Mechanical properties and tensile failure mechanisms of SM400A steel treated by high-power continuous-wave laser

This study systematically investigates the effects of high-power continuous wave laser (CWL) treatment on the mechanical behavior and failure mechanisms of SM400A steel, comparing these outcomes with those of untreated specimens. The findings reveal that while CWL treatment enhances surface hardness...

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Bibliographic Details
Published inJournal of materials research and technology Vol. 32; pp. 4293 - 4303
Main Authors Wang, Qidi, Kainuma, Shigenobu, Zhuang, Shusen, Fujita, Kazuhisa, Ruan, Xin
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2024
Elsevier
Subjects
Continuous wave laser
Failure mechanism
Mechanical properties
Tensile test
Failure mechanism
Mechanical properties
Tensile test
Continuous wave laser
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Summary:This study systematically investigates the effects of high-power continuous wave laser (CWL) treatment on the mechanical behavior and failure mechanisms of SM400A steel, comparing these outcomes with those of untreated specimens. The findings reveal that while CWL treatment enhances surface hardness, it has minimal impact on the strength of thick structural steel components. However, excessive laser energy density leads to surface defects and softening of the microstructure, adversely affecting the material's toughness. This results in a reduction in elongation at fracture, transitioning the failure mode from ductile to brittle. The study concludes that to ensure the safe use of laser-treated structures, the laser energy density should be carefully controlled not to exceed 3000 J/cm2.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2024.09.001