AUTHOR=Chen Shi-Wei , Huang E-Wen , Chiu Sung-Mao , Reid Mark , Wu Cheng-Yen , Paradowska Anna M. , Lam Tu-Ngoc , Wu Yu-Hao , Lee Soo Yeol , Lu Shao-Chien , Chen Shin-An , Lin Yan-Gu , Weng Shih-Chang 

TITLE=Diffraction-based Residual Stress Mapping of a Stress Frame of Gray Iron via Vibratory Stress Relief Method

JOURNAL=Frontiers in Materials

VOLUME=Volume 9 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2022.859342

DOI=10.3389/fmats.2022.859342

ISSN=2296-8016

ABSTRACT=The role of residual stress is critical, especially for machine tools demanding an accuracy below 1 µm. Because when minor stresses are subjected to a tiny area, the applied force can cause devastating distortions on the precision components at this length scale. In this research, we systematically investigated the residual stress in a stress frame of grey iron, used in machine tools, using synchrotron X-ray and neutron sources. Through the combination of these techniques, the residual stresses on the surface, inside the bulk, and in average were presented. Comprehensive analysis results shed light on the vibratory stress relief technique which reduced the residual stresses and stabilized them even  materials undergoing cycling heating. Although only tensile stresses and not compressive stresses are effectively reduced, this technique is useful in improving the mechanical stability of materials in machine tools.