High temperature environmental stress corrosion cracking of Nickel superalloys

23 March 2021 1pm – 2.30pm
Webinar

 

The aerospace industry relies heavily on the development of test methods that support the understanding behind the many environmental issues that reduce component lives. This webinar sets out some of the work that has so far gone into developing a static stress corrosion test that is being used to understand some of the key parameters affecting crack initiation in representative turbine blade environments. The main focus of this webinar will be on work that is being undertaken to understand crack initiation below 600°C.  

The aim of this webinar is to explain the rationale behind the use and modification of a simple test method to assess stress corrosion cracking of single crystal Nickel based superalloys at temperatures ranging from 400-600°C. The webinar covers key elements of test specimen design, its implementation, and inspection methods used to characterise these materials when under constant loads in corrosive environments.

Preliminary results are presented comparing the effect of different salt compositions on the degradation and cracking of single crystal Nickel based superalloys. An overview is given of the inspection techniques used to quantify degradation after various times at elevated temperatures.

The webinar provides an overview of some of the key benefits and outputs from initial testing carried out so far. The research described provides a platform for the many outstanding questions to be considered and potential mechanistic theories debated.


You will hear from:

  • Grant Gibson will be presenting an overview of Rolls-Royces Project requirements and specific aims linked to the design of a test enabling mechanistic understanding.
  • Nic Morar will continue with an overview of how a test methodology was developed to meet these aims
  • Fabian Duarte Martinez will present results from his PhD that have fed into this understanding
  • Jonathan Leggett will conclude the webinar with some of the ongoing challenges, and next steps as we move the technology forward, including future inspection requirements. 


Who should attend?

The webinar is aimed at technical / design / material / professionals in the energy / gas turbine industry. 

Key learning objectives

  • A test method is described for assessing high temperature materials under stress corrosion conditions.  
  • Preliminary results are presented that highlight the effect of several salt compositions on the degradation and cracking of single crystal superalloys at 550°C.  
  • An overview is provided of some of the analytical techniques used to assess samples post testing, the key focus being on being able to describe the mechanisms contributing to crack initiation.