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Microhardness Characterization of Fe- and Co-Based Superalloys

  • Ibrahim Karaca
  • Selva Büyükakkas
Research Paper

Abstract

The reverse indentation load-size effects of Fe–Mn–Si and Co–Mn–Si superalloy have been investigated by measuring Vickers hardness. The characterized superalloy samples are presented in the reverse indentation load-size effects, which is known as the microhardness increases with increasing applied load behavior. The theoretical model is rearranged and investigated according to the reverse indentation load-size effects using reconstituted Meyer law, proportional specimen resistance model, and modified proportional specimen resistance model. The reconstituted modified proportional specimen resistance model is highly suitable for describing the data of the Fe–Mn–Si and Co–Mn–Si alloys. SEM micrographs show that Co-based alloys exhibited a dendritic microstructure and Fe-based alloys were presented austenitic microstructure. In this study, the load range from 0.49 to 9.8 N was applied to the materials, but no crack is observed on the surface of the material. This can only be attributed to the occurrence of the elastic deformation which yields reverse indentation size effect in these samples.

Keywords

Superalloy SEM Microhardness Reverse indentation size effects (RISE) Fe–Mn–Si Co–Mn–Si 

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Copyright information

© Shiraz University 2018

Authors and Affiliations

  1. 1.Department of Physic, Faculty of Arts and ScienceNiğde Ömer Halisdemir UniversityNigdeTurkey

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