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为了研究喷丸强化处理对ZK60镁合金疲劳性能的影响,采用气动式喷丸机对ZK60高强度镁合金试样进行喷丸强化,利用X射线衍射技术对喷丸处理试样表面进行残余应力测试分析,并利用扫描电镜分析了镁合金试样表面晶粒尺寸变化,对所有试样进行疲劳性能测试,分析喷丸强化对ZK60镁合金疲劳性能的影响,同时对疲劳断口进行扫描分析。实验结果表明:喷丸强化在ZK60镁合金试样表面产生了一定的残余压应力分布,且残余压应力最大值可达-198 MPa,同时,喷丸强化可使ZK60镁合金试样表面粗糙度减小,喷丸区域晶粒得到明显细化,喷丸强化使得试样表面完整性得到极大改善,从而提高了ZK60镁合金材料的疲劳性能,喷丸试样疲劳寿命相对于未处理试样最大提高了36%,疲劳裂纹源由试样表面转移到喷丸强化层以内,从而抑制了疲劳裂纹的萌生。
In order to study the effect of shot peening on the fatigue properties of ZK60 magnesium alloy, shot peening of ZK60 high-strength magnesium alloy was carried out by pneumatic shot peening. The surface residual stress of shot peening was tested by X-ray diffraction The changes of grain size on the surface of magnesium alloy were analyzed by scanning electron microscope. The fatigue properties of all the samples were tested. The effect of shot peening on the fatigue properties of ZK60 magnesium alloy was analyzed. At the same time, the fatigue fracture was analyzed by scanning. The experimental results show that the shot peening produces a certain residual compressive stress distribution on the surface of ZK60 magnesium alloy specimen and the maximum residual compressive stress can reach -198 MPa. Meanwhile, the shot peening can make the surface roughness of ZK60 magnesium alloy specimen Reduce the shot peening region grain was significantly refined, shot peening makes the sample surface integrity has been greatly improved, thereby improving the fatigue properties of ZK60 magnesium alloy material, shot peening fatigue life of the sample relative to the untreated sample The maximum increase of 36%, the source of fatigue cracks transferred from the surface of the specimen to the shot peening within the layer, thereby inhibiting the initiation of fatigue cracks.