Effect of Temperature and Microstructure on the Corrosion Behaviour of a Low Carbon Dual Phase Steel
Journal Title: American journal of Engineering Research - Year 2017, Vol 6, Issue 5
Abstract
This work assesses the impact of intercritical annealing temperature and microstructure on the corrosion performance of duplex microstructure steel developed from 0.23%C steel in 0.1M HCl solution. After normalizing, the duplex microstructure was developed through intercritical annealing heat treatment at 730OC, 750OC, 770OC and 790OC respectively for 30minutes.and quenched in water. Samples for microscopic examination and corrosion rate measurements were prepared. Optical microscope was used to examine the microstructures. The point count method using stereology was used to evaluate the martensite volume fraction in the developed duplex structure. Weight loss method was used to determine the corrosion rate of the samples in 0.1M HCl. Results obtained showed that the microstructure of the normalized sample was characterized by the presence of alternate layers of pearlite and ferrite, while that of the intercritical annealed samples revealed the presence of dispersed martensite in a ferrite matrix. It was equally observed that the relative amount of martensite in the developed duplex structure increased with increase in annealing temperature. Corrosion rate of the developed dual phase steels was slightly higher than that of the dual phase steel, whereas the corrosion rate of the dual phase steels increased as a function of martensite volume fraction.
Authors and Affiliations
S. C. Ikpeseni1,2, E.S. Ameh2,3
Keywords
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