The Elevated Temperature Wear Analysis of Laser Surface–Hardened EN25 Steel Using Response Surface Methodology

Abstract

The wear behavior of as-received and laser-hardened EN25 low-alloy steel is performed in dry sliding condition using a pin-on-disc-type machine. A response surface methodology–based Box-Behnken design is used to design the experimental matrix by reducing the number of experimental conditions and to develop mathematical models between the key process parameters. The process parameters considered are applied load, temperature, and sliding distance and the responses are wear rate and coefficient of friction. Analysis of variance is used to analyze the developed model. Laser surface–hardened samples exhibit a lower wear rate (0.099 × 10³to 0.490 × 10³mm³/m) and coefficient of friction (0.080 to 0.245 μ) compared to as-received samples.

KEY WORDS:

• Laser Surface Hardenin
• Elevated Temperature Sliding Wear
• Response Surface Methodology
• Coefficient of Friction
• Oxidational Wear

ACKNOWLEDGEMENTS

The Head and Management of the Welding Research Institute, Bharat Heavy Electricals Limited, Tiruchirappalli, and National Institute of Technology Tiruchirappalli are gratefully acknowledged for their experimental support of this research work. The authors are also grateful SASTRA University, Thanjavur, for their support in carrying out the analyses.