The effects of irradiation on the precipitation behavior of commercial PH 13-8 Mo maraging steel a.k.a. Corrax are investigated through in-situ ion irradiation. Samples of the alloy in its solution annealed state are irradiated up to 10 dpa at 573 and 773 K using 1 MeV Kr ions, in-situ in a transmission electron microscope in order to probe irradiation effects on the precipitation usually observed in this alloy under thermal aging. Indeed, the alloy is known to develop a relatively fine distribution of precipitates during thermal aging which gives the martensitic alloy its strength. The effects of irradiation are substantiated by comparing with the same material thermally aged at 773 and 873 K for similar amounts of experimental time. Both radiation and thermal aging induced segregation and precipitation are characterized using analytical transmission electron microscopy (TEM) techniques.

The diffusion coefficients under irradiation are estimated using the point defect balance equations based on Rate Theory and then compared with the thermal diffusion coefficients, demonstrating the accelerated precipitation of β-phase and Laves-phase in the irradiation case at relatively lower temperature is attributed to the radiation-enhanced diffusion. In addition, a numerical model based on classical precipitate nucleation and growth theories is introduced and shows a relatively good agreement with the experimental results in terms of precipitate density. This study serves to generate baseline data on ion irradiation effects on Corrax to learn how this steel responds to irradiation.

通过原位离子辐照研究了辐照对商用PH 13-8 Mo马氏体时效钢（又称Corrax）的析出行为的影响。使用1 MeV Kr离子在573和773 K下将处于溶液退火状态的合金样品辐照至10 dpa，并在透射电子显微镜中进行原位测试，以探究通常对该合金在热态下观察到的析出的辐照效应。老化。实际上，已知该合金在热时效过程中会形成相对较细的析出物分布，这使马氏体合金具有了强度。通过与在773和873 K下热老化的相同材料进行相似的实验时间比较，可以证实辐照的效果。

使用基于速率理论的点缺陷平衡方程估算辐照下的扩散系数，然后将其与热扩散系数进行比较，证明在较低温度下辐照情况下β相和Laves相的加速析出归因于辐射增强扩散。此外，引入了基于经典沉淀物成核和生长理论的数值模型，并在沉淀物密度方面显示出与实验结果相对较好的一致性。这项研究旨在生成有关Corrax上离子辐照影响的基线数据，以了解该钢如何响应辐照。