Ti-6Al-4V合金の疲労強度に及ぼすショットピーニングの影響
Ti-6Al-4V合金の疲労強度に及ぼすショットピーニングの影響
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DOI：
10.2472/jsms.43.666
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发表时间：
1994-06
期刊：
影响因子：
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通讯作者：
良雄 橘内;正清 田中;悦二 吉久
中科院分区：
文献类型：
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作者：
良雄 橘内;正清 田中;悦二 吉久
结合残余应力和显微组织，研究了喷丸处理对Ti-6Al-4V合金轴向疲劳性能的影响。制备了应力集中系数为1.63的双边缺口平板试件。通过喷丸处理，在约70μm深度的表层引入了残余压应力，最大值为600 MPa。疲劳试验在R=0.05的条件下进行。喷丸处理后的疲劳强度约为未喷丸处理的1.3倍。喷丸后疲劳裂纹的起裂位置在试件表面以下约150~180μm处。然而，在未经喷丸处理的试件中，在缺口根部试件表面的α相组织内发生了疲劳裂纹。喷丸后疲劳强度的提高可能是由于起始点从表面向亚表面转移所致。用X射线衍射法测定喷丸处理后的表面残余应力在循环加载过程中略有下降。
The effects of shot peening on the axial fatigue properties of Ti-6Al-4V were examined in connection with residual stress and microstructure. Double edge notched plate specimens with the stress concentration factor 1.63 were prepared. By shot peening, compressive residual stress was introduced into the surface layer of approximately 70μm in depth, which showed the maximum value of 600MPa. Fatigue tests were carried out at R=0.05. The fatigue strength of the shot peened specimens increased by about 1.3 times that of the unpeening specimens. The fatigue crack initiaion site in the shot peened specimens was at about 150 to 180μm below the specimen surface. In the unpeened specimens, however, a fatigue crack was initiated within α phase microstructure at the specimen surface of the notch root. The increase of fatigue strength in the shot peened specimens might be due to a shift of the initiation site from the surface to the subsurface. The surface residual stress in the shot peened specimen measured by an X-ray diffraction method slightly decreased during cyclic loading.