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首页> 外文会议>International Conference on Sheet Metal >Microstructural Evolution and Tensile Strength of Laser-Welded Butt Joints of Ultra-High Strength Steels: Low and High Alloy Steels
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Microstructural Evolution and Tensile Strength of Laser-Welded Butt Joints of Ultra-High Strength Steels: Low and High Alloy Steels

机译：超高强度钢激光焊接对接接头的微观结构演化与拉伸强度：低合金钢和高合金钢

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摘要

The present study is focused on joining two ultra-high strength steels plates of 3 mm thickness using laser-welding. Abrasion resistant steel with martensitic structure, tensile strength (Rm) ≥ 2 GPa, and cold-deformed austenitic stainless steel, Rm 1.3 GPa, were used for the dissimilar butt joints. Two different laser energy inputs, 160 and 320 J/mm, were presented during welding. The weld morphology and microstructural evolution of the fusion zone were recorded using optical microscopy and electron back scattering diffraction (EBSD), respectively. The mechanical properties of the dissimilar joints were evaluated by hardness measurements and tensile tests. It was found that fusion zone has undergone a change in morphology and microstructure during welding depending upon the energy input. Analysis of the microstructural evolution in the fusion zone by EBSD examination showed that the presence of a mixture of small austenite grains in a matrix of martensite. The changes in hardness profiles and tensile strength under the experimental parameters were further reported.
机译：本研究专注于使用激光焊接连接两个超高强度钢板3mm厚的厚度。用马氏体结构的耐磨钢，拉伸强度（RM）≥2GPa和冷变形奥氏体不锈钢RM 1.3 GPA，用于不同的对接接头。在焊接期间提出了两个不同的激光能量输入，160和320 j / mm。使用光学显微镜和电子背散射衍射（EBSD）记录融合区的焊接形态和微观结构演化。通过硬度测量和拉伸试验评估不同关节的机械性能。发现融合区根据能量输入焊接期间经历了形态和微观结构的变化。 EBSD检查融合区微观结构演化的分析表明，马氏体基质中存在小奥氏体颗粒的混合物。还报道了实验参数下硬度谱和拉伸强度的变化。

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