CAJ | 학술논문

为研究合金在连续激光辐照过程中反射率变化机理，建立了积分球反射率测量装置，测量了1.06μm连续激光辐照过程中45号钢反射率变化。实验结果表明，激光辐照过程中反射率先快速下降，然后产生周期波动。随着激光功率增大，反射率开始下降点和最小值点对应温度逐渐升高，极大值个数增多。建立了多层氧化膜影响模型，结合氧化膜生长规律，分析了不同结构、不同厚度变化规律氧化膜层的反射率特征，实验结果验证了理论模型的合理性。结果表明，反射率变化主要原因是氧化膜生长引起的多光束干涉与吸收效应。由FeO-Fe3O4-Fe2O3组成的三层氧化膜中，中间吸收型Fe3O4膜是反射率变化的主要影响因素，最外层Fe2O3膜引起的干涉效应影响反射率的稳定值，最内层FeO膜的贡献可以忽略。
위연구합금재련속격광복조과정중반사솔변화궤리，건립료적분구반사솔측량장치，측량료1.06μm련속격광복조과정중45호강반사솔변화。실험결과표명，격광복조과정중반사솔선쾌속하강，연후산생주기파동。수착격광공솔증대，반사솔개시하강점화최소치점대응온도축점승고，겁대치개수증다。건립료다층양화막영향모형，결합양화막생장규률，분석료불동결구、불동후도변화규률양화막층적반사솔특정，실험결과험증료이론모형적합이성。결과표명，반사솔변화주요원인시양화막생장인기적다광속간섭여흡수효응。유FeO-Fe3O4-Fe2O3조성적삼층양화막중，중간흡수형Fe3O4막시반사솔변화적주요영향인소，최외층Fe2O3막인기적간섭효응영향반사솔적은정치，최내층FeO막적공헌가이홀략。
To study the reflectivity character of alloy steel under CW-laser irradiation, the integrating sphere reflectometer was setup to measure the reflectance and temperature of 45# steel in -situ. Experimental results show that the reflectance dropped dramatically first, and then fluctuate periodically. The amplitude decreases and the period increases with time. With the increase of laser power, the temperature correspond to the begin point of decline and minimum point increases too. The number of maximum value is increased, the maximum value is increased one by one instead of decreased. A multilayer oxide films affection theory model was built. Combining with the model and oxide film growth mechanism of 45# steel, the reflectance was calculated at different oxide film structure and thickness ratio. The comparison between simulation and experimental results shows that the theory is reasonable. The study indicates that the multi-beam interference effects and absorb effects induced by oxide film growth are main reason of the reflectance evolution. In three layers of FeO-Fe3O4-Fe2O3, the absorbing Fe3O4 film is the dominant layer, the outer film Fe2O3 can cause multi-beam interference, and the inner FeO film hardly has contribution to reflectance.