Application of the DTA to the Analysis of the Residual Austenite Transformation During Tempering

  • Ignacy Wierszyllowski
  • Jerzy Rys


In quenched steel, the structure usually consists of two major components: hard, brittle and ferromagnetic martensite, and soft, ductile and paramagnetic residual austenite (RA). A proper ratio of these constituants gives required properties for machinery parts manufactured from the steel. This is a reason why the amount of residual austenite (RA) has to be known. There are several methods to determine the amount of RA, such as X-rays, quantitative metallography, magnetic analysis, dilatometry, and differential thermal analysis (DTA). The most popular are X-ray and magnetic methods, the DTA is seldom used, despite its certain advantages. Some expected advantages of DTA are: the possibility of a complex analysis of the tempering process simultaneously with a determination of the amount of RA. Moreover, it is also possible to evaluate the three following values simultaneously using the DTA curve.


Activation Energy Differential Thermal Analysis Differential Thermal Analysis Curve 100Cr6 Steel Residual Austenite 
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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • Ignacy Wierszyllowski
    • 1
  • Jerzy Rys
    • 1
  1. 1.Institute of MetallurgyPoznan Technical UniversityPoznanPoland

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