The impurities and lanthanum behavior at directional solidification of single-crystal superalloys

Min P.G., Sidorov V.V., Vadeev V.E.
UDC
669.018.44:669.245
DOI
10.18577/2307-6046-2017-0-7-4-4
Article PDF (Russian) (919.97 KB)
How to cite
Min P.G., Sidorov V.V., Vadeev V.E. The impurities and lanthanum behavior at directional solidification of single-crystal superalloys // Proceedings of VIAM. 2017. No. 7. DOI: 10.18577/2307-6046-2017-0-7-4-4. URL: https://test.viam.ru/en/journal/2017/7/4
Keywords
silicon, phosphorus, ceramic, mold, superalloy, impurities, directional solidification, refinement, neutralization.
Abstract

The silicon, phosphorus and lanthanum behavior during directional solidification of single-crystals ZhS32-VI and VZhM5-VI superalloys for gas turbine blades was studied.

It is proved that saturation with silicon during directional solidification of single-crystals took place for a reason of interaction of carbon with free silicon oxide included in the composition of the ceramic mold. It is founded that saturation with silicon of non-carbon single-crystal alloys occurs four times slower than carbon-containing alloys. The utilization of non-carbon nickel-based superalloys is recommended for high pure provision from silicon impurity and guaranteed high properties of casts.

Experimentally established that lanthanum microalloying of nickel-based superalloys with high phosphorus contain (0,014 wt. %) allows to increase high temperature strength of single-crystals on account strong, refractory compound (lanthanum phosphide) and neutralization harmful phosphorus influence. It is shown that repeated remelting leads to a change in the content of macro- and microalloying elements and consequently reduction in the amount of γ¢-phase and single-crystals service life.

It is recommended to remelt nickel-based superalloys in vacuum induction furnace with optimal composition control by chemical express analysis for provision guaranteed high operational of single-crystals.

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