Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 500, Issue -, Pages 327-336Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2018.01.008
Keywords
Reduced activation ferritic/martensitic steels; Thermal aging; Microstructure; Precipitation; Tensile properties
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [NRF-2016M1A7A1A01005877, NRF-2017R1A1A1A05000754]
Ask authors/readers for more resources
The effects of Ti and Ta addition on microstructure stability and tensile properties of a reduced activation ferritic/martensitic (RAFM) steel have been investigated. Ti addition of 0.06 wt% to conventional RAFM reference base steel (Fe-9.3Cr-0.93W-0.22V-0.094Ta-0.1C) was intended to promote the precipitation of nano-sized (Ti, W) carbides with a high resistance to coarsening. In addition, the Ti addition was substituted for 0.094 wt% Ta. The Ti-added RAFM steel (Ti-RAFM) exhibited a higher yield strength (Delta YS = 32 MPa) at 600 degrees C than the reference base steel due to additional precipitation hardening by (Ti, W)-rich MX with an average size of 6.1 nm and the area fraction of 2.39%. However, after thermal exposure at 600 degrees C for 1000 h, this Ti-RAFM was more susceptible to degradation than the reference base steel; the block width increased by 77.6% in Ti-RAFM after thermal exposure while the reference base steel showed only 9.1% increase. In order to suppress diffusion rate during thermal exposure, the largesized Ta element with low activation was added to Ti-RAFM. The Ta-added Ti-RAFM steel exhibited good properties with outstanding microstructure stability. Quantitative comparison in microstructures was discussed with a consideration of Ti and Ta addition. (C) 2018 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available