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Materials Engineering Group
 


Research / Students / Murat Acar

Murat Acar

m.o.acar@open.ac.uk

+44 (0) 1908 653927

Student Project;
The Effect of Pre-straining and Heat Treatment on Mechanical Properties and Microstructure of Welded 316H Austenitic Stainless Steel Tubes

Academic supervisors; Prof. Mike Fitzpatrick, Prof. John Bouchard and Dr. Salih Gungor

Murat Acar
Murat Acar

My name is Murat Ozgun ACAR. I did my bachelor's degree in Metallurgical and Materials Engineering at Middle East Technical University (METU), Turkey between September 2002 and June 2007. Just after I completed my undergraduate degree, I was hoping to continue my studies abroad for new and challenging experiences and fortunately I joined the Materials Engineering group at OU as a full-time PhD student in January 2008. I am very pleased to study in this group because the working atmosphere is very motivating. All of the people in our group are very sincere, friendly and helpful and since there are no undergraduate students in the campus, OU is a promising place for researchers.

 

Fig. 1 The Strain Distribution in a cross-weld tensile specimen

The title of my research project is “The Effect of Pre-straining and Heat Treatment on Mechanical Properties and Microstructure of Welded 316H Austenitic Stainless Steel Tubes”. This project is funded by British Energy ( http://www.british-energy.com/ ) who supplied the pre-strained and welded tubes to simulate the real life conditions. Power generation plants have many piles of thin-section, small diameter boiler tubes. The tubes require bending and welding to be shaped for the construction of power plants. Additionally, post weld heat treatment is applied to relieve the fabrication residual stresses. Considering all of these pre-processes, the fabrication of these tubes harshly alters the material properties of these tubes. The aim of this project is to obtain the final material properties at room temperature and to understand how each pre-process affect the final properties. For that purpose, we use several experimental techniques;

•  Digital Image Correlation to obtain the tensile properties of cross-weld and parent tensile specimens from these tubes (Fig.1)

•  Neutron diffraction for residual stress and texture measurements

•  Electron Back-Scattered Diffraction (EBSD) for texture and plastic deformation measurements

•  Hardness Measurements

•  Optical and Scanning Electron Microscope (+EDX) for material characterization

• Ferrite meter to measure the amount of ferrite in the weld metal

 

 


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