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首页> 外文期刊>ISIJ international >Identification of Precipitate Phases in an 11%Cr Ferritic/martensitic Steel after Short-term Creep
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Identification of Precipitate Phases in an 11%Cr Ferritic/martensitic Steel after Short-term Creep

机译：短期蠕变后11％Cr铁素体/马氏体钢中析出相的确定

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To further increase steam temperature in ultra-supercritical power plants, 9–12%Cr ferritic/martensitic (FM) steels with target operating temperatures up to 650°C and higher are being developed. An 11% Cr F/M steel was prepared by reference to the nominal chemical composition of SAVE12 steel with an expected maximum use temperature of 650oC. Precipitate phases in the 11%Cr FM steel after a short-term creep at 600°C/180 MPa for 1100 h were investigated by transmission electron microscopy with energy dispersive X-ray spectrometers. Precipitate phases in the crept steel were identified to be Fe-W-Cr-rich M_(6)C carbide, Cr-rich M_(23)C_(6) and M_(7)C_(3) carbides, Fe-rich Laves phase, Nb-Ta-rich/Ta-Nb-rich/V-rich MX phases, as well as Fe-Cr-rich sigma phase. The identified M_(6)C carbides with a f.c.c. crystal structure have a metallic element composition of about 41Fe, 31W, 20Cr, and 4Ta (in at.%) and an irregular block-like morphology with sizes ranging from 70 to 310 nm in diameter. The M_(6)C and Cr-rich M_(7)C_(3) carbides, as well as Fe-W-rich Laves phase are considered to be formed during the creep. The present investigation reveals that the M_(6)C carbide is a dominant phase in the steel after the creep. The formation of the M_(6)C carbide in the crept steel is also discussed.
机译：为了进一步提高超超临界电厂的蒸汽温度，正在开发9-12％Cr铁素体/马氏体（FM）钢，其目标工作温度可达650°C或更高。参考SAVE12钢的标称化学成分，制备了11％Cr F / M钢，预期最高使用温度为650oC。通过透射电子显微镜和能量色散X射线谱仪研究了11％Cr FM钢在600°C / 180 MPa短期蠕变1100 h后的析出相。蠕变钢中的沉淀相被确定为富Fe-W-Cr的M_（6）C碳化物，富Cr的M_（23）C_（6）和M_（7）C_（3）碳化物，富Fe的Laves相，富Nb-Ta / Ta-Nb / V的MX相以及富Fe-Cr的σ相。鉴定出的M_（6）C碳化物具有f.c.c.晶体结构具有约41Fe，31W，20Cr和4Ta（at。％）的金属元素组成，并且具有不规则的块状形态，直径范围为70-310 nm。认为在蠕变过程中形成了M_（6）C和富Cr M_（7）C_（3）碳化物，以及富Fe-W的Laves相。目前的研究表明，蠕变后，M_（6）C碳化物是钢中的主要相。还讨论了the钢中M_（6）C碳化物的形成。

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