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渗硼零件表面具有很高的硬度和耐磨性,良好的抗蚀性,红硬性和抗氧化性,因而受到国内外广泛的重视。近年来,渗硼理论及工艺研究取得了很大的进展,渗硼处理己广泛地应用于许多工业部门,并且在提高易损零件使用寿命和延长工模具服役时间等方面收到了显著的效果。一般说硼化物相是很脆的,但当考虑到硼化物呈针状嵌入基体的结构,并将其和基体看作一个整体,则渗硼层的脆性就不像单一的金属间化合物那么严重了。例如渗硼层的平均厚度为0.15～0.20mm,试样可延伸4%而不出现裂纹。然而对那些渗硼层针状结构不甚明显,并用作承受冲击重载的合金模具钢,降低渗硼层的脆性,增加表面强化层的深度,时提高模具使用寿命是有益的。为此就利用激光处理改变5CrNiMo 钢渗硼层组织从而改善其脆性和提高表面强化效果进行了探索性研究.
Boride parts surface has a high hardness and wear resistance, good corrosion resistance, red hardness and oxidation resistance, which attracted widespread attention at home and abroad. In recent years, great progress has been made in boronizing theory and technology research. Boronizing treatment has been widely used in many industrial sectors and has received remarkable results in improving the service life of wearing parts and extending the service life of tooling. In general, the boride phase is very brittle, but the brittleness of the boronizing layer is less severe than that of a single intermetallic compound, considering the structure in which the boride is acicularly embedded in the matrix and is considered as a whole with the matrix It’s For example, the average thickness of boronized layer is 0.15 ~ 0.20mm, the sample can extend 4% without cracking. However, for those boron-impregnated needle-like structure is not obvious, and used to withstand the impact of heavy-duty alloy die steel, boronizing layer to reduce the brittleness, increase the depth of the surface strengthening layer, improve the service life of the mold is beneficial. To this end the use of laser treatment to change 5CrNiMo steel boronized layer to improve its brittleness and improve the surface strengthening effect of exploratory research.