Investigation for Different Peening Techniques on Residual Stress Field of SiC_w/Al Composite

摘要

In order to improve the residual stress field of SiC_w/Al composite after conventional shot peening, modified warm peening, stress peening, and compound peening were carried out on SiC_w/Al composite specimens and residual stress fields of those specimens were investigated via x-ray measurement. Results show conventional peening can improve residual stress field of SiC_w/Al composite but the improvement has a limit. Compared with conventional peening, modified warm peening can increase the maximum residual stress, the depth of compressive residual stress layer and improve stability of residual stress field whereas stress peening can increase all characteristic parameters of residual stress field efficiently. Compound peening combines the positive effects of modified warm peening and stress peening, and has the most strengthening effects.