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<p>Four well known 8–-9%Cr ferritic martensitic steels, Eurofer-97, F82H, T91, and EM10, were investigated at SCK CEN. These materials with different heat treatments and chemical compositions were irradiated in the BR2 reactor at 290°C in the low-neutron dose range where post-irradiation effects are the most significant in terms of damage rate. Accurate neutron dosimetry allowed the individual determination of the precise dpa dose of each irradiated specimen. Static tensile tests were performed at room temperature and 300°C before and after irradiation to assess the radiation-induced hardening. The results suggest that the replacement of Mo by W seems to significantly affect the work-hardening capacity of the steel, promoting premature plastic flow localization upon irradiation. Second, the three steels, E97, F82H, and EM10, exhibit a unique <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\Delta \sigma_{\gamma}(\Phi_{\text{dpa}})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Δ</mi> <msub> <mi>σ</mi> <mi>γ</mi> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi mathvariant="normal">Φ</mi> <mtext>dpa</mtext> </msub> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> trend curve, while the T91-trend curve is clearly higher, in particular in the early stage of irradiation, below ~ 0.2 dpa. The plastic instability stress, σ<sub>PIS</sub>, increases monotonically with neutron exposure. Contrary to what is reported in the literature for low-temperature irradiation, the true stress–true strain curves do not superimpose when shifted with respect to the unirradiated flow curve, indicating that the post-yield mechanisms are different. Further detailed microstructural investigations are required to better understand the behavior of these steels under irradiation.</p>

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Comparative Study of Neutron Irradiation Hardening on Four Ferritic Martensitic Steels, Eurofer-97, T91, F82H, and EM10 Exposed at 290°C in the Low dpa Range

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Rachid Chaouadi,
  • Jan Wagemans

摘要

Four well known 8–-9%Cr ferritic martensitic steels, Eurofer-97, F82H, T91, and EM10, were investigated at SCK CEN. These materials with different heat treatments and chemical compositions were irradiated in the BR2 reactor at 290°C in the low-neutron dose range where post-irradiation effects are the most significant in terms of damage rate. Accurate neutron dosimetry allowed the individual determination of the precise dpa dose of each irradiated specimen. Static tensile tests were performed at room temperature and 300°C before and after irradiation to assess the radiation-induced hardening. The results suggest that the replacement of Mo by W seems to significantly affect the work-hardening capacity of the steel, promoting premature plastic flow localization upon irradiation. Second, the three steels, E97, F82H, and EM10, exhibit a unique \(\Delta \sigma_{\gamma}(\Phi_{\text{dpa}})\) Δ σ γ ( Φ dpa ) trend curve, while the T91-trend curve is clearly higher, in particular in the early stage of irradiation, below ~ 0.2 dpa. The plastic instability stress, σPIS, increases monotonically with neutron exposure. Contrary to what is reported in the literature for low-temperature irradiation, the true stress–true strain curves do not superimpose when shifted with respect to the unirradiated flow curve, indicating that the post-yield mechanisms are different. Further detailed microstructural investigations are required to better understand the behavior of these steels under irradiation.