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基于微观结构的激光熔覆Ti-6.5Al-3.5Mo-1.5Zr-0.3Si合金疲劳行为与断裂机制研究

Study on Fatigue Behavior and Fracture Mechanism of LMD Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy Based on Microstructure.

作者信息

Wu Yuxue, Wang Yongxin, Lu Yunmei, Zhao Chenxi

机构信息

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127, Youyi Road (West), Xi'an 710072, China.

出版信息

Materials (Basel). 2024 Dec 13;17(24):6112. doi: 10.3390/ma17246112.

DOI:10.3390/ma17246112
PMID:39769712
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11677222/
Abstract

This study explores the fatigue behavior and fracture mechanisms of TC11 titanium alloy formed by laser metal deposition (LMD) and subjected to double annealing. The research focuses on how the alloy's unique microstructure, consisting of alternating equiaxed and columnar crystals, influences its fatigue performance. The microstructure's basket-like α' phase, made up of both plate-shaped and needle-like structures, leads to variations in crack growth behavior, as shown in the relationship between the crack growth rate and the stress intensity. An analysis of slip patterns reveals that equiaxed crystals undergo more frequent deformation, accelerating crack propagation compared to the more evenly distributed deformation in columnar crystals. These findings suggest a new approach for improving the fatigue resistance of 3D-printed titanium alloys by optimizing their microstructure. This study provides valuable insights for enhancing material toughness and extending the lifespan of titanium alloys in applications such as aerospace and biomedical engineering.

摘要

本研究探讨了通过激光金属沉积（LMD）成型并经过双重退火处理的TC11钛合金的疲劳行为和断裂机制。研究重点在于由交替的等轴晶和柱状晶组成的合金独特微观结构如何影响其疲劳性能。微观结构中由板状和针状结构组成的篮状α'相导致了裂纹扩展行为的变化，如裂纹扩展速率与应力强度之间的关系所示。对滑移模式的分析表明，与柱状晶中分布更均匀的变形相比，等轴晶经历更频繁的变形，加速了裂纹扩展。这些发现为通过优化微观结构提高3D打印钛合金的抗疲劳性能提供了一种新方法。本研究为提高材料韧性以及延长钛合金在航空航天和生物医学工程等应用中的使用寿命提供了有价值的见解。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ed1/11677222/7b767a2d931d/materials-17-06112-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ed1/11677222/7b767a2d931d/materials-17-06112-g014.jpg

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本文引用的文献

1
An Overview of Laser Metal Deposition for Cladding: Defect Formation Mechanisms, Defect Suppression Methods and Performance Improvements of Laser-Cladded Layers.激光熔覆用激光金属沉积概述：缺陷形成机制、缺陷抑制方法及激光熔覆层的性能改进
Materials (Basel). 2022 Aug 11;15(16):5522. doi: 10.3390/ma15165522.
2
The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components.多孔性对增材制造钛部件疲劳裂纹萌生的影响。
Sci Rep. 2017 Aug 4;7(1):7308. doi: 10.1038/s41598-017-06504-5.