Effect of ripple loads on sustained-load cracking in titanium alloys

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00220-P· OSTI ID:103604

Pao, P S; Meyn, D A; Bayles, R A; Feng, C R ^[1]; Yoder, G R ^[2]

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1. Naval Research Laboratory, Washington, DC (United States)
2. Office of Naval Research, Arlington, VA (United States)

In the present paper, the authors have extended their study on the effect of the ripple loads on the sustained-load cracking (SLC) behavior of two titanium alloys, Ti-6Al-4V (an {alpha}-{beta} alloy) and Ti-15V-3Cr-3Al-3Sn (a {beta}-{alpha} alloy), in an ambient air environment. The methodology which has been used successfully to treat ripple effects on stress-corrosion cracking (SCC) is employed again to address the influence of ripple loads on sustained-load cracking. Ripple loads can significantly reduce the apparent sustained load cracking resistance of titanium alloys in a relatively benign environment such as ambient air. For a ripple-load amplitude equal to 5% of the sustained load, the ripple-load cracking thresholds (K{sub IRLC}) of beta-annealed Ti-6Al-4V and Ti-15V-3Cr-3al-3Sn are less than half of the respective sustained-load cracking thresholds (K{sub ISLC}). The extent of ripple-load degradation for these alloys in ambient air -- relative to K{sub ISLC}, were found comparable to those observed in a much more aggressive 3.5% NaCl aqueous solution.

• OSTI ID: 103604
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 3 Vol. 33; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ALUMINIUM ALLOYS
AQUEOUS SOLUTIONS
CHROMIUM ALLOYS
CRACK PROPAGATION
CRACKS
ENVIRONMENTAL EXPOSURE
FRACTURE PROPERTIES
HEAT TREATMENTS
SODIUM CHLORIDES
STRESS INTENSITY FACTORS
STRESSES
TIN ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ALLOYS