Dynamic strain aging in low cycle fatigue of duplex titanium alloys

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:528

Article

Lin, Yi-Hsiang¹  Hu, Kan-Hung²  Kao, Fang-Hsin³  Wang, Shing-Hoa¹  Yang, Jer-Ren³  Lin, Chih-Kuang⁴ 

[1] Natl Taiwan Ocean Univ, Dept Mech Engn, Keelung 20224, Taiwan

[2] Natl Taiwan Ocean Univ, Inst Mat Engn, Keelung 20224, Taiwan

[3] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 10617, Taiwan

[4] Natl Cent Univ, Dept Mech Engn, Chungli 32001, Taiwan

关键词: Titanium alloys;    Low cycle fatigue;    Dynamic strain aging;   

DOI  :  10.1016/j.msea.2011.02.013

来源: Elsevier

【 摘 要 】

The influence of dynamic strain aging (DSA) on low cycle fatigue (LCF) in duplex Ti-6-4 and SP700 titanium alloys was studied. LCF was performed within the temperature range from 350 degrees C to 450 degrees C, at strain rates of 10(-3) s(-1) and 10(-4) s(-1), and strain amplitudes of 1.25% and 2%. DSA appeared as serrations at the plastic portion of the cyclic stress-strain hysteresis loop, as well as stress humps appearing in the cyclic stress response (CSR) curve of peak tensile stress response versus cycle number. Strain-induced micro twin formation was only observed in the sample after fatigue with 2% strain amplitude under a 10(-4) s(-1) strain rate, indicating that it is a DSA induced phenomenon. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

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