| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7987269 | Nuclear Materials and Energy | 2018 | 8 Pages |
Abstract
The objective of this study was to investigate the effect of nitrogen concentration on mechanical properties and nano-structure of 9Cr oxide dispersion strengthened (ODS) ferritic/martensitic steel. 9Cr-ODS specimens with the wide range of nitrogen concentration, from 0.004 to 0.110 wt%, were systematically investigated by hardness and tensile tests and several microstructural characterization methods. Hardness and tensile strength at 973â¯K were significantly decreased as nitrogen concentration increased, due to the decrease in the amount of the residual α-ferrite phase. Coarse inclusions containing Y and Ti, which could negatively affect creep strength and processability, were formed, and that suggested degradation of the nano-particle distribution. The technical knowledge obtained in this study will contribute towards the setting of a reasonable nitrogen concentration specification for 9Cr-ODS steel.
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Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Hiroshi Oka, Takashi Tanno, Satoshi Ohtsuka, Yasuhide Yano, Takeji Kaito,