Properties of alloy KhN50MBVYu with carbon and boron
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An increase of the carbon content of alloy KhN50MBVYu from 0.02 to 0.2% results in an increase of the amount an size of carbide precipitates, reduces the grain size, and increases the formation temperature of the eutectic. The strenghth and ductility are almost unchanged at 20 and 750°C, while the fracture toughness and long-term strength decrease.
In the range of hot working temperatures the fracture toughness decreases sharply with the addition of 0.05% C or more, which is due to the large amount of carbides in the grain boundaries. An increase of the carbon content from 0.02 to 0.5% leads to some decrease of the ductility, and further addition of carbon raises the elongation.
The addition of 0.004–0.08% B to alloy KhN50MBVYu increases the amount and size of excess phases, refines the grains, and leads to the formation of low-melting boride eutectics. In amounts up to 0.08%, boron has little effect on the mechanical properties at 20 and 750°C, but reduces the plasticity (forgeability).
KeywordsGrain Size Mechanical Property Carbide Boron Ductility
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