EFFECT OF ALLOYING ADDITIONS ON OXIDATION BEHAVIORS OF Ni-Fe BASED SUPERALLOY FOR ULTRA-SUPERCRITICAL BOILER APPLICATIONS

摘要：

　　A new kind of Ni-Fe-based superalloy is designed recently for 750 ℃-class A-USC boiler tube.The oxidation behavior of the designed alloys with various combinations of anti-oxidation additions,Cr,Al and Si,was investigated at 750℃ and 850℃,respectively.The results indicated that the oxidation rate of tested alloys decreased with the increase of the sum of additions.Cr addition may drop the relative constant of parabolic rate greatly when temperature is raised.But the oxide scale,mainly consisted of NiCr spinel at 750℃ and NiCrMn spinel at 850℃,was similar while the Cr content is in a range of 20-25 wt.%at tested temperatures.Al addition,however,showed the best effective to reduce the oxidation rates.Internal Al-rich oxide was observed at the scale/metal interface for alloys added with high content of Al and was increased with Al content increase.Very tiny difference between the oxide scales of the Si-added alloys was identified when Si content varies among 0.02-0.05 wt.%.Basing on these results,this presentation discussed the optimum combination of anti-oxidation additions as well as oxidation mechanisms in the designed Ni-Fe-base superalloy.

关键词： supercritical Fe-Ni alloy oxidation alloying additions boiler

作者: Jintao Lu Zhen Yang Xinbao Zhao Jingbo Yan Y Gu

作者单位: National Engineering Research Center of Clean Coal Combustion for Utility Boilers,Xian Thermal Power Research Institute Co.,Ltd.,Xian,710032,China

会议类型: 国际会议

会议名称: Energy Materials 2014(第一届能源材料国际会议)

会议地点: 西安

会议语种:英文

页码: 175-184

在线出版日期: 2014-11-04（万方平台首次上网日期，不代表论文的发表时间）