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EFFECT OF MICROSTRUCTURE ON FATIGUE CRACK INITIATION OF SHOT PEENED COPPER AND BRASS

EFFECT OF MICROSTRUCTURE ON FATIGUE CRACK INITIATION OF SHOT PEENED COPPER AND BRASS
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摘要 The effect of microstructure on fatigue crack initiation was considered in the shot peened surface layer by eliminating the influence of compressive residual stress. Results indicate that the drastically deformed structure by shot peening would keep the dislocations from moving out of the surface and hold the dislocations inside the cell structure of copper or the palling structure of brass. The fatigue damage of intrusion and extrusion type could thus be depressed and the fatigue life is enhanced. The effect of microstructure on fatigue crack initiation was considered in the shot peened surface layer by eliminating the influence of compressive residual stress. Results indicate that the drastically deformed structure by shot peening would keep the dislocations from moving out of the surface and hold the dislocations inside the cell structure of copper or the palling structure of brass. The fatigue damage of intrusion and extrusion type could thus be depressed and the fatigue life is enhanced.
出处 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1996年第6期607-611,共5页 金属学报(英文版)
关键词 shot peening fatigue microstructure shot peening, fatigue,microstructure
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