PhD Thesis Proposal: Andrew Peterson

Tuesday, September 24, 2019, 3:00–5:00pm

Rm 202, Cummings Hall

“Understanding the Deformation Behavior of Alumina-Forming Austenitic Stainless Steels”

Abstract

The objective of this proposal is to study the deformation behavior of alumina-forming austenitic stainless steels. Alumina-forming austenitic stainless steels are a class of steels that have shown promise for high temperature applications – for example, power plants. However, the deformation behavior of these alloys is not well understood because of their complex microstructure. The microstructure features three different precipitates in the austenitic matrix, two different precipitates which cover the grain boundaries, and in some cases a precipitate free zone forms along the grain boundaries. This proposal seeks to understand how these microstructure features affect the strength of the alloy. Experiments in this proposal will be performed on the alloy Fe-20Cr-30Ni-2Nb-5Al. Most testing will be performed at 760 °C based on the US Department of Energy’s goal for the next generation of steam power plants. However, some tests will also be conducted at room temperature. Gaining a better understanding of the deformation behavior of this alloy will enable the design of an AFA alloy which optimizes its mechanical properties for high temperature applications.

Thesis Committee

For more information, contact Daryl Laware at daryl.a.laware@dartmouth.edu.