α黄铜经表面喷丸强化后,平板弯曲疲劳强度可从90 MPa提高到130 MPa。在疲劳强度应力或高于疲劳强度应力(150MPa)的作用下,表层残余压应力不发生衰减。用透射电镜逐层观察分析强化层内的组织结构,可看到喷丸强化层内出现显微变形孪晶和面缺陷,孪晶的密度随层深加大而下降。喷丸强化后,α黄铜疲劳强度的增高和残余应力不发生松弛都与强化层内的组织结构有关。
In shot peened α-brass surface layer {111} type planar defects anddeformation microtwins have been observed by means of TEM analysis. Thedensity of microtwins decreases with the increase of layer depth. The enhancementof fatigue strength and the unrelaxation of residual stress after shot peening areconcerned in the substructures of strengthened layer.
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