Environmentally assisted fatigue crack nucleation in Ti-6Al-2Sn-4Zr-6Mo

被引：17
|
作者：
Chapman, T. P. [1 ]
Chater, R. J. [1 ]
Saunders, E. A. [2 ]
Walker, A. M. [3 ]
Lindley, T. C. [1 ]
Dye, D. [1 ]
机构：
[1] Univ London Imperial Coll Sci Technol & Med, Royal Sch Mines, Dept Mat, London SW7 2BP, England
[2] Rolls Royce PLC, Mat Failure Invest, Bristol BS34 7QE, Avon, England
[3] Rolls Royce PLC, Derby DE24 8BJ, England
来源：
CORROSION SCIENCE | 2015年 / 96卷
基金：
英国工程与自然科学研究理事会;
关键词：
Titanium; STEM; SIMS; Hot corrosion; Stress corrosion; Oxidation; STRESS-CORROSION CRACKING; BETA-TITANIUM-ALLOYS; SUSTAINED-LOAD CRACKING; HOT-SALT; HYDROGEN EMBRITTLEMENT; GASEOUS-HYDROGEN; ALPHA-TITANIUM; GROWTH; MODEL; SIMS;
D O I：
10.1016/j.corsci.2015.03.013
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An unexplained feature was observed at the fatigue crack origin of a number of alpha/beta titanium specimens tested at 450 degrees C in the low cycle fatigue regime. The origin was discoloured blue but this was not a result of temper colouration; this feature sometimes resulted in large reductions in fatigue lives. A number of specimens were examined to determine the cause and formation mechanism of these "blue spots." This feature was associated with elevated oxygen and chloride levels and the presence of sodium. A mechanism based on hot-salt stress-corrosion cracking is proposed and the implications for service components are discussed. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：87 / 101
页数：15
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