Effect of heat treatment on thermal expansion behavior and mechanical properties of Fe-36Ni Invar alloy foil

doi:10.13251/j.issn.0254-6051.2022.12.004

Abstract

Abstract: Evolution of thermal expansion behavior and mechanical properties of Fe-36Ni Invar alloy foil with thickness of 60 μm under cold rolled, annealed and quenched conditions was investigated, respectively. The results show that the cold rolled alloy has the smallest thermal expansion coefficient, the quenched state is second, and the annealed state has the largest thermal expansion coefficient. Heat treatment can effectively increase the Curie temperature T_c of the alloy to increase the service temperature range, and the specimen quenched at 900 ℃ for 1.5 h has the best thermal expansion properties ($\bar{α}$_(20-100℃)=1.02×10^-6 K^-1, T_c=276 ℃). The rise in the number of free oriented grains is the main reason for the increase of thermal expansion coefficient. Compared with cold rolled state, complete recrystallization and annealing twinning of the alloy occur after heat treatment, accompanied by change in grain size and a rapid increase in the proportion of ∑3ⁿ grain boundaries. The specimen quenched at 800 ℃ for 1.5 h has the smallest grain size (6.6 μm) and the highest proportion of ∑3ⁿ grain boundaries, giving the highest yield strength (267 MPa) and tensile strength (414 MPa). In summary, the comprehensve properties of the quenched specimen are better than that of the annealed specimen. However, under the same heat treatment method, increasing the heat treatment temperature on the one hand reduces the coefficient of thermal expansion and increases the Curie temperature, and on the other hand reduces the strength.

Key words: Fe-36Ni Invar alloy foil, heat treatment, thermal expansion coefficient, mechanical properties

CLC Number:

TG156.1

Cai Chen, Gu Yu, Li Jingyuan. Effect of heat treatment on thermal expansion behavior and mechanical properties of Fe-36Ni Invar alloy foil[J]. Heat Treatment of Metals, 2022, 47(12): 19-27.

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