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首页> 外文期刊>Metallurgical and Materials Transactions A >Elevated-Temperature Mechanical Behavior of As-Cast and Wrought Ti-6Al-4V-1B
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Elevated-Temperature Mechanical Behavior of As-Cast and Wrought Ti-6Al-4V-1B

机译：铸态和锻制Ti-6Al-4V-1B的高温力学行为

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摘要

This work studied the effect of processing on the elevated-temperature [728 K (455 °C)] fatigue deformation behavior of Ti-6Al-4V-1B for maximum applied stresses between 300 to 700 MPa (R = 0.1, 5 Hz). The alloy was evaluated in the as-cast form as well as in three wrought forms: cast-and-extruded, powder metallurgy (PM) rolled, and PM extruded. Processing caused significant differences in the microstructure, which in turn impacted the fatigue properties. The PM-extruded material exhibited a fine equiaxed α + β microstructure and the greatest fatigue resistance among all the studied materials. The β-phase field extrusion followed by cooling resulted in a strong α-phase texture in which the basal plane was predominately oriented perpendicular to the extrusion axis. The TiB whiskers were also aligned in the extrusion direction. The α-phase texture in the extrusions resulted in tensile-strength anisotropy. The tensile strength in the transverse orientation was lower than that in the longitudinal orientation, but the strength in the transverse orientation remained greater than that for the as-cast Ti-6Al-4V. The ratcheting behavior during fatigue is also discussed.
机译：这项工作研究了在300到700 MPa（R = 0.1，5 Hz）之间最大施加应力下，Ti-6Al-4V-1B的高温[728 K（455°C）]疲劳变形行为的影响。以铸态形式和三种锻造形式对合金进行了评估：铸造和挤压，粉末冶金（PM）轧制和PM挤压。加工引起微观结构的显着差异，进而影响疲劳性能。在所有研究材料中，PM挤出材料均表现出良好的等轴α+β微观结构，并具有最大的抗疲劳性。 β相场挤压随后冷却产生了很强的α相织构，其中基面主要垂直于挤压轴取向。 TiB晶须也在挤出方向上对齐。挤压中的α相织构导致拉伸强度各向异性。横向取向的抗拉强度低于纵向取向的抗拉强度，但是横向取向的抗拉强度仍然大于铸态的Ti-6Al-4V。还讨论了疲劳期间的棘轮行为。

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