FeSiB非晶薄带激光焊接头组织及晶化行为

发布时间：2018-07-15 07:07

【摘要】：采用脉冲激光焊接技术成功实现FeSiB非晶带材的搭接,并通过热处理方法分析接头晶化行为。利用扫描电子显微镜SEM、X射线衍射仪XRD、差示扫描热仪DSC和透射电镜TEM等研究不同功率对激光焊缝成形、组织特征及晶化行为的影响。结果表明:当功率低于4.8 W时,焊缝表面粗糙、熔宽小;当功率高于9.6 W时,焊缝存在微裂纹;当功率为7.2W时,焊缝成形良好,未见焊接缺陷。随着功率的增加,接头抗拉强度先升高后降低,最高拉伸强度为410 MPa,断裂方式为解理断裂;接头组织主要由非晶相、树枝晶、白色颗粒状的结晶相组成;接头晶化过程中先析出α-Fe(Si)相,再析出Fe_2B相。
[Abstract]:The splicing of FeSiB amorphous strip was successfully realized by pulsed laser welding, and the crystallization behavior of the joint was analyzed by heat treatment. The effects of different power on laser weld formation, microstructure and crystallization behavior were studied by means of scanning electron microscope (SEM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The results show that when the power is lower than 4.8 W, the weld surface is rough and the weld width is small; when the power is higher than 9.6 W, there is a microcrack in the weld, and when the power is 7.2 W, the weld is well formed and no welding defects are found. With the increase of power, the tensile strength of the joint first increases and then decreases, the highest tensile strength is 410 MPA, the fracture mode is cleavage fracture, the microstructure of the joint is mainly composed of amorphous phase, dendritic phase and white granular crystalline phase. The 伪 -Fe (Si) phase was precipitated first and then Fe2B phase was precipitated during the crystallization of the joint.
【作者单位】：南昌航空大学轻合金加工科学与技术国防重点学科实验室;北京科技大学新金属材料国家重点实验室;
【基金】：国家自然科学基金资助项目(51461031) 江西省教育厅基金资助项目(GJJ150733);江西省教育厅科技落地计划资助项目(KJLD14055) 江西省科技厅科技合作项目(20161BBH80031) 北京市自然科学基金资助项目(2142022)~~
【分类号】：TG456.7

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