High Cycle Fatigue Properties of Multi-Directionally Forged Commercial Purity Grade 2 Ti Plate
High Cycle Fatigue Properties of Multi-Directionally Forged Commercial Purity Grade 2 Ti Plate
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DOI：
10.4028/www.scientific.net/msf.916.166
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
Ilhamdi;T. Kakiuchi;H. Miura;Y. Uematsu
中科院分区：
文献类型：
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作者：
Ilhamdi;T. Kakiuchi;H. Miura;Y. Uematsu
采用多向锻造（MDFing）法制备超细晶纯钛（Ti）板，进行了拉伸疲劳试验。针对种植体的应用，研制了厚度为1mm的MDFed纯钛板。MDFed纯钛板的疲劳性能优于常规轧制纯钛板。MDFed板的高疲劳强度可归因于MDFing产生的更细的晶粒。当循环次数小于106次时，疲劳裂纹从试样表面开始萌生。然而，在高周疲劳区，MDFed纯钛板虽然厚度较薄，但仍能识别出具有典型鱼眼特征的次表面裂纹起裂。断口分析表明，鱼眼中心不存在夹杂物。亚表面裂纹的起裂机制可能与组织的不均匀性有关，在板材内部存在一些粗大的晶粒。
Tension-tension fatigue tests were conducted using ultrafine-grained commercially pure Titanium (Ti) plates fabricated by multi-directional forging (MDFing). The MDFed pure Ti plates with the thickness of 1 mm were developed aiming at dental implant application. The fatigue properties of MDFed pure Ti plates were superior to those of the conventional rolled pure Ti plates. The higher fatigue strengths in MDFed plates could be attributed to the much finer grains evolved by MDFing. Fatigue crack initiated from specimen surface, when number of cycles to failure was shorter than 106 cycles. In the high cycle fatigue (HCF) region, however, subsurface crack initiation with typical fish-eye feature was recognized in the MDFed pure Ti plate in spite of the thin thickness. Fractographic analyses revealed that no inclusion existed at the center of fish-eye. The subsurface crack initiation mechanism could be related to the inhomogeneity of microstructure with some coarse grains in the inner part of the plate.