Effect of Sigma Phase on Dry Sliding Wear Resistance and Surface Roughness of ASTM A890 Grade 6A Duplex Stainless Steels

  • P. Nithin RajEmail author
  • Anandu P. Sivan
  • V. Riyas
  • K. Sekar
  • M. A. Joseph
Conference paper
Part of the Lecture Notes on Multidisciplinary Industrial Engineering book series (LNMUINEN)


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.


Super 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.


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© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Mechanical Engineering DepartmentNational Institute of Technology CalicutCalicutIndia

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