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Title: Low cycle dwell-time fatigue in Ti-6242

Abstract

Ambient-temperature, low-cycle dwell-time and conventional low-cycle fatigue tests were performed on Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242). Specimens were solution annealed at various temperatures below the beta transus to control the volume fraction of primary alpha phase and were subsequently shot-peened. The influence of the changes in primary alpha phase on the low-cycle dwell-time fatigue life (LCDF) were determined and compared to the conventional low-cycle fatigue (LCF) properties of the alloy. A 120-second dwell significantly decreased the number of cycles to failure, although the factor decrease of LCF from a dwell, in general, diminished with decreasing stress. The Increasing primary alpha phase associated with lower solution temperatures appears to increase susceptibility to low-cycle dwell-time fatigue. It also appears that the susceptibility to dwell fatigue may be associated with ambient-temperature, time-dependent, cyclic (creep) plasticity.

Authors:
 [1]; ;  [2]
  1. Oregon State Univ., Corvallis, OR (United States). Dept. of Mechanical Engineering
  2. Allegheny Teledyne Co, Albany, OR (United States)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
684456
Resource Type:
Journal Article
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 30; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FATIGUE; TITANIUM BASE ALLOYS; CHEMICAL COMPOSITION; ANNEALING; SHOT PEENING; TIME DEPENDENCE; MICROSTRUCTURE; CORRELATIONS

Citation Formats

Kassner, M.E., Kosaka, Y., and Hall, J.A. Low cycle dwell-time fatigue in Ti-6242. United States: N. p., 1999. Web. doi:10.1007/s11661-999-0246-y.
Kassner, M.E., Kosaka, Y., & Hall, J.A. Low cycle dwell-time fatigue in Ti-6242. United States. doi:10.1007/s11661-999-0246-y.
Kassner, M.E., Kosaka, Y., and Hall, J.A. Wed . "Low cycle dwell-time fatigue in Ti-6242". United States. doi:10.1007/s11661-999-0246-y.
@article{osti_684456,
title = {Low cycle dwell-time fatigue in Ti-6242},
author = {Kassner, M.E. and Kosaka, Y. and Hall, J.A.},
abstractNote = {Ambient-temperature, low-cycle dwell-time and conventional low-cycle fatigue tests were performed on Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242). Specimens were solution annealed at various temperatures below the beta transus to control the volume fraction of primary alpha phase and were subsequently shot-peened. The influence of the changes in primary alpha phase on the low-cycle dwell-time fatigue life (LCDF) were determined and compared to the conventional low-cycle fatigue (LCF) properties of the alloy. A 120-second dwell significantly decreased the number of cycles to failure, although the factor decrease of LCF from a dwell, in general, diminished with decreasing stress. The Increasing primary alpha phase associated with lower solution temperatures appears to increase susceptibility to low-cycle dwell-time fatigue. It also appears that the susceptibility to dwell fatigue may be associated with ambient-temperature, time-dependent, cyclic (creep) plasticity.},
doi = {10.1007/s11661-999-0246-y},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 9,
volume = 30,
place = {United States},
year = {1999},
month = {9}
}