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

Qidi Wang, Shigenobu Kainuma, Shusen Zhuang, Kazuhisa Fujita, Xin Ruan
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Abstract

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/cm.
用高功率连续波激光处理 SM400A 钢的机械性能和拉伸破坏机理
本研究系统地探讨了高功率连续波激光(CWL)处理对 SM400A 钢的机械性能和失效机理的影响,并将这些结果与未经处理的试样进行了比较。研究结果表明,虽然 CWL 处理可提高表面硬度,但对厚结构钢部件的强度影响甚微。然而,过高的激光能量密度会导致表面缺陷和微观结构软化,从而对材料的韧性产生不利影响。这会导致断裂伸长率降低,使失效模式从韧性转变为脆性。研究得出结论,为确保激光处理结构的安全使用,应谨慎控制激光能量密度,不得超过 3000 焦耳/厘米。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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