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| 铸造、锻造和粉末冶金TC4钛合金损伤容限行为对比研究 |
| Comparative Study on Damage Tolerance Properties of TC4 Titanium Alloy Manufactured by Casting, Forging and Powder Metallurgy |
| Received:April 08, 2018 Revised:May 10, 2018 |
| DOI：10.3969/j.issn.1674-6457.2018.03.009 |
| 中文关键词: 钛合金 断裂韧性 疲劳裂纹扩展 塑性区 网格法 |
| 英文关键词: titanium alloy fracture toughness fatigue crack growth plastic zone grid method |
| 基金项目:欧盟“地平线2020”研究与创新项目（690725）；工信部民用飞机专项科研（MJ-2015-H-G-104） |
| Author Name | Affiliation | | FENG Xin | 1. AECC Beijing Institute of Aeronautic Materials, Beijing 100095, China
2. Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology, Beijing 100095, China | | MA Ying-jie | Institute of Metal Research, Shenyang 110016, China | | LI Jian-chong | 1. AECC Beijing Institute of Aeronautic Materials, Beijing 100095, China
2. Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology, Beijing 100095, China | | DING Xian-fei | 1. AECC Beijing Institute of Aeronautic Materials, Beijing 100095, China
2. Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology, Beijing 100095, China | | NAN Hai | 1. AECC Beijing Institute of Aeronautic Materials, Beijing 100095, China
2. Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology, Beijing 100095, China | | CUI Yu-you | Institute of Metal Research, Shenyang 110016, China | | LEI Jia-feng | Institute of Metal Research, Shenyang 110016, China |
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| 中文摘要: |
| 目的 研究影响铸造、锻造和粉末冶金TC4钛合金的损伤容限行为差异的主要因素。方法 分别从裂纹尖端塑性变形行为、二次裂纹及断口表面粗糙度3个方面对比，分析造成3种成形方法制备的TC4钛合金的断裂韧性和疲劳裂纹扩展速率差异的原因。结果 铸造TC4钛合金断裂韧性优于锻造和粉末冶金TC4钛合金，主要是因为新产生的裂纹面积大，消耗更多断裂能量。铸造TC4钛合金疲劳裂纹扩展速率低于锻造、粉末冶金TC4钛合金，其主要原因为曲折的裂纹路径和断面粗糙度诱发裂纹闭合效应以及长而深的二次裂纹。结论 3种成形方法制备TC4钛合金损伤容限行为差异的主要原因是断裂形成了不同裂纹路径形貌。 |
| 英文摘要: |
| The paper aims to study main factors influencing discrepancy of damage tolerance behaviors of as-cast, as-forged and powder metallurgy TC4 titanium alloy. A comparative analysis of the main reasons for differences of the fracture toughness and fatigue crack propagation growth rates of TC4 titanium alloy manufactured by three forming methods was made from three aspects: plastic deformation behavior at crack tip, secondary cracks and fracture surface toughness. Results indicate that fracture toughness property of as-cast TC4 alloy was better than that of as-forged and powder metallurgy TC4 titanium alloys, which was mainly because that the area of newly generated fracture surface was larger, and more fracture energy was consumed. The fatigue crack growth rate of as-cast TC4 titanium alloy was lower than that of as-forged and powder metallurgy TC4 titanium alloy; and the main reason was that the crack closure effect induced by zigzag crack path and fracture surface roughness along with long and deep secondary cracks. The discrepancy of damage tolerance behavior of TC4 titanium alloy made by three forming methods is due to different crack path profiles formed by rupture. |
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