On the relationship between structure dispersity and heat resistance of materials

The effect was investigated of the dispersity of structure and of the chemical composition of KhN45Yu alloy and of 12Kh18N10T and Kh25T steels upon their heat resistance at the temperature of 800 deg C in the air for up to 1000 h. The metallographic and the X-ray analyses were used in the investigations. It was shown that such alloying elements as aluminium and cerium raise the resistance to scaling of chromium-nickel alloys, whereas materials with a fine-grained structure oxidize to a lesser degree than the coarse-grained ones