Grain boundary character correlated carbide precipitation and mechanical properties of Ni-20Cr-18W-1Mo superalloy

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 667; pp. 391 - 401
• Main Authors: Han, Yinben, Xue, Xiangyi, Zhang, Tiebang, Hu, Rui, Li, Jinshan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 14.06.2016
• Subjects: Carbide precipitation; Carbides; Correlation; Exposure; Grain boundaries; Grain boundary character; Mechanical properties; Ni-20Cr-18W-1Mo superalloy; Nickel base alloys; Segregations; Superalloys; Thermal exposure; Mechanical properties; Thermal exposure; Carbide precipitation; Grain boundary character; Ni-20Cr-18W-1Mo superalloy
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2016.05.028

This work illustrates the grain boundary character correlated carbide precipitation and its effect on mechanical properties of a Ni-20Cr-18W-1Mo superalloy. The results show that W segregation and Cr desegregation at grain region promote the secondary M6C-typed carbide precipitation on grain boundaries. The morphologies of the intergranular carbides change from granular to plate-like with increasing of the exposure time at 1100°C. The tensile strength and elongation have developed value peak in a relatively short exposure time within 5h (h). The phase interface cracks in the initial stage and correspondingly deteriorate mechanical properties of the experimental Ni-20Cr-18W-1Mo superalloy during the long time aging process at elevated temperature.