Effect of Mo Addition on the Grain Growth of IN718 Alloy

Da Wei Han; Fang Liu; Dan Jia; Feng Qi; Hong Cai Yang; Wen Ru Sun; Zhuang Qi Hu

doi:10.4028/www.scientific.net/MSF.816.594

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Microstructure and Mechanical Properties of a New Ni-Cr-Fe-W-Al Alloy for Advanced Ultra-Supercritical Power Plants
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Effect of Mo Addition on the Grain Growth of IN718 Alloy
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Effect of Rhenium on Microstructure of Directionally Solidified Ni-Based Superalloys with High Chromium Content
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Effects of Co on the Solidification and Precipitation Behaviors of IN 718 Alloy
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HomeMaterials Science ForumMaterials Science Forum Vol. 816Effect of Mo Addition on the Grain Growth of IN718...

Effect of Mo Addition on the Grain Growth of IN718 Alloy

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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Periodical:

Materials Science Forum (Volume 816)

Pages:

594-600

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.816.594

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Online since:

April 2015

Authors:

Da Wei Han*, Fang Liu, Dan Jia, Feng Qi, Hong Cai Yang, Wen Ru Sun, Zhuang Qi Hu

Keywords:

Grain Growth Activation Energy, Grain Growth Exponent, Grain Size, Inconel 718, Mo Additions

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