Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1564993 | Journal of Nuclear Materials | 2014 | 6 Pages |
Abstract
Oxide dispersion strengthened (ODS) steels exhibit exceptional radiation resistance and high-temperature creep strength when compared to traditional ferritic and ferritic/martensitic (F/M) steels. Their excellent mechanical properties result from very fine nanoparticles dispersed within the matrix. In this work, we applied a high-energy synchrotron radiation X-ray to study the deformation process of a 9Cr ODS steel. The load partitioning between the ferrite/martensite and the nanoparticles was observed during sample yielding. During plastic deformation, the nanoparticles experienced a dramatic loading process, and the internal stress on the nanoparticles increased to a maximum value of 3.7Â GPa, which was much higher than the maximum applied stress (â¼986Â MPa). After necking, the loading capacity of the nanoparticles was significantly decreased due to a debonding of the particles from the matrix, as indicated by a decline in lattice strain/internal stress. Due to the load partitioning, the ferrite/martensite slightly relaxed during early yielding, and slowly strained until failure. This study develops a better understanding of loading behavior for various phases in the ODS F/M steel.
Related Topics
Physical Sciences and Engineering
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Nuclear Energy and Engineering
Authors
Kun Mo, Zhangjian Zhou, Yinbin Miao, Di Yun, Hsiao-Ming Tung, Guangming Zhang, Weiying Chen, Jonathan Almer, James F. Stubbins,