Abstract
In the manufacturing industries, heat treatment is extremely important process to achieve desirable thermo-mechanical properties of engineering materials by controlling the specific austenitizing temperature range. These desirable properties were evaluated with several conventional techniques. However, these techniques are more time-consuming, costly, and destructive in nature. To overcome the above serious inspection issues, magnetic nondestructive techniques such as Barkhausen noise (BN) and hysteresis loop (HL) were adopted for surface characterization of different heat-treated AISI 1040 steel at various austenitizing temperatures, i.e., 800, 850, and 900°C. Surface properties were evaluated in terms of microstructure, grain size, and microhardness. BN and HL responses of the heat-treated samples were reported in terms of root mean square (RMS), coercivity, HL, and BN envelope. The experimental results indicated that the drastic variation in the microstructure and microhardness of primary surface and subsurface was observed under quenching at austenitizing temperature 900°C due to rapid cooling of lath martensite, which restricts the formation of perlite. According to nondestructive evaluation, higher BN-RMS and lower coercivity were obtained in annealed samples. A linear correlation between magnetic response variables (BN-RMS and coercivity) and material properties (microhardness and grain size) was obtained at different magnetizing frequencies. Small HL and BN envelopes were found in the quenched sample because of restricted magnetic domains alignment with magnetic field under a fine lath martensite structure.
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ACKNOWLEDGMENTS
The authors would like to thank Dr. Meghanshu Vashista and Dr. Mohd Zaheer Khan Yusufzai for providing an experimental facility at Department of Mechanical Engineering, Indian Institute of Technology (BHU), Varanasi.
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Singh, S.S., Awale, A.S. & Nahak, B. Assessment the Surface Characteristics of Heat-Treated AISI 1040 Steel Using Magnetic Nondestructive Techniques. Russ J Nondestruct Test 58, 369–380 (2022). https://doi.org/10.1134/S1061830922050072
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DOI: https://doi.org/10.1134/S1061830922050072