层流冷却辊感应熔覆制造技术

为了提高中宽带钢板热轧层流冷却辊的使用寿命，采用中频感应加热技术在层流冷却辊20号钢基体表面制备了KF-Ni60A熔覆层。对熔覆层的SEM、EDS、XRD和硬度进行了分析。结果表明：重熔后界面附近的显微组织分为三部分：基体-过渡区-涂层熔覆区。涂层熔覆区为Ni基的，其上分布着富含铬的块状组织、碳化物及硼化物等硬质相。过渡区内发生了冶金结合。感应重熔后辊面洛氏硬度值为HRC59．6，涂层熔覆层截面方向的维氏硬度均值为698HV0．3。试验辊上机实际应用达到进口件的寿命指标。

Manufacturing Techniques for Induction Cladding on Laminar Flow Cooling Roll

In order to improve the service life of laminar flow cooling roll which used in hot rolled medium-wide strip, the author made KF-Ni60A Cladding Layers on 20# carbon steel which was the substrate of laminar flow cooling roll by medium frequency induction cladding. The author analyzed these cladding layers by SEM, EDS, XRD and hardness. The results are as follows： After induction cladding, the cross-section of specimen＇s interface can be divided into three parts： substrate, intermediate zone and cladding area. Cladding area was Ni-based, and it contained Cr-rich massive microstructure, carbide, borides region which was hard phase. The metallurgical bonding occurred in intermediate zone. The Rockwell hardness of specimen＇s surface was 59.6HRC and the micro-hardness of each point in different distances from substrate was about 698HV0.3. When the experiment roll was used in practical application, its service life reached the importing roll＇s service life.