预变形对碳钢渗硼组织的影响

Influence of pre -deformation on boronized layer in carbon steels

低碳钢（０． ２０％ Ｃ）渗硼后获得由 ＦｅＢ层和 Ｆｅ２Ｂ层组成的硼化物层；高碳钢（１．０％ Ｃ）渗硼后则获得几乎由单－ Ｆｅ２Ｂ层组成的硼化物层．而中碳钢（０． ４５％ Ｃ）的硼化物层则由若干个 ＦｅＢ层和Ｆｅ２Ｂ层组成的亚层所构成．预变形可使低、中碳钢的硼化物层减薄，尤其当预变形量较小（２０％）或较大（６０％）时；而对于高碳钢，预变形则使其增厚，特别在中等变形量（４０％）时．

In low - carbon steel(0. 20% C), boronized layer is composed of FeB layer and Fe2B layer. In high - carbon steel (1. 0% C), boronned layer is composed of Fe2B layer. But in medium carbon steel (0. 45% C), it consists of several sub -layers, each of which is also composed of FeB layer and Fe2B layer. Pre - deformation reduce boronned layer depth in both low and medium steels (especially at 20% and 60% strain) and increases boronized layer depth in high carbon steel(especially at 40% strain).