Experimental research on the influence of surface conditions on the total hemispherical emissivity of iron-based alloys

► Influences of roughness and oxidation on total emissivity are investigated. ► Increase roughness will increase total emissivity of iron-based alloy. ► Emissivities of alloy samples oxidized at 400 °C for various times are similar. ► Emissivities of alloy samples oxidized at 600 °C increase with oxidation time. ► Oxide layer formed at high-temperature enhances radiation performance of sample.