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首页> 外文期刊>Arabian Journal for Science and Engineering >The Effect of Microstructural Features and Thickness on Fracture Toughness of Ti–6Al–4V ELI Thin Sheets
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The Effect of Microstructural Features and Thickness on Fracture Toughness of Ti–6Al–4V ELI Thin Sheets

机译：Ti-6Al-4V ELI薄板的显微组织特征和厚度对断裂韧性的影响

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摘要

Thin plates made of Ti-6Al-4V ELI alloy are extremely useful and applicable material of implants industries. The present research is focused on the fracture toughness of Ti-6Al-4V ELI thin sheets through the mechanical and microstructural analyses. The load displacement curves resulted from tear testing methodologies in addition to tensile test were provided for both lamellar and equiaxed microstructures with three different thicknesses. Unit initiation and propagation energies, as an indication of fracture toughness, associated with tear strength were calculated from the curves. Furthermore, the influence of heat treatment's soaking time for equiaxed microstructure and cooling rate for lamellar microstructure on tear testing, unit initiation and propagation energies was studied. In respect of the equiaxed microstructure, grain growth evolved from the extended soaking time was resulted in destructive effect on crack initiation resistance with increasing thickness, though it marginally affected the crack propagation resistance and fracture toughness. Regarding the lamellar microstructure, thinning the lamellas encouraged crack initiation and propagation resistance for thin sections. However, crack propagation resistance was reduced for thicker sections which contrasts with increasing crack initiation resistance by rising sample thickness. On overall view, increasing sample thickness associated with reducing the grain size was beneficial for crack resistance in equiaxed microstructure. In respect of the lamellar microstructures, thin lamellae particularly in thin sections was superior in terms of crack resistance.
机译：Ti-6Al-4V ELI合金制成的薄板是植入物行业非常有用且适用的材料。目前的研究集中在通过力学和微观结构分析来研究Ti-6Al-4V ELI薄板的断裂韧性。对于三种不同厚度的层状和等轴微结构，还提供了由撕裂测试方法以及拉伸测试得出的载荷位移曲线。从曲线计算出与断裂强度相关的断裂强度的单位起始能量和传播能量。此外，研究了热处理时间对等轴组织的浸润时间和层状组织的冷却速率对撕裂试验，单元引发和传播能的影响。就等轴组织而言，随时间的延长，晶粒的长大是由于保温时间的延长而引起的，尽管它对裂纹扩展阻力和断裂韧性有一定的影响，但随着厚度的增加，其对裂纹萌生阻力的破坏作用也随之增大。关于薄层的微观结构，薄薄的薄层促进了薄截面的裂纹萌生和扩展阻力。但是，对于较厚的部分，抗裂纹扩展性降低，这与通过增加样品厚度而增加的抗裂纹引发性相反。从总体上看，增加与减小晶粒尺寸相关的样品厚度有利于等轴微结构的抗裂性。就层状微结构而言，薄层尤其是在薄截面中的层在抗裂性方面是优异的。

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