论文标题
TA对Fecrni合金抗蠕变抗性的显着影响的起源
Origin of the Significant Impact of Ta on the Creep Resistance of FeCrNi Alloys
论文作者
论文摘要
耐热的Fecrni合金在石化产业中广泛使用，因为它们在超过900 $^\ Circ $ c的温度下表现出独特的蠕变和氧化耐药性的组合。它们的蠕变特性通常通过碳化物形成元件的微化度优化。在目前的工作中，已经对TA微附属的影响进行了实验研究，以了解该元素对蠕变耐药性的显着影响的起源。还进行了热族软件的计算以支持实验数据。结果表明，TA的一小部分是有益的，因为它增加了稳定的MC碳化物的体积分数。我们还证明，TA的添加可能对微观结构的热稳定性产生巨大影响。这归因于M23C6的平衡体积分数较小，并且在MC/基质接口处更明显的异质沉淀。然后讨论的对蠕变特性的影响。
Heat resistant FeCrNi alloys are widely used in the petrochemical industry because they exhibit a unique combination of creep and oxidation resistance at temperatures exceeding 900$^\circ$C. Their creep properties are often optimized by micro-additions of carbide forming elements. In the present work, the influence of Ta micro-additions has been experimentally investigated both on as-cast and aged microstructures to understand the origin of the significant impact of this element on the creep resistance. Calculations with thermocal software were also carried out to support experimental data. It is shown that a small addition of Ta is beneficial as it increases the volume fraction of stable MC carbides. We demonstrate also that additions of Ta may have a dramatic effect on the thermal stability of microstructures. This is attributed to a smaller equilibrium volume fraction of M23C6 and more pronounced heterogeneous precipitation at MC/matrix interfaces. The influence on the creep properties in then discussed.
