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EFFECT OF SUBSTRUCTURE AND RESIDUAL STRESS IN STRENGTHENED LAYER ON FATIGUE STRENGTH OF STAINLESS OR LOW CARBON STEEL

TAN Yuxu REN Liping LI Gang Xi'an Jiaotong University , Xi'an , China TAN Yuxu Associate Professor , Institute of Metallic Materials and Strength , Xi'an Jiaotong University , Xi'an 710048 , China

金属学报(英文版)

In the strengthened layer of stainless steel after shot peening,there are a great amount of deformation microtwins which may act as structural strengthening factor and prevent the gradual relaxation of surface residual stress during fatigue,so as to keep its rather high level of bending fatigue strength.However,in the strengthened surface layer of low carbon steel, dislocation cell structure is so unstalbe during fatigue that its surface residual stress relaxation cannot be retarded.Therefore,the bending fatigue strength of the low carbon steel can not be improred by shot peening.

关键词: substructure , null , null

SHOT-PEENING STRENGTHENED LAYER AND ITS EFFECT ON FATIGUE STRENGTH OF α-BRASS

TAN Yuxu REN Liping LI Gang Xi'an Jiaotong University , Xi'an , China Institute of Metallic and Strength , Xi'an Jiaotong University , Xi'an , China

金属学报(英文版)

In shot peened α-brass surface layer{111} type planar defects and deformation microtwins have been observed by means of TEM analysis.The density of microtwins deereases with the increase of layer depth.The enhancement of fatigue strength and the unrelaxation of residual stress after shot peening are concerned in the substructures of strengthened layer.

关键词: residual stress , null , null , null

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