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研究了纯铁、碳钢及低合金钢的渗硼层与基休之间形成的过渡区的组织和性能。低、中碳钢渗硼层过渡区的晶粒异常粗大，而纯铁及高碳钢的渗硼层过渡区组织无异常粗大现象。中碳钢的过渡区在紧靠硼化物层的窄小区域内有富碳现象，但整个过渡区并不富碳。渗硼过渡区的异常粗大组织主要是由于过渡区中的硼与ＡｌＮ作用后形成ＢＮ，使ＡｌＮ的阻碍奥氏体晶粒长大作用减弱而造成的。高碳钢渗硼层前沿的羽毛状组织中包含有 Ｆｅｓ（Ｃ．Ｂ）及 ＦｅＢ这两个相。
The microstructure and properties of transition zone between pure boron, carbon steel and low alloyed steel were studied. The grains of transition zone of boronizing layer of low and medium carbon steel are abnormally coarse, while the transition zone of boronizing layer of pure iron and high carbon steel is not abnormal and coarse. The transition zone of medium carbon steel has a carbon-rich phenomenon in a narrow area immediately adjacent to the boride layer, but the entire transition zone is not carbon-rich. The abnormal coarse structure in the infiltrated zone is mainly caused by the formation of BN after the action of boron and AlN in the transition zone, which makes the AlN obstruct the austenite grain growth. High-carbon steel boronizing the forefront of feather-like structure contains Fes (C.B) and FeB these two phases.