等离子堆焊原位合成WC增强Ni基合金改性层

发布时间：2018-01-24 00:05

本文关键词： 等离子堆焊原位合成 Ni基合金显微组织成分氧化钇显微硬度摩擦磨损　出处：《沈阳工业大学学报》2015年03期 　论文类型：期刊论文

【摘要】：为了进一步提高Ni基合金的耐磨性能,采用等离子堆焊技术在304L奥氏体不锈钢表面原位合成WC增强Ni基合金改性层.利用光学显微镜、扫描电子显微镜和能谱仪、X射线衍射仪、显微硬度计及销-盘磨损试验机等设备对改性层的显微组织、成分、显微硬度及摩擦磨损性能进行研究.结果表明:当Ni基合金改性层中直接加入WC颗粒时,WC颗粒出现"沉底"现象,改性层组织不均匀,而通过原位反应合成的WC相呈块状弥散分布于整个改性层,加入适量的氧化钇后,改性层组织变得细小致密,WC增强相的形态、尺寸和分布等均发生了变化,改性层硬度显著提高,耐磨性提高了2倍以上.
[Abstract]:In order to further improve the wear resistance of Ni-based alloy, WC reinforced Ni-base alloy modified layer was synthesized on 304L austenitic stainless steel surface by plasma surfacing technology. Scanning electron microscope and energy spectrometer X-ray diffractometer, microhardness tester and pin-disk wear tester, etc., for the microstructure and composition of the modified layer. The microhardness and friction and wear properties were studied. The results showed that when WC particles were added directly into the modified layer, the "bottom" phenomenon of WC particles appeared and the microstructure of the modified layer was not uniform. The WC phase synthesized by in-situ reaction distributed in bulk in the whole modified layer. After adding appropriate amount of yttrium oxide, the microstructure of the modified layer became fine and compact. The size and distribution of the modified layer were changed, the hardness and wear resistance of the modified layer were improved significantly and the wear resistance of the modified layer was increased by more than 2 times.
【作者单位】：沈阳工业大学材料科学与工程学院;沈阳鼓风机集团核电泵业有限公司;
【基金】：国家自然科学基金资助项目(51271126) 辽宁省自然科学基金资助项目(2013020101) 沈阳市科技局计划资助项目(F13-318-1-52,F13-070-2-00)
【分类号】：TG455
【正文快照】： 粉末等离子堆焊作为材料表面强化技术之一,具有能堆焊各种合金粉末、堆焊层组织致密、稀释率低、合金材料消耗少、生产效率高、成本低、易于实现自动化等诸多优点,且堆焊获得的亚稳态合金以其优异的耐磨性、耐蚀性及耐热性日益引起人们的关注[1-4].颗粒增强金属基复合材料(MMC

【参考文献】