Modelling and optimisation of the post-weld heat treatment of gamma ' precipitation and hardness on Inconel X-750 using the response surface methodology

作者：Peasura Prachya^*; Poopat Bovornchok

来源：International Journal of Materials and Product Technology, 2016, 52(3-4): 238-259.

DOI：10.1504/IJMPT.2016.075494

• post-weld heat treatment
• PWHT
• Inconel X-750
• response surface methodology
• gamma ' precipitates size
• hardness

This work describes a post-weld heat treatment (PWHT) for Inconel X-750. The following PWHT variables were examined: the solution temperature, PWHT temperature, and PWHT time. In this research, the application of the response surface methodology and Box-Behnken design in a mathematical model was investigated and optimised. The resulting materials were examined using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM) in the fusion zone (FZ). The experimental results reveal that using a full quadratic model with the proposed mathematical model of the gamma' precipitation size and gamma' hardness in the FZ, the obtained correlation of the hardness and gamma' precipitate size showed a reasonable linear relationship.

• 出版日期2016