Active Publication Date: 2020-11-17
BEIHANG UNIV
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Problems solved by technology

The solidification conditions of a thin layer of metal melt located on the free surface of liquid metal are different from the three-dimensional crystallization space inside the melt in the traditional solidification theory. The initial crystallization process is carried out in a two-dimensional plane, and will be affected by material composition, surface Due to the influence of many factors such as heat dissipation (melt radiation and gas convection heat dissipation), melt convection, surface tension, atmosphere, added materials (powder, wire, etc.) and surface inclusions, the surface solidification structure varies greatly and the law is difficult to find. Research on the solidification behavior of free surfaces of liquid metals has been lacking in feasible breakthroughs

Method used

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  • Research Method of Solidification Process Information on Free Surface of Metal Melt
  • Research Method of Solidification Process Information on Free Surface of Metal Melt
  • Research Method of Solidification Process Information on Free Surface of Metal Melt

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Embodiment 1

[0030] Embodiment 1 The research method of free surface solidification structure of titanium alloy melt

[0031] Such as figure 1 As shown, the method mainly includes the following steps, designing a tensile sample (a); point-shaped laser surface remelting (b); fast breaking of the sample (c); fracture thermal crack structure observation (d) four parts, specifically The research steps are as follows:

[0032] Design the tensile test specimen. According to the conventional built-in parameters of the high-power laser, universal mechanical testing machine and scanning electron microscope used in the research, the dimensions of the plate-shaped tensile specimen specially used for the observation of the surface solidification structure are designed as follows: figure 2 shown. The surface of the sample is polished, and the thickness h of the sample is determined according to the following formula: h=F / s·k·σ.

[0033] Among them, F is the tensile force of the universal testing m...

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Abstract

The invention relates to a research method for information in a metal melt free surface solidification process. The method realizes observation and research on a metal melt free surface solidificationstructure by carrying out the steps of size design, spot-shaped laser remelting, rapid tensile breaking and fracture observation on a plate-shaped tensile sample of a metal material, is a practical research way for liquid metal free surface solidification behavior, and can provide a new method and a new understanding for basic theoretical research on metal solidification.

Description

technical field [0001] The invention relates to a method for researching solidification process information on the free surface of a metal melt. Background technique [0002] The solidification of the free surface of the liquid is a ubiquitous natural phenomenon (such as freezing of the water surface). The surface solidification phenomenon of liquid metal can be found in solidification technologies such as casting, welding, directional solidification, and laser surface modification. Therefore, the free surface of the metal melt The solidification behavior of metals is an important basic scientific problem in the theory of metal solidification. The solidification conditions of a thin layer of metal melt located on the free surface of liquid metal are different from the three-dimensional crystallization space inside the melt in the traditional solidification theory. The initial crystallization process is carried out in a two-dimensional plane, and will be affected by material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N23/2251B22D27/04
CPCB22D27/04G01N3/08G01N23/2251G01N2203/0017G01N2203/0066G01N2203/0067G01N2203/0641
Inventor 何蓓田象军程序李卓李佳张述泉刘栋陈鑫陈瑞
Owner BEIHANG UNIV
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