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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Cryogenic Treatment on Microstructure and Mechanical Properties of Ti6Al4V Alloy
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Influence of Cryogenic Treatment on Microstructure and Mechanical Properties of Ti6Al4V Alloy

机译：低温处理对Ti6Al4V合金微观结构和力学性能的影响

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摘要

Cryogenic treatment is an emerging application that can make significant changes in many materials. In this study, shallow (- 80 degrees C) and deep (- 196 degrees C) cryogenic treatment was applied to Ti6Al4V alloy. Additionally, aging treatment and supplementary deep cryogenic treatment were also performed. Tensile tests were done to observe the effects of cryogenic treatment on the mechanical properties and formability of Ti6Al4 alloy. According to the results of these tests, it was observed that the cryogenic treatment had a positive influence on the plasticity properties of Ti6Al4V alloy. For the 24-h and 36-h deep cryo-treated samples, the uniform plastic deformation region (UPDR) was extended 5 and 8.3% compared to untreated sample, respectively. However, this improvement in plasticity observed in samples treated with cryogenic treatment for 36 h led to a decrease in yield strength by 2%. Microstructural and XRD analysis was performed to characterize the microstructural changes that happened with the effect of applied heat treatments. The characterization study shows that with the application of cryogenic treatment internal structure of the material changed, the beta phase ratio of the alloy decreased from 8.1 to 5.6% with 36-h deep cryogenic treatment. The unstable beta phase was transformed into alpha phase and stable beta phase. The experimental study shows that cryogenic treatment improves the plasticity and toughness of Ti6Al4V alloy at room temperature and regulates the microstructure and reduces the residual stress.
机译：低温处理是一种新兴的应用，它可以使许多材料发生重大变化。在本研究中，对Ti6Al4V合金进行了浅（-80℃）和深（-196℃）深冷处理。此外，还进行了时效处理和补充深冷处理。通过拉伸试验，观察了深冷处理对Ti6Al4合金力学性能和成形性的影响。根据这些试验结果，观察到低温处理对Ti6Al4V合金的塑性性能有积极影响。对于24小时和36小时深低温处理的样品，与未处理样品相比，均匀塑性变形区（UPDR）分别延长了5%和8.3%。然而，在深冷处理36小时的样品中观察到的塑性改善导致屈服强度降低2%。进行微观结构和XRD分析，以表征在应用热处理的影响下发生的微观结构变化。表征研究表明，随着深冷处理的应用，材料的内部结构发生了变化，深冷处理36小时后，合金的β相比率从8.1%降至5.6%。不稳定的β相转变为α相和稳定的β相。实验研究表明，深冷处理提高了Ti6Al4V合金的室温塑性和韧性，调节了组织，降低了残余应力。

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