Effects of Cr on NiAl (β′) Precipitation in Ferritic Fe-Ni-Al Alloys

被引:5
作者
Ferreira-Palma, C. [1 ]
Poletti, M. C. [2 ]
Pineda-Huitron, R. M. [3 ]
Lopez-Hirata, V. M. [4 ]
Rivas-Lopez, D., I [4 ]
Dorantes-Rosales, H. J. [4 ]
机构
[1] Univ Veracruzana, Ctr Invest Micro & Nanotecnol, Boca Del Rio 94294, Mexico
[2] Graz Univ Technol, Inst Mat Sci Joining & Forming, A-8010 Graz, Austria
[3] Lulea Univ Technol, Dept Engn Sci & Math, S-97187 Lulea, Sweden
[4] UPALM, Dept Ingn Metalurgia & Mat, Inst Politucn Nacl ESIQIE, Ciudad De Mexico 07738, Mexico
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2021年 / 52卷 / 09期
关键词
MACROSCOPIC COMPOSITION GRADIENT; CREEP RESISTANCE; PHASE-DIAGRAMS; MICROSTRUCTURE; DIFFUSION; STEELS; MO;
D O I
10.1007/s11661-021-06338-x
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
NiAl (beta ')-strengthened ferritic alloys are promising candidates for high-temperature applications. They present a coherent precipitate-matrix interface and are usually alloyed with 10 wt pct Cr to improve corrosion resistance and provide solid solution strengthening. In this work, the effects of Cr content on the precipitation of beta ' in Fe-Ni-Al ferritic alloys are studied using dilatometric analysis during continuous heating and cooling. The dilatometric data are correlated with microstructural observations, X-ray diffraction, and thermodynamic calculations. Additionally, isothermally annealed diffusion couples are used for determining the beta ' phase stability during isothermal conditions. Results indicate that an increase in Cr shifts the dissolution of beta ' to higher temperatures and the Curie point to lower values. Furthermore, the coarsening rate of the beta ' phase increases with the concentration of Cr. The addition of Cr implies a tradeoff between beneficial aspects like increased corrosion resistance and extended beta ' stability range against the partial loss of coherency and a higher coarsening rate. The agreement between thermodynamic calculations and the experimental data provides a useful insight for further materials development.
引用
收藏
页码:3777 / 3787
页数:11
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