Microalloying influence by lanthanoids on feature of forming of structure grain boundaries and interphase boundaries of γ/γ' heat resisting nickel alloy of the VZh175 type

Chabina E.B.
UDC
669.018.44:669.245
DOI
10.18577/2307-6046-2017-0-2-9-9
Article PDF (Russian) (1.11 MB)
How to cite
Chabina E.B. Microalloying influence by lanthanoids on feature of forming of structure grain boundaries and interphase boundaries of γ/γ' heat resisting nickel alloy of the VZh175 type // Proceedings of VIAM. 2017. No. 2. DOI: 10.18577/2307-6046-2017-0-2-9-9. URL: https://test.viam.ru/en/journal/2017/2/9
Keywords
microalloying, lanthanoids, deformable heat resisting nickel alloys, grain boundary, interphase boundaries.
Abstract

Microalloying influence by lanthanoids (La, Pr, Nd, Gd, Dy, Ho, Lu) on condition of grain boundaries and interphase boundaries of γ/γ' heat resisting deformable alloy of the VZh175 type is researched. It is shown that in all studied compositions in cast condition an additional phase – intermetallic compound on the basis of nickel and REE is present. Phases the structure of which include microdoping elements, remain in the thermoprocessed material, both primary, and secondary, located on grain boundaries and interphase boundaries. It is established by TEM method that nanodimensional intermetallic phases decorate boundaries of large primary γ/γ' -phases, making additional contribution to material hardening. Influence of temperature and tension on condition of grain boundaries and interphase boundaries of alloy of the VZh175 type, including the structures containing different lanthanoids is investigated. After tests at temperatures of 650 and 750°С on the basis of over 1000 hours on gra

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