挤压强化对TC17钛合金孔结构疲劳寿命的影响
发布时间:2018-11-19 08:06
【摘要】:为提高TC17中心孔试样的疲劳性能,采用扫描电镜、粗糙度仪、X射线衍射仪等对孔壁表面完整性进行分析,研究孔挤压强化工艺对试样疲劳性能的影响。结果表明:过盈量为0.18 mm的孔挤压试样最小疲劳寿命(14718次)高于原始试样的最大疲劳寿命(13965次);同过盈量为0.28 mm和0.38 mm的试样相比,其疲劳寿命分散性较小、无明显的应力集中现象,具有良好的疲劳寿命增益效果;孔壁表面粗糙度值最低;孔壁内侧形成一定深度的强化层;孔边产生的残余压应力场有效地抑制了孔壁内表面疲劳裂纹的产生,有利于提高孔结构的疲劳性能。
[Abstract]:In order to improve the fatigue properties of TC17 central pore specimen, the surface integrity of the pore wall was analyzed by scanning electron microscope, roughness instrument and X-ray diffractometer, and the effect of hole extrusion strengthening process on the fatigue properties of the specimen was studied. The results show that the minimum fatigue life (14718 times) of the sample with interference of 0.18 mm is higher than that of the original specimen (13965 times). Compared with the samples with interference ratio of 0. 28 mm and 0. 38 mm, the fatigue life of the samples has less dispersibility, no obvious stress concentration, good fatigue life gain effect, and the lowest surface roughness value. A certain depth of strengthening layer is formed inside the hole wall, and the residual compressive stress field produced by the hole edge effectively inhibits the formation of fatigue cracks on the inner surface of the hole wall, which is conducive to improving the fatigue performance of the pore structure.
【作者单位】: 中国航发北京航空材料研究院;中国航发北京航空材料研究院航空材料先进腐蚀与防护航空科技重点实验室;
【分类号】:TG146.23;TG379
[Abstract]:In order to improve the fatigue properties of TC17 central pore specimen, the surface integrity of the pore wall was analyzed by scanning electron microscope, roughness instrument and X-ray diffractometer, and the effect of hole extrusion strengthening process on the fatigue properties of the specimen was studied. The results show that the minimum fatigue life (14718 times) of the sample with interference of 0.18 mm is higher than that of the original specimen (13965 times). Compared with the samples with interference ratio of 0. 28 mm and 0. 38 mm, the fatigue life of the samples has less dispersibility, no obvious stress concentration, good fatigue life gain effect, and the lowest surface roughness value. A certain depth of strengthening layer is formed inside the hole wall, and the residual compressive stress field produced by the hole edge effectively inhibits the formation of fatigue cracks on the inner surface of the hole wall, which is conducive to improving the fatigue performance of the pore structure.
【作者单位】: 中国航发北京航空材料研究院;中国航发北京航空材料研究院航空材料先进腐蚀与防护航空科技重点实验室;
【分类号】:TG146.23;TG379
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