Abstract
Ni58Cr32Fe10-based alloys, such as Alloy 690 and filler metal 52 (FM-52), suffer from ductility dip cracking (DDC). It is reported that decreasing the stacking fault energy (SFE) of these materials could improve the DDC resistance of Alloy 690. In this work, the effects of alloying elements on the stacking fault energies (SFEs) of Ni58Cr32Fe10 alloys were studied using first-principle calculations. In our simulations, 2 at.% of Ni is replaced by alloy element X (X=Al, Co, Cu, Hf, Mn, Nb, Ta, Ti, V, and W). At a finite temperature, the SFEs were divided into the magnetic entropy (SFEmag) and 0 K (SFE0) contributions. Potentially, the calculated results could be used in the design of high-performance Ni58Cr32Fe10-based alloys or filler materials.
Highlights
Ni–Cr–Fe alloys have excellent mechanical and anti-corrosion properties
We suggest that the stacking fault energy (SFE) (61.0 mJm−2 ) of Alloy equilibrium volume and the most apparent decrease in SFE
SFEAl and these elementsthe can be of ordered inFeterms of SFE decreasing our results reveal and
Summary
Ni–Cr–Fe alloys have excellent mechanical and anti-corrosion properties. They are extensively used in the aerospace, power generation, and transportation industries. Nuclear energy plays a critical role in modern society because fossil fuels (like coal, oil, and gas) might run out shortly. Nuclear reactors’ construction materials should have excellent anti–corrosion properties to the intergranular stress corrosion cracking (IGSCC). In the 1950s, Ni-based Alloy 600 was developed to replace 304 stainless steels in nuclear reactor constructions. Researchers found that Alloy 690 has even better resistance to IGSCC [1,2,3,4,5,6]
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