TY - JOUR
T1 - Synchrotron study on load partitioning between ferrite/martensite and nanoparticles of a 9Cr ODS steel
AU - Mo, Kun
AU - Zhou, Zhangjian
AU - Miao, Yinbin
AU - Yun, Di
AU - Tung, Hsiao Ming
AU - Zhang, Guangming
AU - Chen, Weiying
AU - Almer, Jonathan
AU - Stubbins, James F.
N1 - Funding Information:
This work was supported by the U.S. Department of Energy under Grants 973 DOE INL 120293 and NEUP 09-516 . Argonne National Laboratory’s work was supported under U.S. Department of Energy contract DE-AC02-06CH11357 . The authors would like to thank Dr. Meimei Li from the Argonne National Laboratory for technical assistance. The microstructural analysis was carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois, which are partially supported by the U.S. Department of Energy under Grants: DE-FG02-07ER46453 and DE-FG02-07ER46471 .
PY - 2014/12
Y1 - 2014/12
N2 - 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 3.7 GPa, which was much higher than the maximum applied stress (∼986 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.
AB - 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 3.7 GPa, which was much higher than the maximum applied stress (∼986 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.
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U2 - 10.1016/j.jnucmat.2014.06.060
DO - 10.1016/j.jnucmat.2014.06.060
M3 - Article
AN - SCOPUS:84905398676
SN - 0022-3115
VL - 455
SP - 376
EP - 381
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1-3
ER -