The effects of thermal shocking on the residual stress in Si3N4 ceramic composites

Sahiner, A.; Wittmer, Dale E.; Sweeney, Marie L.

doi:10.1016/s0168-583x(97)00547-8

Cited by 7 publications

(1 citation statement)

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“…Martensitic steel deposited by plasma semi-transferred arc process on ferritic steel [20]: it has been shown a compressive tangential RS-component for the coating, with a steep gradient at the coating/substrate interface and a weak tensile component for the radial direction. XRD from synchrotron sources has been adopted for surface and interface RS assessment [21]: the spatial resolution, in any case, results low in correspondence of one main direction, since in this method the gauge volume is exceedingly elongated as a consequence of the low scattering angles. When it is not possible to assume a biaxial RS status, hence, complementary measurements by ND are suggested.…”

Section: Measurement Setup and Discussion Of Available Resultsmentioning

confidence: 99%

Residual Stresses Assessment in Coated Materials: Complementarity between Neutron and X-Ray Techniques

Rogante¹,

Mikula

Vrána³

2011

KEM

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The residual stress (RS) status induced in the substrate of coated materials by the coating process plays frequently a major role in lending the component’s characteristics. RS assessment can give, thus, a substantial contribution in justifying different cases of failure or else bad performance of coated components due to e.g. the coating delamination or to other occurrences which are not simply interpretable via the conventional mechanical tests or microstructure analyses. The adoption of both neutron diffraction (ND) and X-ray diffraction (XRD) techniques has revealed its usefulness in assessing the RS values in proximity of the coating interface area, respectively, without any layer removal or hole drilling at the extreme surface. In this paper, some real cases of RS determination in coated materials by using these techniques and exploiting their complementarity are described. ND, in particular, is very suitable for crucial applications, where a much different stress situation than that assessed by XRD could be present at some depth below the surface. The results achieved can yield trends adoptable in monitoring of the coating features.

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Section: Measurement Setup and Discussion Of Available Resultsmentioning

confidence: 99%