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Effects of Laser Quenching on Impact Toughness and Fracture Morphologies of 40CrNiMo High Strength Steel

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Abstract

The surface of 40CrNiMo steel was quenched with a CO2 laser, Charpy impact test was conducted at temperatures of 20, 0, and −20 °C, and the impact absorption energies were measured. The fracture morphologies were observed with SEM, and the influence of microhardness, residual stress, and retained austenite on mechanical behavior of impact fracture after laser quenching was discussed. The results show that the hardened layer depth is more than 1 mm after laser quenching, and hardness is about 480-500 HV. The fracture morphology of the sample is dimple rupture at a temperature of 20 °C; with the lower temperature the fracture dimples become smaller. At a temperature of −20 °C, the fracture morphologies change from ductile to brittle, which is mainly cleavage fracture. The increase in surface hardness, production of compressive residual stress, and existence of retained austenite after laser quenching are the main mechanisms of increasing impact toughness.

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Acknowledgments

Financial support of this research by Jiangsu Province Science and Technology Support Program (Industry) (BE2012066) is gratefully acknowledged.

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  1. College of Mechanical Engineering, Changzhou University, Changzhou, 213016, China

    Kong Dejun & Zhang Lei

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  1. Kong Dejun
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  2. Zhang Lei
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Correspondence to Kong Dejun.

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Dejun, K., Lei, Z. Effects of Laser Quenching on Impact Toughness and Fracture Morphologies of 40CrNiMo High Strength Steel. J. of Materi Eng and Perform 23, 3695–3702 (2014). https://doi.org/10.1007/s11665-014-1164-8

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  • DOI: https://doi.org/10.1007/s11665-014-1164-8

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