Interface bonding strength is a crucial factor that determines the final mechanical properties and performance of laser cladding coatings. Due to the metallurgical bonding caused by laser cladding, the traditional method of measuring normal interface bonding strength is difficult to use. The present paper proposes a self-designed T-shaped sample and related fixtures to characterize the interface bonding strength. Tensile tests are performed on T-shaped specimens with different cross-sectional areas, and one of the shapes is used for subsequent testing. The fracture morphology of the T-shape samples presented obvious dimples and cleavage steps at the fracture, indicating that the fracture mechanism is hybrid fracture. When the laser power is 2200 W, the T-shaped sample has a higher interface bonding strength of 637 MPa. The effectiveness and repeatability of the method are proved by comparative experiments. This study provides new insights into the better evaluation of laser cladding interface bonding strength in engineering applications.

界面结合强度是决定激光熔覆涂层最终机械性能和性能的关键因素。由于激光熔覆引起的冶金结合，传统的测量正常界面结合强度的方法难以使用。本文提出了一种自行设计的T形样品和相关夹具来表征界面结合强度。对不同截面积的T形试样进行拉伸试验，其中一种形状用于后续试验。T形试样断口形貌在断口处呈现明显的凹坑和解理台阶，表明断裂机制为混合断裂。当激光功率为 2200 W 时，T 形样品的界面结合强度更高，为 637 MPa。通过对比实验证明了该方法的有效性和重复性。这项研究为更好地评估工程应用中的激光熔覆界面结合强度提供了新的见解。