Abstract
Ni-based superalloys, including Alloy 625, are known for their high strength and excellent resistance to corrosion at high temperatures. Alloy 625 is widely used in geothermal, petrochemical, and power generation industries due to its exceptional performance in harsh environments. It is an austenitic alloy composed of Ni, Cr, Mo, and Nb, with high Cr content (~20 wt%) contributing to its superior corrosion resistance, and solid solution strengthening is attributed to the presence of other alloying elements such as Mo, Nb, and Fe. However, during welding with Alloy 625, Mo and Nb tend to segregate aggressively towards the liquid. This study will investigate the effect of reducing the level of Nb in commercial alloy 625 for weld overlay cladding on carbon-manganese steel. The CALPHAD method will be used to obtain the phase equilibria by thermodynamic simulations of compositions ranging from 0% to 100% dilution. This study is crucial to the weld overlay cladding sector as it aims to identify the best properties of CRA material suitable for highly corrosive environments.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference10 articles.
1. H. L. Eiselstein and D. J. Tillack, "The Invention and Definition of Alloy 625," p.1–14, 2012.
2. H. Rehman, Solid Solution Strengthening and Diffusion in Nickel- and Cobalt-based Superalloys. 2016.
3. ASSESSMENT OF CORROSION RESISTANT ALLOY (CRA) CLAD MATERIAL FOR GEOTHERMAL WELLHEAD PIPING SYSTEM;Tayactac;ASEAN Engineering Journal,2022
4. S. Tin et al., Superalloys 2020, vol. 53, no. 9. 2013.
5. R. G. Tayactac and M. C. Manuel, "Understanding Material Selection Challenges in Geothermall Well and Systematic Qualification Approach," 2022.