3种碳钢的光谱发射率对比研究

利用搭建的能量对比法光谱发射率测量装置,对3种典型的低碳钢310、中碳钢45#和高碳钢T10的光谱发射率进行了测量.实验结果表明:合金成分会对钢的发射率产生不同程度的影响,并且这种影响在氧化前后是不同的.对于未氧化的钢,碳质量分数越高,光谱发射率会越大.3种钢的发射率相差不超过0.05.氧化后3种钢的光谱发射率随波长的变化趋势相同,但是光谱发射率值比氧化前大.因为钢成分中的Al、Cr、Ni等成分会抑制钢氧化膜的生长,使得45#钢的光谱发射率值比310钢和T10钢大.氧化后310和T10钢的表面由原来的银白色变成了淡蓝色,45#钢变成了紫黄色,钢表面颜色也会对光谱发射率产生影响.

Comparative Study on Spectral Emissivity of Three Kinds of Carbon Steel

The spectral emissivity of three typical low carbon steels 310,medium carbon steels 45 and high carbon steels T10 were measured by a self-designed spectral emissivity measurement apparatus.The experimental results showed that different compositions have effects on the emissivity of steel before and after oxidation.For unoxidized steel,the higher the carbon content,the greater the spectral emissivity,and the difference of spectral emissivity of three kinds of steel was less than 0.05.Varying trend with wavelength in the spectral emissivity of three kinds of steel after oxidation was the same as that before oxidation,but the spectral emissivity value was larger than that before oxidation.The existences of Al,Cr,Ni in the steel will inhibit the growth of the steel oxide film,thus the spectral emissivity of 45 # steel was slightly larger than that of 310 and T10steel.During the oxidation process,the color of 310 and T10steel surface changes from silvery white into light blue,while the45 # steel into coppery.And these changes in surface color may also affect the spectral emissivity.