低碳钢液相等离子体电解硼碳共渗层生长特性研究

摘要

Q235 low carbon steel was treated by plasma electrolytic borocarburizing (PEB/C) technique in borax solution with glycerinum additive.At different treatment time, the structure and morphology of borocarburizing layer on Q235 low-carbon steel were investigated.The decomposition reaction of electrolyte and the growth mechanism of boride layer in the PEB/C process were emphatically discussed.The results show that the Q235 low-carbon steel forms a compact boride layer about 20 μm thick after 30 min PEB/C treatment at 330 V.The boride layer mainly consists of Fe2B phase, and the hardness of boride layer can reach 1 800HV.The growth process of boride layer in the PEB/C process involves initial stage, the generation of island boride and the uniform growth of boride layer.%在含有硼砂和甘油的电解液中对Q235低碳钢表面进行液相等离子体电解硼碳二元共渗(PEB/C)处理,研究不同时间条件下PEB/C共渗层的组织形貌,着重探讨了PEB/C二元共渗过程中电解质的分解反应和渗硼层快速生长机理.结果表明,在330 V电压条件下,经过6 min PEB/C处理后, 在样品表面开始生成不连续的岛状硼化物;而经过30 min PEB/C处理后,可以形成主要由Fe2B相组成的均匀致密的渗硼层,渗硼层的硬度可以达到1 800HV,厚度约为20 μm.PEB/C共渗样品渗硼层的生长过程主要包括共渗初期阶段、生成岛状硼化物阶段和渗硼层均匀生长阶段.