A New Precipitation-Hardened Austenitic Stainless Steel Investigated by Electron Microscopy

Austenitic super alloy steel; Precipitates; SEM; TEM; XRD

A 56Fe15Cr25Ni0.9Si0.5Mn austenitic superalloy steel was successfully synthesized from ferro-scrap, ferrochrome, ferrosilicon, and ferromanganese by using an induction furnace with a yield strength higher than that of the commercially available A-286 alloy (i.e., 430.56 MPa). 

The XRD confirmed a lattice parameter of about 3.60 Å with typical lattice planes of (111), (200), (220), (311), and (222), which extended in the interval angle of 2? between 30o and 120o. 

The microstructure of the specimen exhibited (Fe,Ni,Cr)xCy precipitation, which was distributed along the grain boundary; this can be observed in typical elongated grains and sub-grains. The results of the SEM investigation (BSE technique) of the microstructure showed that there was ferro-chromium carbide and a small amount of impurity (such as MnS).

The authors would like to express their gratitude to Mr. Gunawan, the head of the Center for Science and Technology of Advanced Material at the National Nuclear Energy Agency, for his support. The authors would also like to express their gratitude to Dr. Damar Rastri Adhika from the Research Center for Nanosciences and Nanotechnology ITB – Bandung Indonesia, for the opportunity to do the transmission electron microscopy analysis that was presented in this work. In addition, the authors would like to thank Mr. Bambang Sugeng for the XRD analysis.

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