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Solidification analysis method for large castings
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A technology of large-scale castings and analysis methods, which is used in the preparation of test samples, material defect testing, etc. Analysis and other issues to achieve the effect of ensuring product quality
Inactive Publication Date: 2011-06-15
KUNMING UNIV OF SCI & TECH
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Problems solved by technology
However, it is difficult to accurately analyze the slow solidification process of large castings
The Chinese patent application with the application number 200910199568.X discloses a method for studying the initial solidification behavior under external strong cooling conditions and accurately simulating the horizontal growth process of the solidification structure and its realization de
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Embodiment 1
[0017] In this embodiment, it is necessary to analyze the solidification process and solidification structure of a large ductile iron casting with a maximum hot joint diameter of 300mm and a weight of 30 tons for process optimization, wherein the alloy composition (weight percentage) of the large ductile iron casting is 3.62C, 2.01Si , 0.30Mn, 0.04P, 0.04S, 0.06Mg. Go through the following steps:
[0018] 1) According to the alloy composition and Fe-C phase diagram of the above-mentioned large castings, the solidification temperature is determined to be 1140°C according to the routine, and the solidification time is determined to be 4 hours according to the maximum hot joint size of the castings is 300mm;
[0019] 2) Inject the alloy solution with the same alloy composition as the large casting into an aluminum oxide crucible with a wall thickness of 5mm, an inner diameter of 80mm, and a height of 200mm, and place the crucible at a maximum working temperature of 1500°C with a ...
Embodiment 2
[0023] In this embodiment, it is necessary to analyze the solidification process and solidification structure of a large gray iron casting with a maximum hot joint diameter of 200mm and a weight of 15 tons, in order to optimize the process, wherein the alloy composition (weight percentage) of the large ductile iron casting is 3.22C, 1.41Si , 0.70Mn, 0.08P, 0.07S. Go through the following steps:
[0024] 1) According to the alloy composition and Fe-C phase diagram of the above-mentioned large-scale casting, determine its solidification temperature to be 1150°C, and determine its solidification time to be 2.5 hours according to the maximum hot joint size of the casting is 200mm;
[0025] 2) Inject the alloy solution with the same alloy composition as the large casting into an aluminum oxide crucible with a wall thickness of 5mm, an inner diameter of 80mm, and a height of 200mm, and place the crucible at a maximum working temperature of 1500°C with a furnace diameter of 100mm, h...
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Abstract
The invention provides a solidification analysis method for large castings, which is characterized by comprising the following steps of: (1) determining the solidification temperature and the solidification time of a large casting according to alloy components, a phase diagram and the biggest size of hot center; (2) injecting liquid alloy comprising the chemical components the same as the large casting into a container, delivering the container into an electric heating furnace, solidifying the liquid alloy in the container according to the determined solidification temperature and solidification time of the step (1), cooling the alloy to the room temperature, and obtaining a small-size test piece; and (3) according to the convention, analyzing the small-size test piece, and obtaining the solidification process and tissues of the small-size test piece, wherein the solidification process and the tissue directly reflect the solidification process and tissue of the large casting. By the solidification analysis method, whether the tissue of the large casting has deficiency can be judged in the solidification process so as to adjust the solidification temperature and the solidification time of the large casting in time, thus the quality of products is guaranteed, and the deficiencies that the cost is high, the test period is long, and the like when the large casting is used for experiments are effectively solved.
Description
technical field [0001] The present invention relates to a method for solidification analysis of large castings, in particular to a method for analyzing the internal structure of the small-sized test piece after solidifying the small-sized test piece according to the solidification conditions of the large-scale casting, so as to obtain the solidification process and structure of the large-scale casting. The invention belongs to the field of physical and chemical inspection and metal casting technology. Background technique [0002] Large castings with a weight of several tons or tens of tons, or even hundreds of tons, are prone to structural defects due to their long solidification time. And once there are organizational defects, it will lead to scrapping and economic losses, and it will cause safety accidents during use, and the consequences are immeasurable. For this reason, before the production of large-scale castings, it is necessary to analyze the solidification proces...
Claims
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