Cavity Nucleation and Growth in Nickel-Based Alloys during Creep

Author:

Meixner FelixORCID,Ahmadi Mohammad Reza,Sommitsch ChristofORCID

Abstract

The number of fossil fueled power plants in electricity generation is still rising, making improvements to their efficiency essential. The development of new materials to withstand the higher service temperatures and pressures of newer, more efficient power plants is greatly aided by physics-based models, which can simulate the microstructural processes leading to their eventual failure. In this work, such a model is developed from classical nucleation theory and diffusion driven growth from vacancy condensation. This model predicts the shape and distribution of cavities which nucleate almost exclusively at grain boundaries during high temperature creep. Cavity radii, number density and phase fraction are validated quantitively against specimens of nickel-based alloys (617 and 625) tested at 700 °C and stresses between 160 and 185 MPa. The model’s results agree well with the experimental results. However, they fail to represent the complex interlinking of cavities which occurs in tertiary creep.

Funder

Graz University of Technology

Publisher

MDPI AG

Subject

General Materials Science

Reference51 articles.

1. Materials for Ultra-Supercritical and Advanced Ultra-Supercritical Power Plants;Di Gianfrancesco,2016

2. Mechanisms of Deformation and Fracture;Ashby,1983

3. High-Temperature Creep-Fatigue Behavior of Alloy 617

4. Mechanical Behavior of Inconel 625 at Elevated Temperatures

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