Project Info

Understanding Localized Deformation in Ni-Based Superalloys for Gas Turbine Disk Applications

Ni-based superalloys are used in gas turbines because of their oxidation resistance and superior strength at high temperatures. In order optimize the efficiency and performance of gas turbines, Ni-based superalloy components must be pushed to the maximum of their capability, which requires an in-depth understanding of their deformation behavior. Under certain conditions, Ni-based alloys can exhibit localized deformation which can lead to diminished performance. The localized deformation manifests itself as serrations in the stress-strain curve in a tensile test. The goal of this project is to understand the origins of localized deformation that accompanies serrated yielding in order to improve the mechanical performance of Ni-based superalloys, which will lead to higher performance, more efficient gas turbine engines.

More Information

Publications related to serrated yielding (also called Portevin-Le Chatlier effect) in Ni-based Superalloys can be found here:

https://doi.org/10.1016/j.jallcom.2016.08.194

https://doi.org/10.1007/s11661-015-3126-7

Grand Engineering Challenge: Not applicable

Student Preparation

Qualifications

The student should be interested in physical and mechanical metallurgy. Experience with literature review, metallographic preparation, microscopy, and mechanical testing would be helpful but not required.

Time Commitment

Time commitment is flexible and can be varied throughout the semester. Approximately 4-5 hours per week, on average, is supported by the MURF, and is the baseline needed to be able to make significant progress on a project. Should the student have interest in additional work beyond 4-5 hours per week, funding through CANFSA may be available for additional hours, up to 20 per week.

Skills/Techniques Gained

This project will provide a student the opportunity to develop several skills that will be useful for graduate school or a career in the field of physical and/or mechanical metallurgy. The student will gain experience in literature review, microstructure characterization (X-ray diffraction, scanning electron microscopy, light optical microscopy), and tensile testing.

Mentoring Plan

The faculty mentor will meet regularly with the student, and in addition, the student will interact with graduate students and faculty in CANFSA on a weekly basis. Realistic goals will be set at the beginning of the project, and they will be continuously updated as needed. The frequent interaction with Mines professors and graduate students will ensure all resources are being provided to ensure the student gets the most out of the project. The student will also be able to interact with scientists at NIST over the course of the project.