James Marrow

University of Oxford, Materials, Faculty Member

Followers

4,920

Following

Co-authors

Public Views

My research is focussed on the degradation of structural materials and the role of microstructure. A significant proportion of this work is related to materials utilised in the nuclear industry. This work has been funded by organisations including EPSRC, Rolls- Royce, British Energy, EdF, the Health and Safety Executive (Nuclear Installations Inspectorate) and the Nuclear Decommissioning Authority. A key aspect is the investigation of fundamental mechanisms of damage accumulation using novel materials characterisation techniques. This has concentrated recently on computed X-ray tomography and strain mapping by digital image correlation.
Address: Department of Materials
University of Oxford

less

Related Authors

Tommaso Melodia

SUNY: University at Buffalo

Nagamani Jaya Balila

Max Planck Institute for Iron Research

Alberto Pimpinelli

Université Clermont Auvergne

Estela Blaisten-Barojas

George Mason University

W. Clem Karl

Boston University

John Clark

Loyola University New Orleans

michele ciavarella

Politecnico di Bari

Michael Ralph

New York University

Armando Marques-Guedes

UNL - New University of Lisbon

R. L. Narayan

Indian Institute of Technology Delhi

InterestsView All (22)

Uploads

all
433 Papers
57 Conference Papers
10 Talks
11 Articles
More
- 10 PhD Theses
- 3 Book Chapters

Articles by James Marrow

Quantifying crack behaviour within nuclear graphite

Diamond Light Source Annual Review 2013/14, Jun 30, 2014

Fracture of materials can be the life-limiting factor in engineering structures, and so has been ... more Fracture of materials can be the life-limiting factor in engineering structures, and so has been the topic of numerous research investigations in the past 50 years. Until recently, in situ observations of fracture behaviour were generally confined to the surfaces of materials despite the fact that many fracture processes occur within them. It is therefore highly desirable to apply methods, such as X-ray computed tomography, by which the damage development can be observed within materials, and more importantly, quantified. Such observations expand our understanding of how damage occurs and the factors that are dominant in damage development. With this knowledge we may design new materials that are more resistant to fracture, and improve the accuracy of the integrity assessments of existing structures, necessary to extend their economic lives safely. Structural integrity assessment is particularly important for the UK’s ageing fleet of nuclear reactors; these are predominantly of the Advanced Gas-cooled Reactor (AGR) design in which nuclear graphite is used as neutron moderator and reflector. In this research, the three-dimensional fracture behaviour of nuclear graphite was studied by synchrotron X-ray computed tomography combined with digital volume correlation. This study has demonstrated and quantified, for the first time, the distributed damage in the fracture process zone formed ahead of the crack. Material properties are monitored in small test specimens of graphite extracted from the reactor in order to assess the structural integrity of the much larger components that make up its core, and so the fracture process zone is important as it controls the energy of fracture and the sensitivity of fracture behaviour to specimen size.

DownloadEdit

A new dimension in short fatigue crack characterisation

ESRF Highlights 2011, 2011

A brief article for the general reader explaining how combined use of synchrotron techniques prov... more A brief article for the general reader explaining how combined use of synchrotron techniques provides insight into the mechanisms of fatigue.

DownloadEdit

Understanding the Jominy end quench test

Industrial Heating (USA), Jan 1, 2001

The Jominy end quench test is used to measure the hardenability of a steel. This article consider... more The Jominy end quench test is used to measure the hardenability of a steel. This article considers the basic ideas of hardenability, and the Jominy test. It also discusses how the information obtained from the Jominy test can be used to understand the effects of alloying and microstructure in steels. The article is based on an on-line tutorial for undergraduate materials science students, which includes video demonstrations of the test (http://www.umist.ac.uk/intmic/).

DownloadEdit

$Research paper thumbnail of Grain mapping of stress corrosion cracks by diffraction contrast tomography$

Grain mapping of stress corrosion cracks by diffraction contrast tomography

ESRF Highlights: 2009 (pp 110-111), 2009

"Diffraction contrast tomography was used to map the grain shapes and orientations in a polycryst... more "Diffraction contrast tomography was used to map the grain shapes and orientations in a polycrystalline stainless steel sample, revealing the crystallographic character of the grain boundaries.
We could then grow an intergranular stress corrosion crack in the sample, and make in situ tomographic observations of how the crack interacted with the microstructure, revealing which boundary types tend to resist crack propagation."

DownloadEdit

Got it Cracked?

Materials World (August 2009) pp32-33, Aug 2009

"Stress corrosion cracking is difficult to study and forecast, James Marrow, Senior Lecturer in P... more "Stress corrosion cracking is difficult to study and forecast, James Marrow, Senior Lecturer in Physical
Metallurgy at The University of Manchester explores solutions"

DownloadEdit

RESEARCH ACTIVITIES OF THE NUCLEAR GRAPHITE RESEARCH GROUP AT THE UNIVERSITY OF MANCHESTER UK

by James Marrow and Barry Marsden

Basic studies in the …, Jan 1, 2004

In 2001 the Nuclear Safety Division (NSD) of the UK Health and Safety Executive (HSE) decided to ... more In 2001 the Nuclear Safety Division (NSD) of the UK Health and Safety Executive (HSE) decided to underwrite the Nuclear Graphite Research Group (NGRG) at the University of Manchester, UK with the aim of providing a source of independent research and advice to the HSE(NSD). Since then the group has rapidly expanded to sixteen members and attracted considerable funding from the nuclear power industry and the regulator for a wide range of research and consultancy work. It is now also part of the Material Performance Centre within the BNFL Universities Research Alliance. Extensive collaboration exists between the group and other nuclear research institutes, both in the UK and overseas.

This paper briefly describes some of the research programmes being carried out by the NGRG at Manchester.

DownloadEdit

Logging on to electron microscopy

Improvements in web technology have enabled the creation of an internet microscopy site that resp... more Improvements in web technology have enabled the creation of an internet microscopy site that responds to direct commands from users, even when examining objects via electron microscopy. All the samples were recorded at a range of magnifications and have simple explanations of their microstructure and how it relates to other relevant samples in the library. Thus, the development of an internet electron microscope aims to take this concept further and offer electron microscopy to school and colleges via the internet.

Edit

Everlasting cast copper coolers for the blast furnace

Comparing the mechanical properties of copper castings that had been in service for over 10 years... more Comparing the mechanical properties of copper castings that had been in service for over 10 years as cooling plates in a blast furnace showed that operational service conditions appear to have no effect on the mechanical properties of the cast copper. Any differences measured between newly cast and ex-service cast coppers can be attributed to differences in grain size in the castings.

Edit

Peerless probing into the micro world

by James Marrow and Brian Derby

Materials World Volume 8, Issue 7, 2000, Pages 20-22, Jan 1, 2000

Studying materials microstructures is extremely important. They form a vital link in the processi... more Studying materials microstructures is extremely important. They form a vital link in the processing/properties/structure inter-relationship that is at the heart of materials science. To further improve probing into the micro world, UMIST and the University of Manchester are using the Internet to provide a hands-on educational resource otherwise unavailable to students. The venture, the Internet Microscope, is a teaching resource to help students learn about microstructures, an image library that attempts to reproduce most of the features of a real microscope.

DownloadEdit

The Internet Microscope

Proceedings RMS, 35 (1) pp65-68, Mar 2000

A short article on the Internet Microscope - a website with images of materials for use in schools.

DownloadEdit

Corrosion Fatigue Behaviour of Duplex Stainless Steels

Stainless Steel Europe, Jun 1991

Duplex stainless steels (DSS) are well known for combining some of the best properties; strength,... more Duplex stainless steels (DSS) are well known for combining some of the best properties; strength, toughness and corrosion resistance, of both austenitic and ferritic stainless steels. Increasing use is being made of DSS in aggressive environments, for example in chemical and processing plant and in the offshore industry. When selecting steels for such applications, properties such as resistance to localised corrosion and stress corrosion cracking under internal residual stresses or imposed static loads will be considered. However, these properties may not give an accurate picture of performance in situations where cyclic loading is experienced in corrosive environments, i.e. where corrosion fatigue can occur.

DownloadEdit

James Marrow

Uploads

Articles by James Marrow

Log In