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A Monte Carlo code for the simulation of neutron strain scanning experiments on a reactor-based two-axis diffractometer is described. In order to validate this code, several experiments have been performed. A comparison is made between experimental and simulated results for instrumental resolution, primary beam divergence and wavelength distribution in the incident neutron beam. Finally, the application of the simulation results to the analysis of a real neutron strain scanning experiment is outlined.

Residual stresses in a cold drawn pearlitic rod of 18 mm in diameter have been studied by synchrotron radiation and neutron diffraction. The aim has been lo characterise the complete residua! stresses, including the total phase stresses, macrostresses and microstresses, due to cold drawing. Bolh techniques have revealed characteristic residual stress profiles along the radius of the rod for the territe phase, while the synchrotron radiation measurement has also produced residual stress profiles for the minor cementite phase (11 "Jf-in weight). Good agreement between the two techniques has been observed. Residual macrostresses derived from the synchrotron measurement show a large variation from center to surface of the rod. The phase stresses for ferrite are dominated by the macrostresses. On the other hand, residual microstresses change less significantly along the radius of the rod and they prevail in the cementite phase.

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