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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >The Effect of Rapid Heat Treatment on the High-Temperature Tensile Behavior of Superplastic Ti-6Al-4V
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The Effect of Rapid Heat Treatment on the High-Temperature Tensile Behavior of Superplastic Ti-6Al-4V

机译：快速热处理对超塑性Ti-6Al-4V高温拉伸行为的影响

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摘要

The effect of rapid heat treatment on the microstructure and elevated-temperature tensile behavior of a Ti-6Al-4V sheet has been studied. Nonequiaxed secondary alpha phase, introduced by rapid heat treatment, increased the flow stress and changed the stress-strain behavior. A finer scale of the microstructures produced by rapid heat treatment, however, resulted in a stress-strain behavior that differed from that reported in the microstructures obtained from a slower, furnace heat treatment. These fine structures exhibited higher values of m, greater elongation, and lower flow stresses. The stress-strain behavior was found to be dependent on the prior-beta grain size; this effect was not observed when the material was furnace heat treated in the beta-phase field. The stress-strain curve gradually changed from exhibiting continuous strain hardening to exhibiting a peak stress followed by strain softening, i.e., the superplastic behavior of the as received material gradually diminished as the prior-heat-treatment temperature increased.
机译：研究了快速热处理对Ti-6Al-4V薄板的显微组织和高温拉伸行为的影响。通过快速热处理引入的非等速二级α相增加了流动应力并改变了应力应变行为。然而，通过快速热处理产生的微观结构的更精细尺度导致应力-应变行为不同于通过较慢的炉子热处理获得的微观结构中报道的行为。这些精细的结构表现出更高的m值，更大的伸长率和更低的流动应力。发现应力-应变行为取决于先前的β晶粒尺寸。当在β相场中对该材料进行炉热处理时，未观察到这种效果。应力-应变曲线从显示出连续的应变硬化逐渐改变为显示出峰值应力，随后显示出应变软化，即，随着预热处理温度的升高，所接受材料的超塑性行为逐渐减弱。

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