Effect of Laser Quenching on Tensile Properties and Fracture Analysis of 40CrNiMo High Strength Steel

KONG De-jun;ZHANG Lei;FU Gui-zhong

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  • Sponsored by: China Association for Science and Technology (CAST)

    Editor-In-Chief: Xu Yida

    ISSN 1000-1093

    　

  • Hosted By: China Ordnance Society

    Published By: Acta Armamentarii

    CN 11-2176/TJ

Acta Armamentarii, a Chinese monthly journal, was first published in 1979. The journal is supervised by China Association for Science and Technology, sponsored by China Ordnance Society，and edited and published by Editorial Board of Acta Armamentarii. The Journal is included in all important domestic databases，and also collected by Engineering Index (EI, USA), Chemical Abstracts (CA, USA), Science Abstracts (SA, UK）, Abstract Journal (AJ, Russia), and Current Bibliography on Science and Technology(CBST).Acta Armamentarii has been selected into the journal Of Ordnance Science and Technology (Weapons Industry) Field Of High Quality Scientific and Technological Periodical Classification Catalogue (2022 edition), ranking T1, and the journal of Automotive Engineering Field of High Quality Scientific and technological Periodical classification Catalogue, ranking T2.
Acta Armamentarii ›› 2014, Vol. 35 ›› Issue (7) : 996-1002. DOI: 10.3969/j.issn.1000-1093.2014.07.009
Paper

Effect of Laser Quenching on Tensile Properties and Fracture Analysis of 40CrNiMo High Strength Steel

  • KONG De-jun1, 2, ZHANG Lei1, FU Gui-zhong1
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Abstract

The surface of 40CrNiMo high strength steel is treated with CO2 laser, the effect of laser quenching on tensile property of the sample is investigated through the tensile comparative test, and the fracture morphologies of 40CrNiMo before and after surface laser quenching are analyzed by scanning electron microscope and energy dispersive spectrometer, respectively. The results show that the yield strength, tensile strength and elongation of 40CrNiMo steel after laser quenching are increased by 25.3%, 24.4% and 7.1%, respectively, while the section shrinkage is decreased by 7.6%. 40CrNiMo steel has obvious yield stage after laser quenching, showing a continuous yield feature. Compared with the primitive sample, the yield strength and tensile strength of 40CrNiMo steel after laser quenching increase, but there are no obvious improvements in the tensile failure mode and the delamination, and the quasi cleavage morphology and low porosity appear at the fracture near the surface of the sample after laser quenching.

Key words

basic disciplines of materials science / laser quenching / 40CrNiMo / tensile property / material fracture / fracture morphology

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KONG De-jun, ZHANG Lei, FU Gui-zhong. Effect of Laser Quenching on Tensile Properties and Fracture Analysis of 40CrNiMo High Strength Steel. Acta Armamentarii. 2014, 35(7): 996-1002 https://doi.org/10.3969/j.issn.1000-1093.2014.07.009

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