Effects of V addition on the mechanical properties at elevated temperatures in a γ

doi:10.1016/j.jmst.2021.08.024

Abstract

Abstract:

NiCoCr-based multi-component alloys have drawn much attention due to their exceptional ductility and strain hardening capacity. However, insufficient strength-ductility synergy of NiCoCr alloy has always been an issue that prevents it from extensive applications. According to our previous research, the precipitation of γ" phase can significantly improve the strength-ductility synergy of this alloy system at room temperature. In this study, the effects of V addition on γ" phase stability and high-temperature mechanical properties have been explicitly investigated. The results indicate that V addition can stabilize the metastable γ" phase in this alloy system and prevent it from transforming into a stable δ phase at grain boundaries upon 650 °C aging, resulting in improved mechanical properties at elevated temperatures. The specific strength of γ"-strengthened multi-component NiCoCr-based alloy can reach up to 86.2 MPa g ^-1 cm^-3 at 650 °C, which is higher than those of Ni-based superalloys, IN 939 and Waspaloy. This work provides theoretical guidance for the novel design of γ"-strengthened alloy for high-temperature applications.

Key words: Multi-component alloys, CALPHAD, γ" phase;, Microstructural evolution, High-temperature mechanical properties

Yunwei Pan, Anping Dong, Yang Zhou, Dafan Du, Donghong Wang, Guoliang Zhu, Baode Sun. Effects of V addition on the mechanical properties at elevated temperatures in a γ"-strengthened NiCoCr-based multi-component alloy[J]. J. Mater. Sci. Technol., 2022, 107: 290-300.

Figures/Tables 10

Fig. 1. Calculated equilibrium phase diagrams for: (a) Ni(52-x) Co24Cr24Nbx (x: 0-10 at.%); (b) Ni(52-x) Co22Cr22Nb4Vx (x: 0-20 at.%).

Fig. 2. BSE images of Ni2CoCr-4Nb alloy aged at 650 °C for different time: (a, a1) 0 h; (b, b1) 12 h; (c, c1) 48 h; (d, d1) 72 h.

Fig. 3. BSE images of Ni2CoCr-4Nb4V alloy aged at 650 °C for different time: (a, a1) 0 h; (b, b1) 12 h; (c, c1) 48 h; (d, d1) 72 h.

Fig. 4. X-ray diffraction patterns for alloys aged at 650 °C for 48 h: (a) Ni2CoCr-4Nb; (b) Ni2CoCr-4Nb4V. TEM DF images of alloys aged at 650 °C for 48 h: (a1) Ni2CoCr-4Nb; (b1) Ni2CoCr-4Nb4V. SADPs along [001] zone axes of aged alloys: (a2) Ni2CoCr-4Nb; (b2) Ni2CoCr-4Nb4V.

Table 1 Composition of the γ and γ" phases in presented alloys.

Alloy designation	Compositions (at.%)
Alloy designation	γ	γ"
Ni₂CoCr-4Nb	Ni-26.1Co-23.9Cr-2.3Nb	Ni-23.5Co-7.9Cr-13.7Nb
Ni₂CoCr-4Nb4V	Ni-22.5Co-24.1Cr-2.6Nb-3.8V	Ni-19.2Co-5.2Cr-15.9Nb-5.6V

Fig. 5. DTA heating curves obtained from 650 °C/48 h aged Ni2CoCr-4Nb and Ni2CoCr-4Nb4V alloys.

Fig. 6. BSE images of Ni2CoCr-4Nb and Ni2CoCr-4Nb4V alloys aged at 1000 °C for 12 h.

Fig. 7. SEM-EDS elemental distribution mappings of Ni, Co, Cr, Nb and V in 1000 °C/12 h aged alloys: (a) Ni2CoCr-4Nb; (b) Ni2CoCr-4Nb4V.

Fig. 8. (a) Comparison of Vickers microhardness of alloys under different heat treatment regime; (b) Comparison of density between presented alloys and commercial NiCoCr-based superalloys.

Fig. 9. (a) Mean CTE of the Ni2CoCr-4Nb and Ni2CoCr-4Nb4V. Comparison of (b) the yield strength and (c) specific yield strength versus temperature curves of Ni2CoCr-4Nb, Ni2CoCr-4Nb4V, Waspaloy [16] and IN 939 [72].

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