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首页> 外文期刊>Metallurgical and Materials Transactions, E. Materials for Energy Systems >A Novel Martensitic Creep-Resistant Steel Strengthened by MX Carbonitrides with Extremely Low Coarsening Rates: Design and Characterization
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A Novel Martensitic Creep-Resistant Steel Strengthened by MX Carbonitrides with Extremely Low Coarsening Rates: Design and Characterization

机译：MX碳氮化物增强的新型马氏体抗蠕变钢，粗化率极低：设计和表征

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摘要

A general computational alloy design approach, based on thermodynamics and thermokinetics and coupled with a genetic algorithm optimization routine, was applied to the design of novel creep martensitic resistant steels. The optimal alloy suggested by the model has a high density of barely coarsening MX carbonitride precipitates. The model yielded precise values for the concentrations of the 10 alloying elements considered. The model alloy was produced on a 10 kg lab scale. Samples of the new alloy of one of the best commercial martensitic steels on the market P92 were subjected to a high aging temperature of 923 K (650 °C) for times up to 1000 hours. The microstructure of the new alloy in the as-produced state as well as after 1000 hours exposure has all the intended features as predicted by the model. The coarsening rate of the MX rate carbonitrides was substantially lower than that of the precipitates in the P92 steel. The very low coarsening rate explains the superior hardness at very long exposure times.
机译：一种基于热力学和热动力学的通用计算合金设计方法，并结合遗传算法优化程序，被用于新型抗蠕变马氏体钢的设计。该模型建议的最佳合金具有高密度，几乎不粗化MX碳氮化物沉淀。该模型为所考虑的10种合金元素的浓度提供了精确的值。模型合金的实验室规模为10 kg。 P92市场上最好的商业马氏体钢之一的新合金样品经受了923 K（650°C）的高温时效，长达1000小时。新合金处于生产状态以及暴露1000小时后的微观结构具有模型所预测的所有预期特征。 MX速率碳氮化物的粗化速率远低于P92钢中析出物的粗化速率。极低的粗化率说明了在很长的曝光时间下具有优异的硬度。

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