| The present work investigates the irradiation hardening of ODS ferritic steelsafter multi-energy He-ion implantation, or energetic Bi-ion and Xe-ion irradiation, toget an understanding of dependence of irradiation-hardening on atomic displacementdamage and gas accumulation. Three kinds of high-Cr ODS ferritic steels includingthe commercial MA956(19Cr-3.5Al), the16Cr-0.1Ti and the16Cr-0.1Zr ODSferritic steels were used. The results show that the hardness increases rapidly at lowerdoses but tends to saturate at higher dose. An1/2-power law dependence on dpavalue is observed. Helium implantation contributes significantly to the irradiationhardening, possibly due to the impediment of the motion dislocations by heliumbubbles.16Cr-ODS (Ti or Zr added) steels which contains finer oxide particles inhigher number density show higher resistance to irradiation hardening than thecommercial ODS steel MA956. |
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