Journal Published Online: 06 December 2021
Volume 50, Issue 2

Role of Duplex Aging Treatment on the Fatigue Crack Propagation Behavior of Ti-15V-3Al-3Sn-3Cr Metastable β Titanium Alloy

CODEN: JTEVAB

Abstract

In this study, the fatigue crack propagation behavior of Ti-15V-3Al-3Sn-3Cr alloy, in which aging treatments were applied, was investigated under constant and variable amplitude loading. Single-step and duplex (pre-aging + second-step aging) aging have been conducted on the alloy at low and high temperatures. Duplex aging was applied with two different pre-aging treatment temperatures and times (24 hours at 250°C and 10 hours at 300°C). During single-step aging, the precipitation-free zones reduced with the aging temperature increase; thus, the crack propagation rate of high-temperature-aged samples was lower than the low-temperature-aged samples. In the duplex-aging-treated samples, the second-step aging temperature increase negatively influenced the alloy's fatigue crack propagation rate. However, the prolonged second-step aging time caused a decrease in crack propagation rate, especially at low temperatures. After the application of overload, the crack propagation rate of the solution-treated sample increased because of the formation of secondary cracks along the crack propagation direction. On the other hand, in the aged specimen, the microcracks that formed between the α/β phases after the overload caused the sample to be fractured.

Author Information

Yumak, Nihal
Department of Mechanical Engineering, Afyon Kocatepe University, Afyon, Turkey
Aslantaş, Kubilay
Department of Mechanical Engineering, Afyon Kocatepe University, Afyon, Turkey
Pages: 13
Price: $25.00
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Details
Stock #: JTE20210300
ISSN: 0090-3973
DOI: 10.1520/JTE20210300