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Effects of an LBE environment and hold times on the fatigue properties of austenitic and ferritic-martensitic MYRRHA candidate materials (collaboration with SCK-CEN)
50000403v2186
Promoter: Marc Seefeldt

details

Description: Context in the MYRRHA Initiative at SCK•CEN:

Power transients and flow instabilities will induce cyclic stresses in MYRRHA components. The austenitic high strength steel 15-15Ti is today the most probable materials candidate for the cladding of the MYRRHA fuel. The few results available on the weaker 316 L are not useful to predict the fatigue behavior of 15-15Ti under lead-bismuth eutectic (LBE, used as a coolant in nuclear reactors). Ferritic-martensitic T91 steel has been chosen for the core support plate, for the heat exchanger pipes and for the wrappers. The information available on the fatigue of T91 in LBE is very limited. During the thesis work, useful information required by the MYRRHA designers will be collected. A new facility for testing materials under LBE is presently under construction at SCK•CEN. The system will be extensively used in the frame of this study on fatigue.

Objectives:

The objective of the thesis work is to determine the influence of holding times, temperature and LBE O2 content on the fatigue properties of ferritic-martensitic and austenitic steels tested in the LBE environment. While the strong influence of LBE has been demonstrated in the case of ferritic-martensitic steels, the effect on austenitic steels is not sufficiently known. Especially high strength austenitic steels, such as 15-15Ti, have not been studied. The objective of the thesis is to describe crack nucleation and propagation under LBE and the microscopic mechanisms controlling them, in both families of steels. Depending on the influence of impurities and the crystal lattice structure, different physical mechanisms may affect material decohesion at the crack tip. As basic information, the nucleation and growth of the cracks will need to be described and analysed using replica techniques and scanning electron microscopy. A description of the microstructures of the steels using TEM is also part of the work, especially for the 15-15Ti which is not well described in the literature.

Time schedule:

First year:
Literature study on the effects of LBE on materials, introduction to fatigue testing and analysis, study of the general microstructure of the candidate materials with TEM

Second year:
Collection of experimental data in continuous fatigue, analysis of crack nucleation and growth under LBE, using optical and scanning electron microscopy, analysis of results

Third year:
Study of the effect of holding times, analysis of results. Description of the physical mechanisms affecting crack growth and their influence from the O2 content in LBE

Fourth year:
Complementary tests, final analysis and redaction of thesis.

Key words: reactor materials, high strength steels, liquid metal embrittlement, fatigue

Latest application date: 2011-03-25

Financing: available

Type of Position: scholarship

Source of Funding: SCK-CEN

Duration of the Project : 4 years

Link: http://www.sckcen.be/en/yop/view/276

Research group: Department of Metallurgy and Materials Engineering (MTM)

dan

AGEING-RESISTANT ZIRCONIA CERAMICS FOR DENTAL RESTORATIONS
50000403v2181
Promoter: Jef Vleugels

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Description: The strength, toughness and wear-resistance of zirconia, especially yttria-stabilised tetragonal zirconia polycrystalline (Y-TZP) ceramics, are the highest ever reported for any monolithic ceramic. Dental zirconia can be processed using CAD-CAM technology at high precision and relatively low cost, and further possesses excellent biocompatibility and superior aesthetic potential. The extraordinary properties of zirconia are hence highly attractive in prosthetic/restorative dentistry, where strength and aesthetics are paramount.
However, due to the meta-stability of the tetragonal zirconia phase, stress-generating surface treatments are liable to trigger the tetragonal-to-monoclinic ZrO2-phase transformation with an associated volume increase of 3-4 vol %. This leads to surface compressive stresses, thereby increasing the flexural strength, but also altering the phase integrity of the material and increasing the susceptibility to ageing. Low-temperature degradation (LTD) of zirconia, i.e. the transformation of the meta-stable tetragonal to monoclinic ZrO2-phase at temperatures between 20-250°C, is a well-documented phenomenon, exacerbated notably by water. The susceptibility to low temperature degradation however compromises the long term reliability of dental ceramics.

Amongst the envisaged research challenges are;
* Assessing the LTD risk of zirconia ceramics
* Unravelling the mechanisms and kinetics of LTD
* Designing and processing of ageing-resistant zirconia ceramics
* Mechanical and microstructural characterisation of new or modified zirconia ceramics


Key words: Ceramics, zirconia, Low temperature degradation, sintering, powder processing, characterisation

Latest application date: 2011-05-02

Financing: available

Type of Position: scholarship

Source of Funding: 4 year financing is available in the form of a Ph.D. fellowship

Duration of the Project : 4 years

Research group: Department of Metallurgy and Materials Engineering (MTM)

Remarks: Expected Results: A fundamental understanding of the low temperature degradation behaviour of zirconia ceramics and a long term solution by microstructural and compositional engineering.


The researcher will be mainly active at the Department of Metallurgy and Materials Engineering of K.U.Leuven (Prof. Jef Vleugels),(http://www.mtm.kuleuven.be/), and at the Leuven BIOMAT Research Cluster (http://med.kuleuven.be/biomat/), Department of Dentistry, K.U.Leuven (Prof. Dr. Bart Van Meerbeek & Prof. Dr. Ignace Naert)

For further information, please contact Prof. Dr. ir. J. Vleugels or Prof. Dr. Bart Vanmeerbeek. Your application should include a curriculum vitae and a short motivation letter.

Prof. Dr. ir. Jef Vleugels
Phone + 32-16-32 12 44
Jozef.Vleugels@mtm.kuleuven.be
K.U.Leuven, Department of Metallurgy and Materials Engineering Kasteelpark Arenberg 44 - bus 2450, 3001 Heverlee, Belgium

Prof. Dr. Bart Vanmeerbeek
Phone + 32-16-33.75.87
bart.vanmeerbeek@med.kuleuven.be
K.U.Leuven, Department of Conservative Dentistry, Leuven BIOMAT Research Cluster, Kapucijnenvoer 7, K.U.Leuven, B-3000 Leuven,Belgium

udah pada tau kali ye aun-seed, ini lowongan 2011 nye:



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nih shed kalo mau nyusul jejak om HJ

Title: Steel Fibre Reinforced Polymers
50000403v2197

Promoter: Aart Willem Van Vuure

details

Description: This PhD study takes place in the framework of a few applied research projects with a large steel fibre manufacturer and some other industrial partners. The goal of this study is analysis of fine steel fibre composite properties with the background aim to facilitate development of applications by the companies.

Key words: Steel fibres; Composites; Mechanical analysis

Start date: 2011-04-01
Application date: 2011-06-11
Publication date: 2011-03-11

Financing: available

Type of Position: salary

Source of Funding: Industry; government program

Duration of the Project : 2-4 years

Link: http://www.mtm.kuleuven.be/Onderzoek/Composites/news/files/vacaturesfrp-march2011-v2.pdf

Research group: Department of Metallurgy and Materials Engineering (MTM)

Remarks: First aim is a PhD project of 4 years, but splitting the project in sub-projects with project engineers or post-Docs may be considered.