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This research focuses on the use of X-ray diffraction in the study of pressures brought to bear in perlitic material at various levels. These pressures are divided into the following three types: type I being those which are global pressures at the level of the item itself; type II, those at the level of the grain in ferrite and cementite phases; and type III, microscopic pressures. The evaluation of pressures of type II in perlite can easily be carried out by diffraction of X-rays in the ferrite phase of perlite, as can those of type III. It has been shown that an evaluation of the pressures of type II in the cementite phase of perlite is only possible with very strong X-rays (Synchrotron) which means that, for reasons of practicality, it is necessary to resort to calculations. The measurements made in situ meant that the Bauschinger effect could be characterized. This relates to the way in which the differences in behaviour between the ferrite and cementite phases of perlite affect the degree of elasticity of a previously cold-hammered sample. The results of the research - which explain the characteristics of material under stress - need to be further developed in order to attain a full picture of the pressures of the two types.

Additional information

Authors: BETTEMBOURG J P, Unimetal recherches;BELASSEL M, Laboratoire de microstructure et mecanique des materiaux;LEBRUN J L, Laboratoire de microstructure et mecanique des materiaux;MASSICART L, Laboratoire de science et genie des materiaux metalliques;DENIS S, Laboratoire de science et genie des materiaux metalliques
Bibliographic Reference: EUR 18641 FR (1999) 60pp
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-5140-0
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