层流冷却辊激光熔覆铁基中熵合金涂层研制

打开文本图片集

Abstract：A new medium-entropy alloy coating of Fe50Cr22（MnNiCuAlTi）20C8 wasprepared bylaser cladding technology in this study. Using experimental equipment such as scanning electron microscope （SEM）， X-ray diffraction （XRD），microhardness tester，and high-temperature frictionand wear testing machine，the microstructure andhigh-temperature wear resistance of this medium-entropy alloy coating were systematically investigated，and a comparative analysis was conducted with the Rocket431SR laser cladding coating which is widely used for laminar cooling rols.The research results showed that the prepared medium-entropy alloy coating Was free of common defects such as pores and slag inclusions，formed a stable metalurgical bond with the substrate，and had excelent overall cladding quality. XRD detection results indicated that the medium-entropy aloy coating was mainly composed of body-centered cubic （BCC） phase;SEM analysis revealed that the coating structure was dominated by equiaxed grains，with asmall amountof TiCparticle precipitates distributed inside thegrains，and continuous Cr23C6 precipitates distributed at the grain boundaries.This unique microstructure provided an important basis for thecoating to possess high hardnessand excellent wear resistance.Theresults of microhardnesstests and hightemperature wear performance tests showed that the hardness of the medium-entropy alloy coating was as high as 790HVo.5，which was significantly higher than that of the Rocket431SR coating; under the high-temperature condition of 600∘C ，itsspecific wear rate was only 45.4% ofthat of the Rocket431SR coating.It exhibited more excellent high-temperature wear resistance and could fully met the actual service requirements of laminar cooling rolls.

Keywords： laminar cooling roll; laser cladding; medium-entropy alloy; wear resistance

1序言

层流冷却是钢板或钢带热轧生产过程中的关键工序之一，层流冷却辊作为其核心部件，其质量与寿命直接关系到钢板或钢带的质量及生产成本。（剩余6673字）