钴基高温合金的激光成型性能研究

发布时间：2018-01-18 09:44

本文关键词：钴基高温合金的激光成型性能研究　出处：《稀有金属》2017年04期 　论文类型：期刊论文

【摘要】：采用光纤激光器和同步送粉激光成型工艺技术,实验时通氩气进行真空保护,通过一定的激光工艺参数(激光功率1800 W,扫描速度5 mm·s~(-1),送粉速度18 g·min~(-1),光斑直径3 mm)在45号钢基板上成功获得钴基高温合金块体样品。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和能量分散谱(EDS)分析以及室温拉伸和耐磨实验研究钴基合金的激光成型件性能。结果表明钴基高温合金与基体之间形成良好的冶金结合,激光成型后的微观组织多为均匀细小的枝晶,由于存在重熔区,使得部分枝晶发生粗化现象,但无明显缺陷,主要由M_6C,Cr_(23)C_6,Cr Co金属间化合物和γ-Co基体相组成;成型件样品的拉伸断裂断口平整,无颈缩现象,属于脆性断裂,其断裂过程是韧窝-类解理的复合断裂;成型件样品磨损表面存在犁沟磨痕,磨损前后质量损失很小,耐磨性能优良,耐磨机制主要是磨粒磨损、黏着磨损、氧化磨损。
[Abstract]:Using optical fiber laser and synchronous powder feeding laser forming technology, the experiment of argon vacuum protection, through certain laser parameters (laser power of 1800 W, scanning speed 5 mm s~ (-1), powder feeding rate of 18 g - min~ (-1), spot diameter 3 mm) successfully obtained cobalt base superalloy the bulk samples on 45 steel substrate. By means of X ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) laser molding performance analysis and experimental study on tensile and wear resistance of cobalt based alloy. The results show that a good metallurgical bond between cobalt base superalloy and coating, microstructure the microstructure of laser after molding is uniform and fine dendrite, due to the presence of remelting zone, so that part of the dendrite coarsening phenomenon, but without obvious defects, mainly composed of M_6C, Cr_ (23) C_6, Cr Co intermetallic compounds and gamma -Co based bulk composition; stretch forming specimen broken Fracture formation, no necking, belong to brittle fracture, the fracture process is complex fracture dimple like cleavage; molding the worn surfaces of the samples are furrow grinding, after the wear mass loss is very small, excellent wear resistance, wear mechanism is mainly abrasive wear, adhesive wear and oxidation wear.

【作者单位】：沈阳航空航天大学机电工程学院;中国科学院金属研究所高温合金研究部;
【基金】：国家自然科学基金项目(51371173) 辽宁省自然科学基金项目(2013024011)资助
【分类号】：TG146.16
【正文快照】： 沈阳110016)Co Cr W(钴铬钨合金)是司太立(Stellite)合金的一种,具有高硬度、良好的抗热疲劳、抗热腐蚀、耐磨蚀和焊接性,广泛应用于航空、航天、石油、化工、船舶等行业[1-8]。钴基合金粉在激光作用下熔化时具有良好的润滑性,可获得致密性好和表面光滑平整的熔覆层,为激光成

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