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首页> 外文期刊>Materials Research >Mechanical and Metallurgical Characterization of Laser Welding on P91 Ferritic Steel and Incoloy 800HT Dissimilar Joints
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Mechanical and Metallurgical Characterization of Laser Welding on P91 Ferritic Steel and Incoloy 800HT Dissimilar Joints

机译：P91铁素体钢和Incoloy 800HT异种接头上的激光焊接的机械和冶金特性

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摘要

In this work, microstructural characterization and mechanical properties of P91 and Incoloy 800HT dissimilar laser beam welded joint were analyzed. In addition to that, metallographical studies were conducted using Optical microscopy, Scanning electron microscopy (SEM) equipped with Energy-dispersive X-ray spectroscopy (EDX) and X-Ray diffraction analysis (XRD). Effect of specific point energy on weld microstructure was predicted and it was compared with fusion zone hardness. The δ-ferrite content of the welds was predicted and it was correlated with the results measured by ferritoscope. Increase in heat input led to a minimal increase in the weld bead width and also the depth of penetration as predicted by microstructural studies. The traces of δ-ferrite in the interface of P91 side led to higher strength and microhardness of the weld. Failure of tensile specimens in the HAZ of Incoloy 800HT side was because of lower ferrite content (0 to 0.36) in that region and also due to the presence of the brittle intermetallic phases. The tensile strength of higher specific point energy welds was greater compared to other welds because of precipitation hardening and presence of δ-ferrite. Fractography results of fracture surfaces contain uniform dimples which showed that the failure took place in a ductile mode.
机译：在这项工作中，分析了P91和Incoloy 800HT异种激光束焊接接头的显微组织特征和力学性能。除此之外，使用配备有能量色散X射线光谱法（EDX）和X射线衍射分析（XRD）的光学显微镜，扫描电子显微镜（SEM）进行金相研究。预测了点能量对焊缝组织的影响，并将其与熔合区硬度进行了比较。可以预测焊缝中的δ-铁素体含量，并将其与铁素体仪测量的结果相关联。热量输入的增加导致焊缝宽度的最小增加以及微结构研究预测的熔深。在P91侧的界面中出现了δ铁素体痕迹，从而提高了焊缝的强度和显微硬度。 Incoloy 800HT侧的热影响区中拉伸试样的失败是由于该区域中较低的铁素体含量（0至0.36），也归因于存在脆性金属间相。由于析出硬化和δ-铁素体的存在，比能量更高的点焊缝的抗拉强度比其他焊缝大。断裂表面的断口扫描结果包含均匀的凹坑，表明破坏是以延性模式发生的。

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