Publisher： Trans Tech Publications
E-ISSN： 1662-9752|2015|816|594-600
ISSN： 0255-5476
Source： Materials Science Forum, Vol.2015, Iss.816, 2015-05, pp. : 594-600
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Abstract
The effect of Mo addition on the grain growth of Inconel 718 alloy has been investigated. It was revealed that δ phase was precipitated at the grain boundaries when the Mo addition is in the range of 2.80% - 4.00%, while the Mo-bearing phase was precipitated at the grain boundaries when the Mo addition is in the range of 5.50% - 7.50%. By pinning the grain boundary, the grain boundary precipitate can effectively prevent the grain growths. So the grains grow rapidly with increase the solution temperature when the grain boundary precipitate is absent. The activation energy value for grain growth of IN718 alloys with different Mo addition is 210 - 255 kJ/mol and the grain growth mechanism is controlled by the self-diffusion. The grain growth exponent reduces with increasing Mo addition.
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