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.
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.
UR - https://www.scopus.com/pages/publications/84905398676
U2 - 10.1016/j.jnucmat.2014.06.060
DO - 10.1016/j.jnucmat.2014.06.060
M3 - 文章
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 -