Hill Engineering recently attended the 2018 Thermal Processing in Motion Conference in Spartanburg, South Carolina. This conference brings together international experts from around the globe to present the latest innovations and research in thermal processing including: additive manufacturing; phase transformations; microstructure/property relationships; quenching and quenchants; thermomechanical thermal processing; and surface hardening. The second day of the conference included a Residual Stress Workshop.
The goal of the Residual Stress Workshop was to review the current state-of-the-art in residual stress measurement, prediction, control and incorporation into product design. The Residual Stress Workshop collected information on current gaps relative to designing products and establishing product definitions that include bulk residual stress as a component attribute. Concepts for possible industry standards were proposed to support enhanced product capabilities.
Material fabrication processes like forging, rolling, extrusion, quenching, additive manufacturing, machining, and welding lock spatially varying residual stress fields into structural materials. These residual stresses can influence the way that materials perform (e.g., fatigue, fracture, distortion, and corrosion). Hill Engineering has developed expertise to support many different types of residual stress analysis, which we discussed during the workshop. The notes from the workshop will be organized by the committee and published in an upcoming technical publication.
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Illustration of measured residual stress in a linear friction weld specimen using the contour method