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Steven Van Petegem

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Publications associées (34)

Grain size and alloying effects on dynamic recovery in nanocrystalline metals

Helena Van Swygenhoven, Steven Van Petegem

Dynamic recovery in nanocrystalline Ni and Ni50Fe50 with respective grain sizes of 65 rim and 15 nm is studied using stress reduction tests during in situ X-ray diffraction. The results are compared with a previous study on NC Ni with 35 nm grain size. Def ...

Pergamon-Elsevier Science Ltd2016

On the origin of cementite diffraction peak broadening during tensile deformation at ambient temperatures

Helena Van Swygenhoven, Michael Andreas Weisser, Steven Van Petegem

We report on the diffraction peak shape evolution from cementite particles in three steel microstructures, recorded during in-situ tensile deformation at room temperature. We demonstrate that in a bainitic tempered steel the observed peak broadening and as ...

Pergamon-Elsevier Science Ltd2015

Origin of Anomalous Slip in Tungsten

Helena Van Swygenhoven, Cécile Renée Maria Marichal, Steven Van Petegem

Low-temperature deformation of body-centered cubic metals shows a significant amount of plastic slip on planes with low shear stresses, a phenomenon called anomalous slip. Despite progress in atomistic modeling of the consequences of complex stress states ...

American Physical Society2014

Measurement of residual stresses around the notch of tensile specimens of the high-Cr tempered martensitic steel F82H-mod

Philippe Spätig, Nazar Ilchuk, Steven Van Petegem, Vadim Davydov

Residual elastic strains were measured by neutron diffraction using POLDI facility at PSI-Switzerland on pre-loaded notched flat tensile specimens made of the high-chromium tempered martensitic steel F82H-mod steel. To calculate the residual stresses using ...

2014

Measurement of residual stresses around the notch of tensile specimens of the high-Cr tempered martensitic steel F82H-mod

Philippe Spätig, Nazar Ilchuk, Steven Van Petegem, Vadim Davydov

Residual elastic strains were measured by neutron diffraction using POLDI materials science diffractometer at PSI-Switzerland on pre-loaded notched flat tensile specimens made of the high-chromium tempered martensitic steel F82H-mod steel. To calculate the ...

Trans Tech Publications Ltd2014

{110} Slip with {112} slip traces in bcc Tungsten

Helena Van Swygenhoven, Camelia Borca, Cécile Renée Maria Marichal, Steven Van Petegem

While propagation of dislocations in body centered cubic metals at low temperature is understood in terms of elementary steps on {110} planes, slip traces correspond often with other crystallographic or non-crystallographic planes. In the past, characteriz ...

Nature Publishing Group2013

Microstructure and deformation mechanisms in nanocrystalline Ni-Fe. Part I. Microstructure

Helena Van Swygenhoven, Steven Van Petegem

We investigate various microstructural features of nanocrystalline electrodeposited Ni-Fe with a nominal iron content of 50% and compare them with the well-known nanocrystalline Ni system. In-depth electron microscopy analysis reveals the existence of larg ...

Pergamon-Elsevier Science Ltd2013

Microstructure and deformation mechanisms in nanocrystalline Ni-Fe. Part II. In situ testing during X-ray diffraction

Helena Van Swygenhoven, Steven Van Petegem

Deformation mechanisms in nanocrystalline electrodeposited Ni (26 nm) and Ni-Fe (12 nm) are studied by strain rate sensitivity experiments and in situ mechanical testing during X-ray diffraction. We find a relatively low strength for Ni-Fe, which may be as ...

Pergamon-Elsevier Science Ltd2013

Two strain-hardening mechanisms in nanocrystalline austenitic steel: An in situ synchrotron X-ray diffraction study

Helena Van Swygenhoven, Michael Andreas Weisser, Steven Van Petegem, Patrick Schloth

The mechanical behaviour of nanocrystalline austenitic steels with and without yttria particles was investigated using in situ synchrotron diffraction during tensile deformation. Two different strain-hardening regimes were found. The first regime can be as ...

2012

Slip in directionally solidified Mo-alloy micropillars-Part II: Pillars containing defects

Helena Van Swygenhoven, Camelia Borca, Steven Van Petegem

In situ Laue analysis during microcompression is carried out on Mo-alloy pillars containing defects due to focused ion beam milling or pre-strain. Independently of how the defects are introduced, if the diffraction peaks are streaked prior to deformation, ...

2012

Slip in directionally solidified Mo-alloy micropillars - Part I: Nominally dislocation-free pillars

Helena Van Swygenhoven, Camelia Borca, Cécile Hébert, Barbora Bártová, Emad Oveisi, Cécile Renée Maria Marichal, Steven Van Petegem

In situ Laue analysis during microcompression reveals plasticity in [0 0 1]-oriented, directionally solidified Mo alloy pillars to start with slip on the {1 1 2} < 1 1 1 > system having the highest Schmid factor followed by slip on the (1 1 0) plane contai ...

Elsevier2012

In situ room temperature tensile deformation of a 1% CrMoV bainitic steel using synchrotron and neutron diffraction

Helena Van Swygenhoven, Michael Andreas Weisser, Steven Van Petegem

Neutron and synchrotron X-ray diffraction spectra have been acquired during room temperature tensile deformation of a creep-resistant bainitic 1% CrMoV steel, in order to study the evolution of internal microstresses and load-sharing mechanisms between the ...

2011

The use of Laue microdiffraction to study small-scale plasticity

Helena Van Swygenhoven, Steven Van Petegem

Micromechanics is a booming research area experiencing the development of new advanced testing methods at small dimensions A relatively young but very popular technique involves uniaxial compressing micrometer and sub-micrometer sized objects, usually in t ...

Springer, Springer US2010

Defect structure in micropillars using X-ray microdiffraction

Thomas Lehnert, Martinus Gijs, Helena Van Swygenhoven, Steven Van Petegem

AIP American Institute of Physics2006

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