Effect of pressure on supercritical CO2 compatibility of structural alloys at 750 °C
Effect of pressure on supercritical CO2 compatibility of structural alloys at 750 °C
复制标题
DOI：
10.1002/maco.201508783
复制
发表时间：
2017-02
期刊：
影响因子：
--
通讯作者：
B. Pint;R. Brese;J. Keiser
中科院分区：
文献类型：
--
作者：
B. Pint;R. Brese;J. Keiser
几种发电技术对采用超临界CO2（sCO 2）循环感兴趣，但在200-300 bar的目标压力范围内，特别是在≥700 °C下，进行了相对较少的相容性工作。为了利用较低压力的数据集（特别是控制O2和H2O含量），该初步评估比较了1-300 bar的CO2压力在750 °C下暴露500 h后对潜在Fe基和Ni基结构合金相容性的影响。对于高度合金化的氧化铝和氧化铬形成合金，观察到压力对质量变化和反应产物的影响最小，这与在1巴干燥空气、CO2、CO2-0.15%O2和CO2-10%H2O中观察到的结果相似。在这些相对较短的暴露之后，没有明显的内部渗碳迹象，并且沉淀强化的Ni基合金（740和282）中的Cr消耗是最小的。除试样外，还将740、247、310 HCbN和E-Brite（Fe-Cr）合金的25 mm长拉伸试样暴露在每种条件下，但未显示出高纯CO2环境对室温拉伸性能的任何不利影响。
Several power generation technologies have interest in employing a supercritical CO2 (sCO2) cycle but relatively little compatibility work has been conducted at the target pressure range of 200–300 bar, particularly at ≥700 °C. With the goal of utilizing lower pressure data sets (especially with controlled O2 and H2O contents), this initial assessment compared the effect of CO2 pressure at 1–300 bar on the compatibility of potential Fe‐ and Ni‐base structural alloys after 500 h exposures at 750 °C. For highly‐alloyed alumina‐ and chromia‐forming alloys, a minimal effect of pressure was observed on the mass change and reaction products, which were similar to those observed in 1 bar dry air, CO2, CO2–0.15%O2 and CO2–10%H2O. After these relatively short exposures, there was no obvious indication of internal carburization and the Cr depletion in the precipitation strengthened Ni‐base alloys (740 and 282) was minimal. In addition to coupons, 25 mm long tensile specimens of alloy 740, 247, 310HCbN, and E‐Brite (Fe–Cr) were exposed in each condition but did not show any detrimental effect of the high‐purity CO2 environments on room temperature tensile properties.