材料工程2018，Vol.46Issue(1)：74-82,9.DOI:10.11868/j.issn.1001-4381.2015.000305
水蒸气温度对700℃先进超超临界锅炉候选合金GH2984氧化行为的影响
Effect of Steam Temperature on Oxidation Behavior of GH2984 Alloy as a Candidate for 700℃ Advanced Ultra-supercritical Boilers
摘要
Abstract
The oxidation behavior of GH2984 alloy in pure steam at 750℃ and 850℃ was investigated by using X-ray diffractometer (XRD) and scanning electron microscope equipped with energy dispersive spectra (SEM/EDS).Results show that GH2984 alloy is oxidized parabolically with time.The temperature rising greatly promotes the external and internal oxidation and also the evaporation of Cr.The composition and microstructure of the oxide films change obviously.At 750℃,a compact and single-layered (Cr,Mn)2O3 film is formed on alloy surface;the number of voids in oxide scale increases at 850℃,whereas a three-layered oxide scale consisting of thin Fe2TiO5 outer layer and much thicker (Cr,Mn)2O3 middle layer and thinner (Nb,Mo)2O5 inner layer is formed at the elevated temperature.Ti and Al are internally oxidized preferentially along grain boundaries to be TiO2 and Al2O3,respectively;both the number and the size of the two internal oxides increase with the temperature rising.关键词
GH2984高温合金/先进超超临界燃煤电站/水蒸气/高温氧化Key words
GH2984 superalloy/advanced ultra-supercritical coal-fired power plant/steam/high temperature oxidation分类
矿业与冶金引用本文复制引用
杨珍,鲁金涛,张夏妮,赵新宝,袁勇,党莹樱,尹宏飞,谷月峰..水蒸气温度对700℃先进超超临界锅炉候选合金GH2984氧化行为的影响[J].材料工程,2018,46(1):74-82,9.基金项目
国家自然科学基金项目(51401163,51301130) （51401163,51301130）
