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Acta Metall Sin  1994, Vol. 30 Issue (1): 29-34    DOI:
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MICROSTRUCTURAL EFFECT ON FATIGUE CRACK INITIATION FOR SHOT PEENED COPPER AND BRASS
XU Kewei;HU Naisai;HE Jiawen;(Xi'an Jiaotong University)(Manuscript received 3 August;1993;in revised form 22 October;1993)
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XU Kewei;HU Naisai;HE Jiawen;(Xi'an Jiaotong University)(Manuscript received 3 August;1993;in revised form 22 October;1993). MICROSTRUCTURAL EFFECT ON FATIGUE CRACK INITIATION FOR SHOT PEENED COPPER AND BRASS. Acta Metall Sin, 1994, 30(1): 29-34.

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Abstract  Effect of deformed structure by shot peening on retardation of fatigue crack initiation in Cu or brass has been investigated via separation from residual stress effect and under observation on surface slip band and microsubstructure.The structure of shot peened layer on specimen may retard the dislocation movement by slip outward from the core to surface,and limit the dislocation movement of deformed layer within the cellular dislocation of Cu or paling twins of brass.Thus,the fatigue damage of intrusion and extrusion type caused by the slip band on surface may be effectively reduced.Correspondent:XU Kewei,(professor,National Laboratory.for Mechanical Behaviour of Metallic Materials,Xi'an Jiaotong University,Xi'an,710049)
Key words:  shot peening      microstructure      residual stress      fatigue      copper      brass     
Received:  18 January 1994     
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