激光熔覆矿井液压支架用FeCrNiBSiC系合金组织性能的研究

Study on Microstructure and Properties of FeCrNiBSiC Alloy for Laser Cladding Mine Hydraulic Support

针对现有煤矿液压支架表面激光熔覆层抗腐蚀性差、裂纹敏感性高的问题,通过提高合金成分中Ni元素含量,添加Nb元素及控制C元素含量的方法,以期提高熔覆层抗腐蚀性并降低裂纹敏感性。本文通过扫描电镜、EDS等测试方法对成分改进前后的熔覆层组织结构进行了分析,并对200h盐雾腐蚀后的熔覆层组织结构及腐蚀机理进行了分析探讨。结果表明,Ni含量的提高使得熔覆层内残余奥氏体含量增加,从而增加熔覆层韧性,有效降低裂纹敏感性;添加Nb元素及控制C元素后,有效控制了Cr23C6的形成,提高熔覆层抗腐蚀性。

Aiming at the problem of poor corrosion resistance and high crack sensitivity of the laser cladding layer on the surface of existing coal mine hydraulic support,the corrosion resistance of the cladding layer is improved by increasing the content of Ni,adding Nb element and controlling the content of C element in the alloy composition.In this paper,the microstructure of the cladding layer with improved composition is analyzed and the corrosion mechanism after 200h salt spray corrosion is discussed by scanning electron microscopy,EDS and other test methods.As a result,the increase of Ni content improves the retained austenite content in the cladding layer,thereby enhancing the toughness of the cladding layer and effectively reducing the crack sensitivity.By adding the Nb element and controlling the C element,the formation of Cr23C6 is effectively controlled,and the corrosion resistance of the cladding layer is improved.