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Observation on metallographic structure of cast impeller

a) Metallographic observation of casting state Etchant: aqua regia solution Magnification: 100X The as cast structure of zg1crl8ni9ti is shown in Figure 1. Structure description: there are ferrite distributed in dendrite on the austenitic matrix, forming austenite + ferrite + granular carbide. After 18-8 stainless steel is cooled slowly...

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Ultrasonic flaw detection of cast impeller spokes

Adjustment of scanning speed: when adjusting the baseline with 1:1, the method is the same as above. Turn the knob to 50mm gear. The ultrasonic flaw detection of spokes is also based on Φ 2mm is the sensitivity. Sensitivity adjustment method: also take the spoke bottom...

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Chemical composition inspection of impeller castings

The chemical composition inspection methods of impeller castings include chemical analysis and spectral analysis. Chemical analysis has high precision and can be used as an arbitration method, but the analysis speed is slow. Although the analytical accuracy of spectral analysis method is slightly lower than that of chemical analysis...

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Heat treatment process of impeller investment casting sand casting

In order to improve the mechanical properties of zg1cr18ni9ti stainless steel impeller investment casting sand casting, reduce segregation and improve corrosion resistance. Solid solution treatment (as cast) → stabilization heat treatment process was selected in the experimental process. 75kW air electric furnace is selected for heating. 1. Solution treatment...

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Sand falling of impeller investment casting sand casting

Because it is a composite mold of molten model shell and sodium silicate sand mold, the sand dropping process of impeller investment casting sand casting is divided into two stages, namely, the cleaning of sodium silicate sand in sand casting and the alkali boiling cleaning of molten model shell....

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