Effect of nitrogen concentration on nano-structure and high-temperature strength of 9Cr-ODS steel
Hiroshi Oka, Takashi Tanno, Satoshi Ohtsuka and 2 more
Nuclear Materials and Energy · 2018
doi:10.1016/j.nme.2018.05.010 (opens in a new tab)
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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 973 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. Keywords: ODS, Nitrogen, Ferrite, Martensite, α to γ reverse transformation, HT-XRD
Abstract licence: CC BY-NC
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