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Crack-Growth Behavior of Laser Surface-Alloyed Low-Carbon Steel

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Abstract

Crack-growth behavior of Nd:YAG laser surface-alloyed as-received low-carbon steel Fe360B was evaluated. Thin surface layer was alloyed with silicon carbide SiC. During laser surface alloying process SiC powder dissolved in the melted pool. The surface-alloyed layer had as-solidified structure composed mainly of dendrites of ferrite, fine martensite needles, and retained austenite. The micro-hardness of the laser surface-alloyed layer was about 850 HV0.1. In laser surface-alloyed layer compressive residual stresses of average amount of σ RS = −100 MPa were obtained. In crack-growth tests comparison between specimens of as-received low-carbon steel Fe360B and the same steel with laser-alloyed surface was made. As the crack propagation was perpendicular to the interface between the laser-alloyed layers and the base metal, laser surface-alloyed specimens exhibited higher crack-growth resistance in the low stress intensity factor range ΔK th than as-received steel specimens.

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Authors and Affiliations

  1. Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000, Ljubljana, Slovenia

    Roman Šturm, Matjaž Žnidaršič & Janez Grum

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  1. Roman Šturm
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  2. Matjaž Žnidaršič
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  3. Janez Grum
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Correspondence to Roman Šturm.

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Šturm, R., Žnidaršič, M. & Grum, J. Crack-Growth Behavior of Laser Surface-Alloyed Low-Carbon Steel. J. of Materi Eng and Perform 22, 2542–2549 (2013). https://doi.org/10.1007/s11665-013-0549-4

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  • DOI: https://doi.org/10.1007/s11665-013-0549-4

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