High Temperature Precipitation Kinetics By Stress Relaxation Technique in a Haynes 282

Haynes 282 is designed for high temperature applications, because of its excellent combination of creep strength, weldability and thermal stability; and could be a strong candidate in aeronautical uses. One of the major events that have an impact in the mechanical performance during hot processing is the nucleation and growth of precipitates. In order to understand the effect of the precipitation in this material, stress relaxation technique was done at temperature range from 750°C to 1,000°C and deformed 0.05%. Microstructural characterization to quantify precipitation was performed by means of Scanning Electron Microscopy (SEM). Precipitation-time-temperature (PTT) diagram were constructed in order to define the optimum process temperature. The most significant changes were observed in the sample tested at 950°C.