Effect of heat treatment on mechanical properties of alloy 909

• Published in: Materials science and technology 2011-06, Vol.27 (6), p.1092-1097
• Main Authors: Covarrubias, O, Elizarrarás, O, Colás, R
• Format: Article
• Language: English
• Subjects: Aircraft components; Alloys; Chemical precipitation; Heat treating; Heat treatment; Materials science; Mechanical properties; Mechanical testing; Metallurgical analysis; Microstructure; Nickel base alloys; Precipitation; Ring rolling; Rupture tests; Superalloys; Thermal expansion
• ISSN: 0267-0836; 1743-2847
• DOI: 10.1179/026708310X12677993662005

Alloy 909 is a Ni-Fe-Co alloy that exhibits a low coefficient of thermal expansion and high strength at elevated temperatures. These characteristics are suitable for demanding high temperature uses such as turbine components for aerospace and energy generation. The mechanical properties are achieved by heat treatment (solution and aging) that affects the microstructural characteristics such as grain size and precipitation of intergranular and transgranular particles. This work summarises the results of trials conducted to determine the conditions that assure the desired mechanical properties in high temperature ring rolled pieces. Results of tensile, hardness and stress rupture tests are complemented by microstructural analyses. These studies allowed for establishing a robust method for the manufacture of rings; no degradation of the product, either metallurgical or due to properties, has been reported after the method was implemented.