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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Mechanical Properties of Laser Solid Formed Ti-6Al-4V Alloy Under Dynamic Shear Loading
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Microstructure and Mechanical Properties of Laser Solid Formed Ti-6Al-4V Alloy Under Dynamic Shear Loading

机译：动态剪切载荷下激光固体形成Ti-6Al-4V合金的组织和力学性能

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摘要

To investigate the mechanical properties of the Ti-6Al-4V alloy fabricated by laser solid forming technology, both static and dynamic shear tests were conducted on hat-shaped specimens by a servohydraulic testing machine and an enhanced split Hopkinson pressure bar system, over a temperature range of 173-573 K. The microstructure of both the original and deformed specimens was characterized by optical microscopy and scanning electron microscopy. The results show that: (1) the anisotropy of shear properties is not significant regardless of the visible stratification and the prior-beta grains that grow epitaxially along the depositing direction; (2) the ultimate shear strength of this material is lower than that of those Ti-6Al-4V alloys fabricated by forging and extrusion; (3) the adiabatic shear bands of approximately 25.6-36.4 lm in width can develop at all selected temperatures during the dynamic shear deformation; and (4) the observed microstructure and measured microhardness indicate that the grains become refined in adiabatic shear band. Estimation of the temperature rise shows that the temperature in shear band exceeds the recrystallization temperature. The process of rotational dynamic recrystallization is considered to be the cause of the grain refinement in shear band.
机译：为了研究通过激光实体成型技术制造的Ti-6Al-4V合金的机械性能，通过伺服液试验机和增强的分裂霍普金森压杆系统在帽形标本上进行静态和动态剪切测试，在温度下173-573 K的范围。通过光学显微镜和扫描电子显微镜表征原始和变形样品的微观结构。结果表明：（1）无论可见分层和沿沉积方向外延生长的先前β颗粒，剪切性能的各向异性并不重要; （2）这种材料的极性剪切强度低于通过锻造和挤出制造的那些Ti-6Al-4V合金的强度; （3）在动态剪切变形期间的所有选定温度下，宽度约为25.6-36.4升的绝热剪切带可以在所有选定的温度下显影; （4）观察到的微观结构和测量的微硬度表明晶粒在绝热剪切带中被精制。估计温度升高表明剪切带中的温度超过再结晶温度。旋转动态再结晶过程被认为是剪切带中晶粒细化的原因。

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