【作者】 魏学勤； 郑启光； 辜建辉； 李再光；

【Author】 WEI XUE-QIN ZHENG QI-GUANG GU JIAN-HUI LI ZAI-GUANG (State key. Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074)

【机构】 华中理工大学激光技术国家重点实验室；

【摘要】 研究了在连续CO₂激光辐照下不锈钢表面的温度涨落特性。实验中用国产HWRX-Ⅲ型红外快速热像仪测量了不锈钢表面的升温过程及温度涨落。发现不锈钢在激光辐照下随辐照时间的增加和温度的升高,其温度涨落的幅度基本保持不变,这与理论预言不符,也不同于已研究过的铝、低碳钢、环氧树脂和有机玻璃等材料。随辐照时闻的增加,温度的升高,其温度涨落的幅度基本保持不变,这一持性是由不锈钢的热学参数如热传导率、热扩散率随温度变化的规律所决定的。详细探讨了材料热学参数随温度的变化对温度涨落的影响。更多还原

【Abstract】 The temperature fluctuation of the stainless steel irradiated by a CW CO₂ laser is studied. In the experiment, the temperature fluctuation and the temperature rise is measured by the infrared thermal imagers. It is found that the maximum amplitude of the temperature fluctuation is kept constant with the increase of the laser heating time; this is different from aluminum, low carbon steel, epoxylite and polymethylmethacrylate. This characteristic of the stainless steel is determined by the variance of thermal conductivity and thermal diffusivity with the increase of temperature. A thorough study of the effects of the material thermal properties on the temperature fluctuation is needed.更多还原