Interlaboratory Study of Strain-Cycle Fatigue of 1.2-mm-Thick Sheet Specimens

Three sets of strain-cycled fatigue tests have been conducted at three laboratories on wrought 70-30 Cu-Ni. The data reported herein provide an unnotched fatigue-failure curve of this material suitable for design purposes.

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Strain-Cycle Fatigue of Sheet and Plate Steels III: Tests of Notched Specimens

10.4271/830176 ◽

1983 ◽

Author(s):

G. A. Miller ◽

H. S. Reemsnyder

Keyword(s):

Cycle Fatigue ◽

Strain Cycle ◽

Notched Specimens ◽

Plate Steels

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Strain-Cycle Fatigue of Steel Sheet and Plate Grades in Ambient and Aqueous Environments

10.4271/840288 ◽

1984 ◽

Author(s):

G. A. Miller

Keyword(s):

Steel Sheet ◽

Cycle Fatigue ◽

Strain Cycle ◽

Aqueous Environments

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Strain-Cycle Fatigue of Sheet and Plate Steels II: Some Practical Considerations in Applying Strain-Cycle Fatigue Concepts

10.4271/830173 ◽

1983 ◽

Author(s):

G. A. Miller ◽

H. S. Reemsnyder

Keyword(s):

Cycle Fatigue ◽

Strain Cycle ◽

Plate Steels

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Low-Cycle Fatigue Behavior of HAYNES® 282® Alloy and Other Wrought Gamma-Prime Strengthened Alloys

Volume 5: Turbo Expo 2007 ◽

10.1115/gt2007-28267 ◽

2007 ◽

Cited By ~ 5

Author(s):

L. M. Pike

Keyword(s):

Creep Strength ◽

Thermal Fatigue ◽

Low Cycle Fatigue ◽

Fatigue Behavior ◽

Sheet Material ◽

Microstructural Characterization ◽

Test Method ◽

Thick Sheet ◽

Cycle Fatigue ◽

Gamma Prime

Key properties for wrought gamma-prime strengthened alloys used in aero and land-based gas turbine engines include fabricability, creep strength, and resistance to thermal fatigue. Since a definitive test method for measuring thermal fatigue resistance has not yet been accepted in the industry, isothermal low cycle fatigue (LCF) data are often used as a substitute. In this study, the LCF behavior of several gamma-prime strengthened sheet alloys was investigated. The test program emphasized the LCF behavior of HAYNES® 282® alloy, a material designed for excellent creep strength and fabricability (especially weldability). Data was also taken on other gamma-prime strengthened alloys including 263 alloy, R-41 alloy, and Waspaloy alloy for which little to no data existed in literature for sheet material. Fully reversed, strain-controlled LCF testing was performed at temperatures ranging from 1200 to 1600°F (649 to 871°C) on 0.125” (3.2 mm) thick sheet. The results of the testing are presented along with some microstructural characterization. HAYNES and 282 are registered trademarks of Haynes International.

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Decomposition of the metastable beta titanium alloy Ti-15-3

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100075117 ◽

1983 ◽

Vol 41 ◽

pp. 264-265

Author(s):

Y. L. Chen ◽

S. Fujlshiro

Keyword(s):

Low Cost ◽

High Strength ◽

Alpha Phase ◽

Thick Sheet ◽

Omega Phase ◽

Beta Titanium Alloy ◽

Beta Titanium ◽

Beta Matrix ◽

Metastable Beta ◽

Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

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Preparation of cross-sectional samples for near-surface TEM studies

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010012669x ◽

1987 ◽

Vol 45 ◽

pp. 380-381

Author(s):

R.C. Dickenson ◽

K.R. Lawless

Keyword(s):

Standard Sample ◽

Surface Region ◽

Specimen Preparation ◽

Thick Sheet ◽

Drill Bit ◽

Sample Holder ◽

Metal Interface ◽

Cross Sectional ◽

Near Surface ◽

Cold Worked

In thermal oxidation studies, the structure of the oxide-metal interface and the near-surface region is of great importance. A technique has been developed for constructing cross-sectional samples of oxidized aluminum alloys, which reveal these regions. The specimen preparation procedure is as follows: An ultra-sonic drill is used to cut a 3mm diameter disc from a 1.0mm thick sheet of the material. The disc is mounted on a brass block with low-melting wax, and a 1.0mm hole is drilled in the disc using a #60 drill bit. The drill is positioned so that the edge of the hole is tangent to the center of the disc (Fig. 1) . The disc is removed from the mount and cleaned with acetone to remove any traces of wax. To remove the cold-worked layer from the surface of the hole, the disc is placed in a standard sample holder for a Tenupol electropolisher so that the hole is in the center of the area to be polished.

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