ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 12 August 2008
Page Count: 7

Comparison of Thermal Expansion Behavior of Phosphoric Irons with Conventional Concrete Reinforcement Steel

Sahoo, Gadadhar
Former Doctoral Studentis Assistant Manager, Department of Materials and Metallurgical Engineering, Indian Institute of TechnologyR&D Center for Iron and Steel, Steel Authority of India Limited, Ranchi,

Balasubramaniam, R.
Professor, Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur,

Mungole, M. N.
Principal Research Engineer, Department of Materials and Metallurgical Engineering, Institute of Technology, Kanpur,

(Received 18 February 2008; accepted 11 July 2008)

Abstract

Phase transformations using dilatometry and microstructures in two phosphoric irons (Fe-0.11P-0.028C, Fe-0.49P-0.022C) and a low carbon steel (Fe-0.148C-0.542Mn–0.128Si), all in weight percent, were studied. The linear thermal expansion coefficients of phosphoric irons was comparable to that of carbon steel. The phase transformation temperatures were not well defined in the case of phosphoric irons. While low-phosphorus steel exhibited single-phase microstructure, high-phosphorus steel exhibited dual-phase ferritic microstructure consisting of prior ferrite and prior austenite. The low carbon steel revealed a ferrite-pearlite microstructure at the center of the cross section and tempered martensite at the rim.

Keywords:
dilatometry, phosphoric irons, linear thermal expansion coefficient, phase transformation, microstructure

Paper ID: JAI101708
DOI: 10.1520/JAI101708
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