基体激光淬火对镀铬层界面剪切强度的影响

Effect of Laser-quenched Substrate on Interfacial Shear Strength of Chromium Plated Coatings

针对激光淬火基体后再镀铬复合工艺提高镀铬身管寿命的实际工程问题,采用多裂纹拉伸技术证明该复合镀铬工艺可以提高界面剪切强度,并从材料学角度给予解释。离子冲击技术对界面强度的定性分析表明:激光淬火基体在消除铬层和基体之间过渡层的同时也提高了界面附近材料的强度。化学腐蚀去基体法研究表明,铬层界面材料强度的提高是晶粒细化的结果。因此得出激光淬火基体提高镀铬层界面剪切强度的原因是激光淬火消除了铬层和基体之间的过渡层和增强了界面附近材料的硬度和强度。

Directing against the real working condition of Cr-plated gun bore, the laser-quenching of substrate was adopted. It was indicated by multi-cracks tensile method that the interfacial shear strength was greatly increased, its service life could be obviously improved, and the mechanism was discussed from the materials science. The interfacial strength was evaluated by ion peening technology ,the result showed that laser quenching substrate could not only eliminate interlayer between substrate and Cr-coating but also increase the strength of materials near interface. The mechanism of improving strength was due to the refined grain of Cr-coatings interface.