Study on Non-Equilibrium Grain-Boundary Segregation of Sulfur among Hastelloy X

Abstract:

Sulfur is the main element which caused Nickel-based alloy embrittlement. In this study, the sulfur in Hastelloy X superalloy was determinated with Auger Electron Spectroscopy (AES) for samples quenched from 1180 °C and aged at 500 °C for different time. Experiments results confirmed the non-equilibrium segregation characteristics of sulfur. The results showed that a segregation peak of sulfur is at about 20 min during ageing. This peak was satisfactorily elucidated by the theory of non-equilibrium grain-boundary segregation. By theoretical calculation, the critical time constant of impurities sulfur atom in the Hastelloy X δs= 357. At the same time, the result provides a theoretical basis for sulfur segregation mechanism.

• Periodical: Advanced Materials Research (Volumes 181-182)
• Pages: 861-865
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.181-182.861
• Online since: January 2011
• Authors: Ming Yang, Yu Jing Nie
• Keywords: AES, Hastelloy X, Non-Equilibrium, Segregation, Sulfur

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