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Metallurgical and Materials Transactions A

, Volume 49, Issue 10, pp 4474–4483 | Cite as

Martensite Transformation During Continuous Cooling: Analysis of Dilatation Data

  • Ravi Ranjan
  • Shiv Brat Singh
Article
  • 257 Downloads

Abstract

The amount of athermal martensite as a function of undercooling below the martensite start temperature was quantified by analyzing the dilatation data using a novel method, and the results are compared with existing empirical equations. The discrepancy between the two results was attributed to the difference in the concentration ranges of the alloying elements considered. The importance of including the effect of substitutional elements on the lattice parameters of martensite for accurate quantitative interpretation of dilatation data was highlighted. Equations that include the effect of substitutional alloying elements were proposed to calculate martensite lattice parameters. It is further shown that it is possible to calculate the lattice parameter coefficient of a substitutional alloying element directly from the dilatation curve. It was used to estimate, for the first time, the lattice parameter coefficient of aluminum (Al) in ferrite/martensite from the dilatation curves of the two alloy steels studied in the current work. To corroborate the value of the lattice parameter coefficient of Al estimated from the dilatation data, the Bain model was also used to calculate the lattice parameter coefficient of Al independently and a good match was obtained. The lattice parameter coefficient value of Al in ferrite/martensite calculated by both these methods follows the overall trend shown by other substitutional alloying elements. The equations proposed for the lattice parameters of martensite were validated by Rietveld analysis of the X-ray diffraction (XRD) patterns.

Notes

Acknowledgments

The authors gratefully acknowledge the head of the Department of Metallurgical and Materials Engineering, the Indian Institute of Technology Kharagpur (Kharagpur, India), for providing the laboratory facility. The authors also thank the Ministry of Steel and Department of Science and Technology, Government of India, for partial financial support. The authors thank Prof. H. K. D. H. Bhadeshia, University of Cambridge, UK, and Prof. S. Banerjee, Former Chairman, Atomic Energy Commission, India and distinguished Professor, IIT Kharagpur, for helpful discussions.

Supplementary material

11661_2018_4754_MOESM1_ESM.pdf (336 kb)
Supplementary material 1 (PDF 337 kb)
11661_2018_4754_MOESM2_ESM.pdf (263 kb)
Supplementary material 2 (PDF 264 kb)

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  1. 1.Department of Metallurgical and Materials EngineeringIndian Institute of Technology KharagpurKharagpurIndia

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