液压支架激光熔覆不锈钢合金涂层的实验研究

Experimental Study of Stainless Steel Alloy Coating Fabricated by Laser Cladding onto Hydraulic Support

采用激光熔覆技术在硅锰钢样件表面制备了不锈钢涂层,用SEM和能谱仪分析了基体与熔覆层界面以及熔覆层之间的微观组织及成分,开展了试样弯折和冲击强度测试实验。结果表明:在激光功率为6kW、扫描速度为8mm/s、光斑直径为5mm、搭接率30%的工艺条件下,基体与熔覆层界面以及熔覆层之间出现小亮带,形成冶金结合;熔覆方向垂直于观察面的覆层形貌呈蜂窝状,熔覆方向与观察面平行的覆层形貌呈竖直条状;在功率6kW、扫描速度16mm/s、光斑直径5mm、搭接率30%时,熔覆层与基体以及熔覆层之间会产生夹渣;熔覆层具有较好的韧性和冲击强度,熔覆后的试样的冲击强度提高了7.7%。

The stainless steel alloy coating was fabricated on the surface of silico-manganese steel specimen by laser cladding. The SEM and X-ray diffraction were used to analyze microstructure and composition of the clad layers. The bending and impact strength experiments were carried out on the clad specimen. The results show that the bright zone exits in the zone between clad layer and matrix or the zone between clad layers,which forms metallurgical bonding when the laser power is as 6 kW,the scanning speed is as 8 mm/s,the spot diameter is as 5 mm and overlap rate is as 30%. The layer fabri- cated in the direction perpendicular to the observed surface shows honeycomb,and the layer fabricated in the direction parallel to the observed surface shows vertical bars. The slag inclusion forms in the zone between layers during laser cladding when the laser power is as 6 kW,the scanning speed is as 16 mm/s,the spot diameter is as 5 mm and overlap rate is as 30%. The impact strength of the specimen increases by 7.7%, the clad layers have nice toughness and impact strength.