Microstructure influence on creep properties of heat-resistant austenitic alloys with high aluminum content

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:783

Article

Facco, A.^1,2  Couvrat, M.²  Magne, D.¹  Roussel, M.²  Guillet, A.¹  Pareige, C.¹ 

[1] Normandie Univ, Grp Phys Mat, CNRS, INSA Rouen,UNIROUEN, F-76000 Rouen, France

[2] Manoir Ind, 12 Rue Ardennes, F-27108 Val De Reuil, France

关键词: Heat-resistant;    Alumina-forming austenitic alloy (AFA);    Precipitation;    Creep behavior;    Alloy design;    Phases diagram;   

DOI  :  10.1016/j.msea.2020.139276

来源: Elsevier

【 摘 要 】

This work focusses on the link between microstructure and creep properties for heat-resistant austenitic alloys with high aluminum content (3-5 wt %). An emphasis was put on the coupling of thermodynamic simulations, microstructural characterizations by scanning electron microscopy and transmission electron microscopy, and creep testing. The phase predictions performed by the calculation of phase diagrams method are in good agreement with the observed microstructure after creep at 1000 degrees C and 1050 degrees C. Correlation between creep properties and microstructure characterizations at 1000 degrees C and 1050 degrees C revealed that NiAl and alpha' (chromium-rich base centered cubic phase) phases are deleterious for the creep properties at service temperature. Several high Al-content alloys are selected in order to replace the chromia-forming alloys standardly used in cracking furnaces.

【 授权许可】

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