首页|Oxidation behavior of 4774DD1 Ni-based single-crystal superalloy at 980 ℃ in air

Oxidation behavior of 4774DD1 Ni-based single-crystal superalloy at 980 ℃ in air

扫码查看
原文链接
  • 万方数据
The oxidation behavior of a novel Ni-based single-crystal 4774DD1 superalloy for industrial gas turbine applications was investigated by the isothermal oxidation at 980 ℃ and discontinuous oxidation weight gain methods.The phase constitution and morphology of surface oxides and the characteristics of the cross-section oxide film were analyzed by XRD,SEM and EDS.Results show that the oxidation kinetics of the 4774DD1 superalloy follows the cubic law,indicating its weak oxidation resistance at this temperature.As the oxidation time increases,the composition of the oxide film evolves as following:One layer consisting of a bottom Al2O3 sublayer and an upper(Al2O3+NiO)mixture sublayer after oxidized for 25 h.Then,two layers composed of an outermost small NiO discontinuous grain layer and an internal layer for 75 h.This internal layer is consisted of the bottom Al2O3 sublayer,an intermediate narrow CrTaO4 sublayer,and an upper(Al2O3+NiO)mixture sublayer.Also two layers comprising an outermost relative continuous NiO layer with large grain size and an internal layer as the oxidation time increases to 125 h.This internal layer is composed of the upper(Al2O3+NiO)mixture sublayer,an intermediate continuous(CrTaO4+NiWO4)mixture sublayer,and a bottom Al2O3 sublayer.Finally,three layers consisting of an outermost(NiAl2O4+NiCr2O4)mixture layer,an intermediate(CrTaO4+NiWO4)mixture layer,and a bottom Al2O3 layer for 200 h.

nickel-base single crystal superalloyoxidation kineticsoxide filmmicrostructuremechanism

Yu Fang、Ya-zhou Li、Qiang Yang、Qun-gong He、Xiu-fang Gong、Qian Duan、Hai-yang Song、Fu Wang、Qiong-yuan Zhang、Hong Zeng

展开 >

State Key Laboratory of Long-Life High Temperature Materials,Dongfang Turbine Co.,Ltd.,Deyang 618000,Sichuan,China

State Key Laboratory for Manufacturing System Engineering,School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,China

fund of State Key Laboratory of Longlife High Temperature MaterialsNatural Science Basic Research Plan in Shaanxi Province of ChinaChina Postdoctoral Science FoundationExcellent Youth Foundation of Shaanxi Province of ChinaBeilin district of Xi'an Science and Technology ProjectYouth Innovation Team of Shaanxi Universities

DTCC28EE2007872022JQ-5532021M6925552021JC-08GX2123

2024

10.1007/s41230-024-3088-8

中国铸造
沈阳铸造研究所

中国铸造

CSTPCDEI
影响因子：0.299
ISSN：1672-6421
年,卷(期)：2024.21(2)
  • 23