Effect of Sigma Phase on Dry Sliding Wear Resistance and Surface Roughness of ASTM A890 Grade 6A Duplex Stainless Steels
ASTM A890 grade 6A super duplex stainless steel (SDSS) is a very popular duplex steel grade. The highly alloyed steel shows precipitation of various intermediate phases at different temperature ranges and among them, sigma is the most deleterious phase. The hard sigma phase accounts for a marked increase in wear resistance. There are, however, very few studies reported on the effect of sigma phase on the roughness of the worn surface. In this work, the material was heated to three different temperatures—850, 1000, and 1100 °C—soaked for 1 hour and later quenched in water. The sigma formation was observed to be the maximum at 850 °C while no trace of sigma could be spotted at 1100 °C. The wear volume was found to be the least for specimen quenched from 850 °C and highest for the sample quenched from 1100 °C. Roughness of the specimen was found to increase in accordance with the sigma content. The sample quenched from 850 °C was noted to have the highest surface roughness.
KeywordsSuper duplex stainless steel Wear Sigma phase ASTM A890 6A
The authors wish to acknowledge Mr. B. Raha (GM, R&D, Peekay Steels (P) Ltd. Calicut) and the management and staff of Peekay Steel Castings (P) Ltd. for the support they extended toward the completion of this project.
Authors would like to sincerely thank the Department of Science and Technology (DST), Govt. of India and Centre for Precision Measurements and Nanomechanical Testing, Department of Mechanical Engineering, National Institute of Technology Calicut, for providing me the facility purchased under the scheme “Fund for Improvement of Science and Technology” (FIST—No. SR/FST/ETI-388/2015) during the period of my project work.
- 1.Charles, J., Chemelle, P.: The history and developments, nowadays DSS properties and duplex market future trends. In: Proceedings of 8th World Duplex Stainless Steel Conference, Beaune, France (2010)Google Scholar
- 5.Chowdhury, M.A., Nuruzzaman, D.M., Roy, B.K., Islam, A., Hossain, Z., Hasan, M.R.: Experimental investigation of friction coefficient and wear rate of stainless steel 202 sliding against smooth and rough stainless steel 304 counter-faces. Frict. Wear 1(3), 34–41 (2013)Google Scholar
- 6.del Abra-Arzola, J.L., García-Rentería, M.A., Cruz-Hernández, V.L., García-Guerra, J., Curiel-López, F.F.: Study of the effect of sigma phase precipitation on the sliding wear and corrosion behaviour of DSS AISI 2205. Wear 400–401, 43–51 (2018). https://doi.org/10.1016/j.wear.2017.12.019CrossRefGoogle Scholar