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Computer simulation of the yield strength evolution in Cu-precipitation strengthened ferritic steel

机译：铜沉淀铁素体钢屈服强度演变的计算机模拟

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摘要

During ageing of steel containing a few percent Cu, a maximum increase of hardness and strength can be observed after several hours of annealing at around 500-550 ℃ This strength increase is caused by small coherent bcc-Cu-precipitates of 2-3 nm diameter. For consistent computer simulations of the early stages of precipitation, it is shown that variations in the equilibrium Fe-content of the bcc-Cu nuclei must be taken into account. The simulated precipitation parameters are compared to experimental data reported in literature. Good agreement between experiment and simulation can be achieved in terms of the evolution of phase fraction, number density and mean radius of the Cu-precipitates. Based on these results, different models for precipitation strengthening are assessed and their predictions compared to the experimentally observed strength evolution. We find that mainly the coherency strain and modulus strengthening effects contribute to the precipitation strengthening potential. Together with the intrinsic strength of the alloy and Cu solid-solution strengthening, a consistent description of the lower yield strength evolution during precipitation hardening of an Fe-1.4% Cu alloy is achieved.
机译：在含少量铜的钢时效过程中，在约500-550℃退火数小时后，可以观察到硬度和强度的最大增加。这种强度增加是由直径为2-3 nm的小的相干bcc-Cu沉淀物引起的。为了对降水的早期阶段进行一致的计算机模拟，表明必须考虑到bcc-Cu核的平衡铁含量的变化。将模拟的降水参数与文献报道的实验数据进行比较。在相沉淀的演变，数量密度和铜沉淀物的平均半径方面，可以实现实验与模拟之间的良好一致性。基于这些结果，评估了不同的降水加强模型，并将其预测与实验观察到的强度演变进行了比较。我们发现，主要的相干应变和模量强化作用有助于沉淀强化潜力。连同合金的固有强度和Cu固溶强化一起，获得了对Fe-1.4％Cu合金沉淀硬化过程中较低屈服强度演变的一致描述。

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