Please use this identifier to cite or link to this item:
http://nopr.niscpr.res.in/handle/123456789/30407| Title: | Long crack growth mechanisms in Ti-6Al-4V alloy |
| Authors: | Goswami, T |
| Issue Date: | Oct-2005 |
| Publisher: | NISCAIR-CSIR, India |
| IPC Code: | C22C14/00 |
| Abstract: | A transition mechanism of long crack growth from
structure sensitive (Regime I) to insensitive region (Regime II) was investigated
at (i) room temperature under high humidity conditions, and (ii) elevated temperatures
for Ti-6AI-4V alloy and
other materials. Constant amplitude tests were
conducted using several stress ratios (R = 0.05, 0.1, 0.4 and 0.7) for the high humidity tests and 0.1 for room and elevated temperature tests.
Conventionally forged Ti-6AI-4V alloy disks, processed to
the solution treated and over-aged condition, were
studied for both programs. An increase in stress ratio and temperature lowered
the transitional stress intensity factor range where Regime I transitioned to
Regime II. Higher stress ratios (R = 0.7)
accelerated the fatigue crack growth rates many
times the crack growth rates obtained at lower stress ratios (R = 0.05). However, higher temperatures (345°C)
influenced the crack growth rates only marginally. The mechanisms controlling elevated
temperature fatigue crack growth in Ti-6AI-4V were by the secondary crack
formation, striations and some cavity features on the fracture surface. The
damage was localized on the α platelets, where a type dislocations found with
the Burgers vectors (a/2)<11  0>
g = 1010 near (10  0).
|
| Page(s): | 367-375 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Appears in Collections: | IJEMS Vol.12(5) [October 2005] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJEMS 12(5) 367-375.pdf | 2.05 MB | Adobe PDF | View/Open |
Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.