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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41479

Title: Effects of microstructures on the notch tensile fracture feature of heat-treatedTi–6Al–6V–2Sn alloy
Authors: Rong-Tan Huang
Wen-Liang Huang
Rong-Hsin Huang
Leu-Wen Tsay
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: Fracture
Titanium alloys
Electron microscopy
Notch tensile strength
Date: 2014
Issue Date: 2017-02-21T05:51:46Z
Publisher: Materials Science and Engineering A
Abstract: Abstract: The notch tensile strength (NTS) of Ti–6Al–6V–2Sn (Ti–6–6–2) specimens heat-treated using distinct processes was investigated at various aging temperatures and correlated to microstructures. Supratransus-processed and subtransus-processed specimens were, respectively, solution-treated at 965 °C (above the β transus) and 900 °C (below the β transus), before being water-quenched and aged at specific temperatures (482 °C, 593 °C, and 704 °C). Following the water quenching, titanium martensite (α' or α″) formed and decomposed into α and β phases with various sizes while aging. Additionally, the specimens that were aged at 482 °C achieved the peak hardness, but they were susceptible to notch brittleness and exhibited inferior NTS because a predominantly transgranular quasi-cleavage fracture separated along the α/β interface, regardless of the type of solution treatment. As the aging temperature increased, the NTS improved remarkably. This was attributed to the coarse α+β colony structure that formed in the aged specimen. The structure can facilitate crack-branching or micro-cracking under tensile straining, thereby improving fracture toughness and notch blunting while testing the NTS. Furthermore, under the same aging treatment, the NTS of the subtransus-processed specimens was greater than that of the supratransus-processed specimens, particularly for the specimens aged at 482 °C and 593 °C, which resulted from the retarding effect of the primary α on the crack front, higher volume fraction of the β phase, and absence of the intergranular fracture in the subtransus-processed specimens while executing the notch tensile test.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41479
Appears in Collections:[光電科學研究所] 期刊論文

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