EFFECT OF HEAT INPUT AND POST-WELD HEAT TREATMENT ON THE MECHANICAL AND METALLURGICAL CHARACTERISTICS OF LASER-WELDED MARAGING STEEL JOINTS

R. Karthikeyan, M. Saravanan, B. Singaravel and P. Sathiya
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R. Karthikeyan: Department of Mechanical Engineering, Kurinji College of Engineering and Technology, Manapparai Tiruchirappalli 621307, Tamil Nadu, India
M. Saravanan: #x2020;Department of Mechanical Engineering, SSM Institute of Engineering and Technology, Dindigul 624002, Tamil Nadu, India
B. Singaravel: #x2021;Department of Mechanical Engineering, Vignan Institute of Technology and Science, Hyderabad 508284, Telangana, India
P. Sathiya: #xA7;Department of Production Engineering, National Institute of Technology Tiruchirappalli, Tiruchirappalli 620015, Tamil Nadu, India

Surface Review and Letters (SRL), 2017, vol. 24, issue 07, 1-13

Abstract: This paper investigates the impact of heat input and post-weld aging behavior at different temperatures on the laser paper welded maraging steel grade 250. Three different levels of heat inputs were chosen and CO2 laser welding was performed. Aging was done at six different temperatures: 360∘C, 400∘C, 440∘C, 480∘C, 520∘C and 560∘C. The macrostructure and microstructure of the fusion zone were obtained using optical microscope. The microhardness test was performed on the weld zone. Tensile tests and impact tests were carried out for the weld samples and different age-treated weld samples. Fracture surfaces were investigated by scanning electron microscopy (SEM). Microhardness values of the fusion zone increased with increasing aging temperature, while the base metal microhardness value decreased. Tensile properties increased with aging temperature up to 480∘C and reduced for 520∘C and 560∘C. This was mainly due to the formation of reverted austenite beyond 500∘C. XRD analysis confirmed the formation of reverted austenite.

Keywords: Maraging steel; laser welding; aging; reverted austenite; microstructure (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17501025

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