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首页> 外文会议>STP 1471; Symposium on Titanium, Niobium, Zirconium, and Tantalum for Medical and Surgical Applications; 20051109-10; Washington,DC(US) >Comparison of the Corrosion Fatigue Characteristics of CP Ti-Grade 4, Ti-6AI-4V ELI, Ti-6AI-7Nb, and Ti-15Mo
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Comparison of the Corrosion Fatigue Characteristics of CP Ti-Grade 4, Ti-6AI-4V ELI, Ti-6AI-7Nb, and Ti-15Mo

机译：CP Ti 4级，Ti-6AI-4V ELI，Ti-6AI-7Nb和Ti-15Mo的腐蚀疲劳特性比较

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The purpose of this study was to evaluate and compare the corrosion fatigue (CF) characteristics of a series of titanium alloys including Grade 4 CP Ti (ASTM F 67), Ti-6Al-4V (ASTM F 136), Ti-6Al-7Nb (ASTM F 1295), and Ti-15 Mo (ASTM F 2066). Evaluation of alloy composition, microstructure, and Vicker's microhardness was performed to ensure that each material met the required specification. Smooth and notched CF tensile samples of each alloy were machined using low stress grind techniques and tested at 1Hz according to ASTM F 1801 in both Ringer's solution and distilled/de-ionized water at 37℃. Smooth CF samples had a 10 mm gauge length and a 2.5 mm gauge diameter, and notched CF samples had a 2.5 mm notch root diameter (K_t=3.2). A minimum of three samples was tested at five tension-tension sinusoidal load levels including a run-out level at 10~6 cycles. SEM analysis was performed on the fractured surfaces of representative samples of each alloy to characterize and compare the failure mechanisms. Fatigue results revealed no differences between the smooth and notched samples of each alloy run in distilled water and those run in Ringer's solution. Results indicated corrosion fatigue mechanisms were not contributing to the fractures under these conditions. However, a significant reduction of fatigue strength was observed for the notched samples of each alloy compared to the smooth samples in identical solutions. These results suggest that even though there is no notch sensitivity in these alloys under static conditions, a notch under dynamic fatigue mechanisms may cause a substantial reduction in cycles to implant fracture. SEM analysis showed typical fatigue fracture morphologies on both the smooth and notched samples. Notch samples, however, did show more defined fluting in terracing due to the higher tri-axial stress state at the root of the notch. In conclusion, corrosion fatigue mechanisms were not contributing to the fracture of these alloys under the given conditions, but the presence of a notch significantly reduced the fatigue strength of all alloys tested.
机译：本研究的目的是评估和比较一系列钛合金的腐蚀疲劳（CF）特性，包括4级CP Ti（ASTM F 67），Ti-6Al-4V（ASTM F 136），Ti-6Al-7Nb （ASTM F 1295）和Ti-15 Mo（ASTM F 2066）。进行合金成分，微观结构和维氏显微硬度的评估，以确保每种材料均符合要求的规格。使用低应力研磨技术加工每种合金的光滑且有缺口的CF拉伸样品，并根据ASTM F 1801在1赫林氏溶液和37℃的蒸馏水/去离子水中均按照1Hz进行测试。光滑的CF样品的标距长度为10毫米，直径为2.5毫米，带槽的CF样品的切口根部直径为2.5毫米（K_t = 3.2）。在五个拉伸-拉伸正弦曲线载荷水平（包括10〜6个循环的跳动水平）下测试至少三个样本。在每种合金的代表性样品的断裂表面上进行SEM分析，以表征和比较破坏机理。疲劳结果表明，在蒸馏水中运行的每种合金的光滑和缺口样品与在林格氏溶液中运行的合金的光滑和缺口样品之间没有差异。结果表明，在这些条件下，腐蚀疲劳机理对断裂没有贡献。但是，与相同溶液中的光滑样品相比，每种合金的缺口样品的疲劳强度均明显降低。这些结果表明，即使这些合金在静态条件下不存在缺口敏感性，但在动态疲劳机制下的缺口可能会导致植入物断裂的周期大大减少。 SEM分析显示，光滑样品和缺口样品均具有典型的疲劳断裂形态。但是，由于在槽口根部较高的三轴应力状态，槽口样品确实在梯田中显示出更清晰的凹槽。总之，在给定的条件下，腐蚀疲劳机理并没有助长这些合金的断裂，但是缺口的存在显着降低了所有测试合金的疲劳强度。

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