Abstract
The paper outlines the capability of X-ray diffraction (XRD) for evaluation of real structure changes and residual stresses (RS) on cross-section of advanced thick welds due to the welding of ferromagnetic plates. The results of neutron diffraction describe a three-dimensional state of RS and also verify previous assumptions of RS redistribution as a result of the surface preparation for determination 2D maps measured by XRD.
Highlights
High local residual stresses existing in components could have vital influence on its properties
Global residual stresses (RS) exist in the entire component and they are resulting from shrinkage processes which occur in the whole component [1]
To verify the results obtained by X-ray diffraction (XRD), where the samples were cut in two pieces, it is preferable to use the neutron diffraction
Summary
High local residual stresses existing in components could have vital influence on its properties. Global RS exist in the entire component and they are resulting from shrinkage processes which occur in the whole component [1] The local compressive RS, which arise in the weld zone as a consequence of the restrained volume expansion during the transformation of austenite in martensite, bainite or ferrite, are superimposed to the global tensile RS. To verify the results obtained by XRD, where the samples were cut in two pieces, it is preferable to use the neutron diffraction It has distinguished benefits such as the unique deep-penetration, threedimensional mapping capability, and volume-averaged bulk measurements characteristic of the scattering neutron beam for steel sample thickness up to 50 mm without cutting [4]
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