http://scholars.ntou.edu.tw/handle/123456789/4660
標題: | Influence of Microstructures on the Notched Tensile Strength of Ti-4.5Al-3V-2Fe-2Mo Alloy | 作者: | Wei-Chih Chung Leu-Wen Tsay Yi-Shiung Ding Chun Chen |
關鍵字: | Ti-4.5Al-3V-2Fe-2Mo;microstructure;heat treatment;notched tensile strength;fracture | 公開日期: | 十月-2008 | 卷: | 49 | 期: | 10 | 起(迄)頁: | 2190-2195 | 來源出版物: | Materials Transactions | 摘要: | The notched tensile strength (NTS) of Ti-4.5Al-3V-2Fe-2Mo specimens with distinct heat treatment conditions was investigated and correlated to microstructures. The specimens were solution-treated at either 980 or 870°C (above or below the β-transus) and then water-quenched prior to aging treatments. After aging at 482, 593, and 704°C, titanium martensite (α′ or α″) decomposed into α and β with distinct sizes. Additionally, the specimens aged at 482°C were particularly susceptible to notch brittleness, regardless of the solution temperature. As the aging temperature increased, the lower hardness associated with coarsened α+β structures resulted in decreased notch brittleness of the alloy. In general, the specimens containing primary α in microstructure were prone to brittle fracture and reduced NTS. The alignment of martensite packets (or needles) with respect to the crack growth direction could affect the fracture appearance of the specimens, particularly for the coarse-grained specimens which were solution-treated at 980°C. Furthermore, the existence of grain boundary α for the specimens aged at 593°C or higher promoted grain boundary sliding during notched tensile tests. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/4660 | ISSN: | 1345-9678 | DOI: | 10.2320/matertrans.L-MRA2008831 |
顯示於: | 光電與材料科技學系 |
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