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A New Alloy Hot Cracking Tendency Prediction Method

A prediction method and alloy technology, applied in measuring devices, material thermal analysis, instruments, etc., can solve problems such as invariance

Active Publication Date: 2019-12-27
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

The currently widely used Clyne-Davies model predicts the tendency of hot cracking, mainly based on the theoretically calculated T 0.99 (t 0.99 ), T 0.9 (t 0.9 ), T 0.4 (t 0.4 ) to calculate the hot cracking sensitivity of the alloy, assuming that the solidified solid phase ratio of 40%, 90% and 99% is any composition, and the dendrite lap temperature, crack initiation temperature and solidification end temperature of the alloy at any cooling rate have a "subjective Disadvantages of "invariance" and "immutability"

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  • A New Alloy Hot Cracking Tendency Prediction Method
  • A New Alloy Hot Cracking Tendency Prediction Method
  • A New Alloy Hot Cracking Tendency Prediction Method

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Embodiment

[0045] The hot cracking tendency of Mg-6.5Zn-1Y-0.5Zr and Mg-6.5Zn-2Y-0.5Zr magnesium alloys was predicted by this method.

[0046] 1. In the Mg-6.5Zn-1Y-0.5Zr alloy, T coh =608.8°C, T hci =411.2°C, T s =365.7°C. That is, CSC(T)=(T hci -T s ) / (T coh -T hci )=0.23.

[0047] 2. In Mg-6.5Zn-2Y-0.5Zr alloy T coh =617.5°C, T hci =397.4°C, T s =330.9°C. That is, CSC(T)=(T hci -T s ) / (T coh -T hci ) = 0.30.

[0048] According to this method, it can be predicted that the hot cracking tendency of Mg-6.5Zn-2Y-0.5Zr alloy is greater than that of Mg-6.5Zn-2Y-0.5Zr alloy.

[0049] The molten paraffin infiltration method was used to measure the macroscopic hot crack volumes of the two alloys and to verify the accuracy of the method's predictions. The macroscopic crack volumes of the two alloys are as Figure 5 shown. Among them, the macroscopic crack volume of Mg-6.5Zn-1Y-0.5Zr alloy is 0.1076cm 3 , the macroscopic crack volume of Mg-6.5Zn-2Y-0.5Zr alloy is 0.1208cm 3 ....

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Abstract

The present invention is a new hot cracking tendency prediction method, specifically a hot cracking tendency prediction method based on the Clyne-Davies model, and its technical idea is: use dendrite interference point temperature T coh instead of T 0.4 , crack initiation temperature T hci instead of T 0.9 . Solidification temperature T s instead of T 0.99 . By taking the measured T coh and T hci Bring it into the hot crack prediction model to calculate the CSC T value, the hot cracking risk design area of ​​the high performance alloy system is proposed, so as to optimize the high performance alloy body with low hot cracking tendency.

Description

technical field [0001] The invention relates to a new hot cracking tendency prediction method, which is applied to testing and evaluating alloy hot cracking susceptibility. Background technique [0002] At present, many alloy systems with high mechanical properties show a high tendency to hot cracking during casting, which limits their wider application. In the casting production process, for thin-walled alloy castings with complex structures and large semi-continuous casting ingots, hot cracking has become a bottleneck for improving product quality, reducing production costs and mass production. The currently widely used Clyne-Davies model predicts the tendency of hot cracking, mainly based on the theoretically calculated T 0.99 (t 0.99 ), T 0.9 (t 0.9 ), T 0.4 (t 0.4 ) to calculate the hot cracking sensitivity of the alloy, assuming that the solidified solid phase ratio of 40%, 90% and 99% is any composition, and the dendrite lap temperature, crack initiation tempera...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/00
Inventor 刘正魏子淇张峰周野
Owner SHENYANG POLYTECHNIC UNIV
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