Steam oxidation and mechanical performance of a ferritic–martensitic steel with slurry aluminide coating,Materials and Corrosion

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Steam oxidation and mechanical performance of a ferritic–martensitic steel with slurry aluminide coating
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-02-25 , DOI: 10.1002/maco.202011554
Xiaodong Hou _{1,

2,

3} , Huixing Zhang ₁ , Maud Seraffon ₄ , Antony T. Fry ₁

Affiliation

A key route to advancing power plant efficiency is to enhance current steam operating parameters, namely, increase in steam temperature and pressure from the current levels of 540°C and 180 bar to the proposed 700°C (EU) and 300 bar. Conventional ferritic–martensitic steels, while having good mechanical properties and fatigue resistance, do not possess the high‐temperature corrosion resistance for long‐term use, with a temperature limit of ~620°C. Adding aluminide coatings to the surfaces of the steels can improve the oxidation resistance of this class of material through the growth of an Al₂O₃ scale. One of the major concerns in using coating is the potential deleterious effects on the mechanical properties of the substrate, either through the precipitation of brittle phases or through cracks in the coating. This study compares the microstructural features of slurry aluminide coatings applied to Grade 91 and the change in mechanical performance. The tensile, thermomechanical fatigue and creep test results showed that while the coated samples entered the tertiary creep zone earlier than the uncoated ones, cracking of the coating remained confined to the surface of the specimen. Nanoindentation mapping showed a hardness increase in the coating and within the aluminium diffusion zone, which is related to the exposure time.

中文翻译：

浆态铝化物涂层的铁素体-马氏体钢的蒸汽氧化和力学性能

提高发电厂效率的关键途径是提高当前的蒸汽运行参数，即将蒸汽温度和压力从目前的540°C和180 bar提高到拟议的700°C（EU）和300 bar。传统的铁素体-马氏体钢虽然具有良好的机械性能和耐疲劳性，但在长期使用时却不具备耐高温腐蚀性能，其温度极限约为620°C。在钢表面添加铝化物涂层可以通过生长Al ₂ O ₃来提高此类材料的抗氧化性规模。使用涂层的主要问题之一是通过脆性相的沉淀或涂层中的裂纹对基材机械性能的潜在有害影响。这项研究比较了应用于91级铝浆浆料的微观结构特征和机械性能的变化。拉伸，热机械疲劳和蠕变测试结果表明，尽管涂层样品比未涂层样品更早进入第三蠕变区，但涂层的开裂仍局限于样品表面。纳米压痕图显示涂层和铝扩散区内的硬度增加，这与暴露时间有关。

更新日期：2020-02-25

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