期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.04.016
关键词
Atom probe tomography; ODS steel; High rate; Dynamic strain aging
类别
资金
- Army Research Laboratory [W911NF-15-2-0038]
- [ARO-W911NF-15-2-0050]
Mechanically alloyed 91Fe-8Ni-1Zr (at%) powders were fabricated through high energy ball milling of elemental powder and subsequently consolidated via equal channel angular extrusion (ECAE) at 800 degrees C and 1000 degrees C. The resulting microstructure was fine grain with a nano-dispersion of Zr-oxide within the matrix, which was spherical for the 800 degrees C. ECAE and plate-like (and volumetrically larger) for the 1000 degrees C ECAE conditions. Atom probe tomography confirmed trace levels of C, N, and Cr impurities within the alloy making it similar to a low-carbon steel. By performing mechanical testing at a quasi-static strain rate (10(-3)s(-1)) and at high strain rate (10(3)s(-1)) at room temperature and 473 K, a load drop was noted after yielding. In general, this load drop became more pronounced with increasing strain rate and temperature and has been shown to be a result of dynamic strain aging in the ODS alloy.
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