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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 Stress Corrosion Cracking Characteristics of CP Ti, Ti-6Al-7Nb, Ti-6Al-4V, and Ti-15Mo
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Comparison of Stress Corrosion Cracking Characteristics of CP Ti, Ti-6Al-7Nb, Ti-6Al-4V, and Ti-15Mo

机译：CP Ti，Ti-6Al-7Nb，Ti-6Al-4V和Ti-15Mo的应力腐蚀开裂特性比较

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The purpose of this research was to evaluate and compare the stress corrosion cracking (SCC) of Ti-15 Mo (ASTM F2066), Ti-6Al-7Nb (ASTM1295), Ti-6Al-4V ELI (ASTM F136), and Grade 4 CPTi (ASTM F67). Evaluation of alloy composition, microstructure, Vickers microhardness, and tensile properties was performed to determine compliance with the appropriate ASTM specification. For SCC testing, smooth tensile samples with a gauge length of 10 mm and a gauge diameter of 4 mm and notched samples with a notch root diameter of 4 mm (K_t=3.2) were prepared using low stress grinding procedures. Three smooth and three notched samples were tested in distilled H_2O and Ringer's solution at 37℃. Testing was performed using the slow extension rate method at a stroke rate of 10~(-5) mm/s according to the guidelines established in ASTM G129. The ratio of the percent elongation (PER) and reduction of area (ROAR) of smooth and notched samples tested in Ringer's solution and distilled water were evaluated. The fracture surfaces of representative samples were also examined for fracture mode identification using SEM. Results showed that all alloys complied with the appropriate ASTM specification. SCC may be considered to occur in a material if the ductile properties in an aggressive media are inferior to the ductile properties in a non-aggressive media. Evaluations of the PER and ROAR ratios in smooth and notched samples for each alloy in Ringer's and distilled water showed no indication of SCC failure mechanisms. SEM examination of the fracture surfaces showed no differences in the fracture morphology regardless of the testing solution. These results were consistent with the mechanical testing data. It is therefore concluded that SCC mechanisms were not operating or contributing to the fracture of these alloys under the conditions evaluated.
机译：这项研究的目的是评估和比较Ti-15 Mo（ASTM F2066），Ti-6Al-7Nb（ASTM1295），Ti-6Al-4V ELI（ASTM F136）和4级的应力腐蚀开裂（SCC） CPTi（ASTM F67）。进行合金成分，显微组织，维氏显微硬度和拉伸性能的评估，以确定是否符合适当的ASTM规范。对于SCC测试，使用低应力磨削程序制备了标距长度为10 mm，标距直径为4 mm的光滑拉伸样品和刻槽根直径为4 mm（K_t = 3.2）的刻槽样品。在蒸馏水H_2O和林格氏溶液中于37℃测试了三个光滑且有缺口的样品。根据美国材料试验学会（ASTM）G129中建立的指南，使用慢速延伸速率方法以10〜（-5）mm / s的冲程速率进行测试。评估了在林格氏溶液和蒸馏水中测试的光滑和缺口样品的伸长率（PER）和面积减少率（ROAR）的比率。还使用SEM检查代表性样品的断裂表面以鉴定断裂模式。结果表明，所有合金均符合适当的ASTM规范。如果在侵蚀性介质中的延展性低于在非侵蚀性介质中的延展性，则可以认为SCC发生在材料中。在林格氏液和蒸馏水中对每种合金的光滑和缺口样品中的PER和ROAR比率进行评估均未显示出SCC破坏机理。不论测试溶液如何，断裂表面的SEM检查都没有显示出断裂形态的差异。这些结果与机械测试数据一致。因此得出的结论是，在所评估的条件下，SCC机理没有起作用或没有导致这些合金的断裂。

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