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深冷处理对TC4钛合金微观组织演变及力学性能的影响

The Influence of Deep Cryogenic Treatment (DCT) on the Microstructure Evolution and Mechanical Properties of TC4 Titanium Alloy.

作者信息

Lan Xuzhi, Xu Yulang, Li Jingyong, Gong Yifeng, Shi Mingxiao

机构信息

Advanced Welding Technology Provincial Key Laboratory, Jiangsu University of Science and Technology, Zhenjiang 212003, China.

School of Naval Architecture & Intelligent Manufacturing, Jiangsu Maritime Institute, Nanjing 211199, China.

出版信息

Materials (Basel). 2024 Sep 19;17(18):4603. doi: 10.3390/ma17184603.

DOI:10.3390/ma17184603
PMID:39336344
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11433462/
Abstract

Deep cryogenic treatment (-196 °C, DCT) is an emerging application that can make significant changes to many materials. In this study, DCT was applied to Ti6Al4V (TC4) titanium alloy, and we delved into an examination of the impact on its microstructural morphologies and mechanical properties. It was observed that DCT has a significant effect on the grain refinement of the TC4 titanium alloy base material. Obvious grain refinement behavior can be observed with 6 h of DCT, and the phenomenon of grain refinement becomes more pronounced with extension of the DCT time. In addition, DCT promotes the transformation of the β phase into the α' phase in the TC4 titanium alloy base material. XRD analysis further confirmed that DCT leads to the transformation of the β phase into the α' phase. The element vanadium was detected by scanning electron microscopy, and it was found that the β phase inside the base material had transformed into the α' phase. It was observed that DCT has a positive influence on the hardness of the TC4 titanium alloy base material. The hardness of the sample treated with 18 h of DCT increased from 331.2 HV to 362.5 HV, presenting a 9.5% increase compared to the sample without DCT. Furthermore, it was proven that DCT had little effect on the tensile strength but a significant impact on the plasticity and toughness of the base material. In particular, the elongation and impact toughness of the sample subject to 18 h of DCT represented enhancements of 27.33% and 8.09%, respectively, compared to the raw material without DCT.

摘要

深冷处理（-196°C，DCT）是一种新兴应用，可对许多材料产生重大变化。在本研究中，对Ti6Al4V（TC4）钛合金进行了深冷处理，我们深入研究了其对微观结构形态和力学性能的影响。观察到深冷处理对TC4钛合金母材的晶粒细化有显著影响。深冷处理6小时可观察到明显的晶粒细化行为，随着深冷处理时间的延长，晶粒细化现象变得更加明显。此外，深冷处理促进了TC4钛合金母材中β相向α'相的转变。XRD分析进一步证实深冷处理导致β相转变为α'相。通过扫描电子显微镜检测到元素钒，发现母材内部的β相已转变为α'相。观察到深冷处理对TC4钛合金母材的硬度有积极影响。经过18小时深冷处理的样品硬度从331.2 HV增加到362.5 HV，与未进行深冷处理的样品相比提高了9.5%。此外，已证明深冷处理对拉伸强度影响不大，但对母材的塑性和韧性有显著影响。特别是，经过18小时深冷处理的样品的伸长率和冲击韧性分别比未进行深冷处理的原材料提高了27.33%和8.09%。

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