世界名校曼彻斯特大学招博士，提供资助（全球学生）
(CDT Advanced Metallic Systems) Understanding the Stress Corrosion Cracking Performance of Ultra-High Strength Aerospace Steels
The University of Manchester Department of Materials
About the Project
This project is based at the Department of Materials at the University of Manchester, and is sponsored by Airbus UK. We are seeking a UK national with a 2.1 or 1st class degree in a STEM discipline.
This project is supported by Airbus UK and will contribute to their underpinning research in de-risking the application of new advanced ultra-high strength steel components in airframe applications. The research will be supervised through the Advanced Metallic Research Programme (AMRP) within Airbus Airframe R&T.
Ultra high-strength maraging stainless steels, are the strongest bulk metal alloys currently in existance. They can have yield strengths between 1500 - 2000 MPa and are widely used in landing gear components, because of their far higher performance in compressive loading compared to composite materials. Such materials are subject to a complex processing route to optimise their performance, which involves forging, and heat treatment to develop a quenched and tempered martensitic microstructure. This produces a ‘natural’ bulk nanomaterial which has a unique microstructure comprised of packets of very small submicron ferrite grains strengthened by nano-scale precipitates.
The steels are self-protected against corrosion by the formation of a thin passivating surface chromium oxide film. However, there is still a major concern regarding their susceptibility to Environmentally Assisted Cracking (EAC) in-service which is related to failure of the protective film in certain environments, when under stress. This can lead to local pitting attack and hydrogen charging which can cause cracks to develop through hydrogen embrittlement.
The aim of this project is to enhance the mechanistic understanding of EAC of high strength Maraging steels exposed to aqueous environments and to elucidate the role of microstructure on the materials performance that could be used for the optimization of future alloys (although the development of new alloys is not covered in this project). This will be realised by conducting a range of accelerated laboratory tests, combined with high resolution advanced microscopy, to develop a better understanding of the mechanisms involved in these complex materials.
The materials used for this project will be a selection of precipitation hardened, high-strength, steels which have different, performance properties, and microstructural and precipitation strengthening phases (e.g. Cu in 15-5 PH and NiAl PH13-8Mo). These materials will be microstructurally pre-characterized and tested in aqueous chloride containing environments to obtain electrochemical, corrosion, and stress corrosion cracking properties. Advanced electron microscopy analysis tools will be applied, in parallel with the testing programme, to understand the failure process and relationship to the materials microstructure, microchemistry, and hydrogen trapping behaviour. Given the possible very large number of variables, the philosophy of this project will be to investigate extreme conditions and identify the trends, as opposed to systematically investigating every possible combination.
The Centre for Doctoral Training in Advanced Metallic Systems is a partnership between industry and the Universities of Sheffield, Manchester and I-Form Advanced Manufacturing Centre, Dublin. CDT students undertake a 4-year doctorate with an in-depth compulsory technical and professional skills training programme. Please review our training programme, application process and full entry requirements at http://www.metallicscdt.co.uk. Please note, application is only via the University of Manchester (see website), and general enquiries can be made to the CDT (enquiries@metallics.co.uk). For more information on the research scope of the project please contact Fabio Scenini at fabio.scenini@manchester.ac.uk
Equality, diversity and inclusion is fundamental to the success of The University of Manchester, and is at the heart of all of our activities. We know that diversity strengthens our research community, leading to enhanced research creativity, productivity and quality, and societal and economic impact. We actively encourage applicants from diverse career paths and backgrounds and from all sections of the community, regardless of age, disability, ethnicity, gender, gender expression, sexual orientation and transgender status.
We also support applications from those returning from a career break or other roles. We consider offering flexible study arrangements (including part-time: 50%, 60% or 80%, depending on the project/funder).
All appointments are made on merit.
Please note that this project will close before the advertised end date if a suitable applicant is secured. We suggest that you do not delay submitting your application.
Funding Notes
This is a 4 year PhD studentship covering fees and stipend (£15,609 in 2021-22) plus £3,250 per year top-up. Funding will cover UK tuition fee and stipend only. The University of Manchester aims to support the most outstanding applicants from outside the UK. We are able to offer a limited number of scholarships that will enable full studentships to be awarded to international applicants. These full studentships will only be awarded to exceptional quality candidates, due to the competitive nature of this scheme.
Start date: September 2022
Dr F Scenini, Prof P Prangnell
Tuesday, May 31, 2022
Funded PhD Project (Students Worldwide)
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