The objective of the present work is to evaluate isothermal uniaxial compressive deformation behavior of nano oxide dispersion-strengthened (n-ODS)-18Cr ferritic steel over a range of temperatures RT—1173 K and range of strain rates 10⁻⁴ to 10⁻² s⁻¹. Irrespective of temperature, the influence of the strain rate on the yield strength is insignificant up to 673 K. It is found that the plot of variation of yield strength as a function of temperature exhibits three regimes, which indicates that different deformation mechanisms are governing the yield strength of n-ODS-18Cr steel. Transmission electron microscopic analysis of a sample deformed at the highest temperature of 1173 K and the lowest strain rate of 10⁻⁴ s⁻¹ demonstrates no significant change in the grain size and nanoprecipitate size. Also, it confirms the interaction between dislocations and nanoprecipitates. Different deformation mechanisms governing the yield strength of n-ODS-18Cr steel are identified in all three regimes and their contributions are quantified.

本工作的目的是评估纳米氧化物弥散强化（n-ODS）-18Cr铁素体钢在温度RT-1173 K和应变率10 ^-4到10 ^-2的范围内的等温单轴压缩变形行为s ^-1。随温度变化，应变率对屈服强度的影响在673 K以下均不显着。发现屈服强度随温度变化的曲线显示出三种状态，这表明不同的变形机制控制着屈服强度。 n-ODS-18Cr钢的屈服强度。最高温度1173 K和最低应变速率10 ^-4 s ^-1变形的样品的透射电子显微镜分析证明晶粒尺寸和纳米沉淀尺寸没有明显变化。而且，它证实了位错和纳米沉淀物之间的相互作用。在所有这三种情况下，确定了控制n-ODS-18Cr钢屈服强度的不同变形机制，并对它们的作用进行了量化。