<Sanjooram Paddea - Materials Engineering
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Research / Students / Sanjooram Paddea

Sanjooram Paddea

s.paddea@open.ac.uk
+44 (0) 1908 352796
52796
Venables Room S2037


Student Project

Stress and creep damage evolution in materials for ultra-supercritical power plant


Academic supervisors

Prof. P J Bouchard (OU),
Dr J Francis (OU),
Prof M E Fitzpatrick (OU),
Dr A Paradowska (ISIS),
Dr A Shibli (ETD)

Sanjooram Paddea
Sanjooram Paddea

Background

My name is Sanjooram Paddea (Sanjoo Paddea) and I am originally from Mauritius -a very beautiful small island in the Indian Ocean. I graduated with a first class honours in Aerospace Engineering at the University of Glamorgan and did my postgraduate studies in Materials for the power and aerospace industry at Swansea University. My MRes project was looking at the effect of moisture on carbon fibre composites which was sponsored by Airbus UK.

 

PhD Project

High chromium martensitic steels such as P91 and P92 are increasingly being used in ultra-supercritical power plants because of their improved creep strength. One of the other advantages of these high Chromium steels is reduced section thickness compared with conventional steels which reduces through wall temperature gradients and therefore damage due to fatigue.

Welding is a convenient and economical approach in joining components. However, research has shown that the weldments in this steel are particularly prone to premature failure by Type IV cracking especially in the presence of creep-fatigue interactions. Residual stresses play an important role in the performance of welded structures and are sometimes larger than in-service stresses on which they superimposed.

This PhD project will exploit the potential on neutron and synchrotron radiation measurement techniques at Central facilities. The techniques will be applied to measure fabrication residual stresses at multiple length-scales in high Cr weldments and quantify how they relax during service high temperature exposure, to measure and spatially resolve plastic and creep deformation across weldments, and to quantify volumetrically the evolution of creep cavitation leading to cracking. The project will use ENGIN-X, LOQ and SANS-2D instruments for stress measurements. The scientific challenge in these measurements will be to measure stresses and stress-free lattice parameters in the weld Heat Affected Zone (HAZ) in the presence of chemical, metallurgical and plastic strain.

 

Dissemination and Exploitation

The project will be embedded in the high temperature energy materials research programme at the OU which is linked with the development of British Energy's R5 high temperature assessment procedure. The OU also has strong links with ANSTO (Australian Nuclear Science and Technology Organisation). The results from this project will be published in high quality journals and will be presented at key European and worldwide conferences which will allow rapid dissemination of the results.

 

 

 


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