Abstract
Ti-6Al-4V forged materials which had fine grain size and commercial billet which had moderate grain size and micro texture were prepared. Cold dwell fatigue tests were conducted using both materials, and dwell time condition was up to 1800s. Fracture cycles and elongation were almost same on each specimen. Number of cycle to failure decreased with increase of dwell time. Fracture elongation increased up to dwell time of 10s, and it was constant in over 10s. Fracture surface were observed. In short time dwell condition up to 2s, fracture surface showed fatigue type. Fracture surfaces changed to dimple in over 10s dwell. In billet material, facets were observed in inner area of fracture surface.
Highlights
Titanium alloys have been used as important rotating parts of gas turbine engine known because of lightweight, excellent mechanical properties, and corrosion resistance
It was recently reported that cold dwell fatigue (CDF) properties and fracture behavior are affected by microstructure such as micro texture []
In a billet material there were micro texture by which the resemble orientations of α phase gathered, and its width was about 500μm at maximum. in contrast, α grain orientation were dispersed homogenously compared with billet
Summary
Titanium alloys have been used as important rotating parts of gas turbine engine known because of lightweight, excellent mechanical properties, and corrosion resistance. Hold of load during cyclic loading at ambient temperature decrease fatigue life significantly. It is known as cold dwell fatigue (CDF) [1,2,3,4,5,6,7,8,9,10,11,12]. CDF properties was investigated precisely on many kinds of alloy such as IMI685, IMI834 [1, 2], and Ti-6262 [3] From these reports, it have been clarified that fatigue life decrease with dwell is remarkable in following conditions, stress revel: over 85% yield stress, stress ratio: close to 0, temperature: up to 100°C. This study intends to investigate the fracture behavior with several dwell time conditions and microstructure
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