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- Title
Dislocation Damping and Microstructural Evolutions during Creep of 2.25Cr-1Mo Steels.
- Authors
Ohtani, Toshihiro; Ogi, Hirotsugu; Hirao, Masahiko
- Abstract
We studied the microstructural evolution of 2.25Cr-lMo steels subjected to tensile creep at 923 K through monitoring of shear-wave attenuation and velocity, using electromagnetic acoustic resonance (EMAR). Contactless transduction based on the magnetostrictive mechanism is the key to establishing a monitor for microstructural change in the bulk of the metals with a high sensitivity. In the short interval, 50 to 60 pct of the creep life, attenuation experiences a peak, being independent of the applied stress. This novel phenomenon is interpreted in terms of the drastic change in dislocation mobility and rearrangement, which is supported by transmission electron microscopy (TEM) observations for dislocation structure. At this particular period, the dense dislocation structure starts to transform to subgrain boundaries, which temporally accompanies long, free dislocation, absorbing much ultrasonic energy to produce the attenuation peak. The EMAR has the potential to assess the damage advance and to predict the remaining creep life of metals.
- Subjects
MICROSTRUCTURE; METAL creep; SHEAR waves; ELECTROMAGNETISM; STRENGTH of materials; METALS testing
- Publication
Metallurgical & Materials Transactions. Part A, 2005, Vol 36, Issue 2, p411
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-005-0312-z