Microstructure Variation in the Arc-Melted Cr-Cr2Nb Hypereutectic Alloy

Ke Wei Li; Shuang Ming Li; Yun Long Xue; Heng Zhi Fu

doi:10.4028/www.scientific.net/AMR.548.328

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 548Microstructure Variation in the Arc-Melted...

Microstructure Variation in the Arc-Melted Cr-Cr₂Nb Hypereutectic Alloy

Abstract:

Microstructure of the arc-melted Cr-20at%Nb alloy solidified in different positions was investigated using optical microscope (OM) and scanning electron microscope (SEM). The results show that fully coupled eutectic was developed at the bottom of the ingot and then the eutectic experienced a columnar to equiaxed transition due to the decrease of G/V ratio (G the thermal gradient and V the solidification rate) with increasing the solidification distance. A novel lamellar structure was observed in the middle side of the arc-melted ingot, which may form by means of the eutectoid reaction of C14-Cr₂Nb→C15-Cr₂Nb+Crss. With the increase of the solidification distance from the middle side to the top side, the primary Cr₂Nb phase underwent a nonfaceted to faceted transition.

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Periodical:

Advanced Materials Research (Volume 548)

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328-332

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https://doi.org/10.4028/www.scientific.net/AMR.548.328

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Online since:

July 2012

Authors:

Ke Wei Li, Shuang Ming Li, Yun Long Xue, Heng Zhi Fu

Keywords:

Arc Melting, Columnar to Equiaxed Transition, Laves Phase, Solidification Rate

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