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Microstructures of Cast Fe-Mn-Si-Cr-Ni Shape Memory Alloys Characterized by Metallography

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Published/Copyright: February 15, 2014
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Practical Metallography
From the journal Practical Metallography Volume 51 Issue 2

Abstract

In the present paper, we selected or designed several etchants to characterize the solidification modes, the distribution of micro-segregation and the grain morphology of cast Fe-Mn-Si-Cr-Ni SMAs solidifying as A, AF, FA and F modes based on the principle of metallography. The results showed that a tint etchant based on 0.5 g K2S2O5, 20 g NH4HF2 and 100 ml H2O can only characterize the grain morphology of cast Fe-Mn-Si-Cr-Ni SMAs solidifying as F and FA modes and can reveal the typical microstructures of FA, AF and A modes. An ordinary etchant (1 ml HF, 15 ml H2O2, 1 g C2H2O4 and 15 ml H2O) can only reveal the typical microstructures of F mode. As a result, the solidification modes of cast Fe-Mn-Si-Cr-Ni SMAs are determined by using both tint etchants together. Another tint etchant (20 g K2S2O5, 1 g NH4HF2 and 100 ml H2O) can qualitatively characterize the distribution of micro-segregation in cast Fe-Mn-Si-Cr-Ni SMAs with four solidification modes.

Kurzfassung

In vorliegender Arbeit wählten wir verschiedene Ätzmittel aus oder stellten solche zusammen, um die Erstarrungsmodi, die Verteilung der Mikroseigerung und die Kornmorphologie von Fe-Mn-Si-Cr-Ni-Guss-FGLs (FGL, Formgedächtnislegierung), die in den Modi A, AF, FA und F erstarren, nach den Grundsätzen der Metallographie zu charakterisieren. Die Ergebnisse zeigten, dass ein sich aus 0,5 g K2S2O5, 20 g NH4HF2 und 100 ml H2O zusammensetzendes Farbätzmittel lediglich zur Beschreibung der Kornmorphologie der in den Modi F und FA erstarrenden Fe-Mn-Si-Cr-Ni-Guss-FGLs herangezogen werden und die typischen Mikrostrukturen der FA-, AF- und A-Modi freilegen kann. Ein herkömmliches Ätzmittel (1 ml HF, 15 ml H2O2, 1 g C2H2O4 und 15 ml H2O) kann lediglich die typischen Mikrostrukturen des F-Modus offenlegen. Demzufolge werden die Erstarrungsmodi von Fe-Mn-Si-Cr-Ni-Guss-FGLs unter dem gemeinsamen Einsatz beider Farbätzmittel bestimmt. Ein anderes Farbätzmittel (20 g K2S2O5, 1 g NH4HF2 und 100 ml H2O) ermöglicht die qualitative Charakterisierung der Verteilung der Mikroseigerung in Fe-Mn-Si-Cr-Ni-Guss-FGLs mit vier Erstarrungsmodi.

Übersetzung: E. Engert

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Received: 2013-12-03
Accepted: 2014-01-21
Published Online: 2014-02-15
Published in Print: 2014-02-17

© 2014, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Stereological Analysis of the Microstructural Inhomogeneities in Direct-Chill Cast and Continuous-Cast Aluminium-Magnesium Alloy (AA5754)
  7. The Investigation and Growth Kinetics of TiC Coatings on AISI D3 Steel Produced by Thermo-Reactive Diffusion Technique
  8. Microstructures of Cast Fe-Mn-Si-Cr-Ni Shape Memory Alloys Characterized by Metallography
  9. Materialographic Examination of Three Different Types of Failed Dental Implants
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
https://doi.org/10.3139/147.110274

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Stereological Analysis of the Microstructural Inhomogeneities in Direct-Chill Cast and Continuous-Cast Aluminium-Magnesium Alloy (AA5754)
  7. The Investigation and Growth Kinetics of TiC Coatings on AISI D3 Steel Produced by Thermo-Reactive Diffusion Technique
  8. Microstructures of Cast Fe-Mn-Si-Cr-Ni Shape Memory Alloys Characterized by Metallography
  9. Materialographic Examination of Three Different Types of Failed Dental Implants
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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