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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Prior #beta#-Grain Size on the Hot Deformation Behavior of Ti-6A1-4V: Coarse vs Coarser
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Effect of Prior #beta#-Grain Size on the Hot Deformation Behavior of Ti-6A1-4V: Coarse vs Coarser

机译：先前的＃beta＃晶粒尺寸对Ti-6A1-4V热变形行为的影响：粗与粗

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摘要

The hot deformation behavior of extra low interstitial (ELI) grade Ti-6Al-4V with a transformed, #beta#-preform microstructure was studied in coarse (0.5 to 1 mm) and coarser (2 to 3 mm) (prior, #beta#) grained materials using hot compression testing in the temperature range of 750 to 1100 deg C and a strain rate range of 0.001 to 100 s~(-1) Processing maps were developed on the basis of the flow stress data as a function of temperature and strain rate. The maps revealed that the domain of globularization of the lamellar structure and region of large grained superplasticity of #beta# were not influenced by the prior #beta#-grain size. However, the regimes of cracking at the prior #beta#-grain boundaries occurring at lower temperatures and strain rates and the flow instability occurring at lower temperatures and higher strain rates were both wider for the coarse grained material than the coarser grained material. The #beta#- instability regime, however, was more pronounced in the coarser grained material. From the hot workability viewpoint, the present results show that there is no remarkable benefit in refining the prior #beta#-grain size. On the contrary, it will somewhat restrict the workability domain by widening the adjacent regimes, causing microstructural damage.
机译：研究了具有转化的＃beta＃型预成型坯组织的极低间隙（ELI）级Ti-6Al-4V的热变形行为，其粗加工（0.5至1 mm）和较粗加工（2至3 mm）（先前为#beta） ＃）在750至1100℃的温度范围内以及0.001至100 s〜（-1）的应变速率范围内使用热压缩测试的粒状材料，根据流动应力数据随温度变化绘制了加工图和应变率。这些图揭示了＃beta＃的层状结构的球状化区域和大颗粒超塑性区域不受先前＃beta＃晶粒尺寸的影响。然而，对于粗粒材料而言，在较早的β-β-晶界处的开裂状态在较低的温度和应变速率下发生，并且在较低的温度和较高的应变速率下发生的流动不稳定性均较粗粒材料宽。但是，＃β＃-不稳定性在较粗的颗粒材料中更为明显。从热加工性的观点来看，目前的结果表明，细化先前的＃beta＃晶粒尺寸没有明显的好处。相反，它会通过扩大相邻的范围而在一定程度上限制可加工性范围，从而引起微观结构破坏。

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