The effect of boron and zirconium on the microstructure and tensile properties of Nimonic 105 superalloy
- 1 September 2019
- journal article
- research article
- Published by IOP Publishing in Materials Research Express
- Vol. 6 (11), 116540
- https://doi.org/10.1088/2053-1591/ab4676
Abstract
In the present study, the effects of boron and zirconium on the microstructure and high-temperature tensile properties of Nimonic 105 superalloy were evaluated. For this purpose, three alloys with different contents of boron and zirconium (0.003 wt.% B-0 wt. % Zr, 0.013 wt.% B-0 wt.% Zr, 0.003 wt.% B- 0.16%wt.% Zr) were prepared via VIM+ ESR process. Optical and scanning electron microscopes, X-ray diffraction analysis and tensile testing at 25 and 700 ̊C were used to describe the alloys structure and properties. The results showed that the microstructure of the 0.003 wt.% B-0 wt. % Zr alloy consisted of thin-film (Cr, Mo)23C6 and blocky (Ti, Mo)C phases in the γ matrix. The addition of zirconium changed the type of carbide to MC one while boron improved the formation of discrete M23C6-type carbide. The XRD analysis results revealed an increase in the lattice misfit of the γ/γ´ phase for the B and Zr-added alloy, a decrease in the M23C6/γ misfit for the B-added alloy and the MC/γ phase misfit for the Zr-added alloy. In addition, a significant effect of zirconium on grain size were observed in the alloys. Boron and zirconium decreased the ductility at room temperature by 3 % and 6 % and increased it at 700 ̊C by 7 % and 13 %, respectively. Moreover, boron and zirconium increased the high-temperature yield strength by 9 % and 13% and ultimate tensile strength by 9 % and 16 %, respectively.Keywords
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