Martensitic stainless steels are suitable for diverse structural applications but degrade when subjected to wear-prone activities in service. To enhance their service life, the densification of high Cr, martensitic, X190CrVMo20-4-1 tool steel powder on two different martensitic stainless steel substrates via supersolidus liquid-phase sinter (SLPS) cladding was investigated. The objective was to assess the influence of the difference in compositions of the martensitic stainless steels employed as substrates on the interfacial diffusion, microstructure, hardness and bonding strength of the steel-to-steel claddings. Computational thermodynamics and diffusion simulations were employed to supplement experimental findings. Owing to interdiffusion, a M₇C₃ carbide-free, banded region exists in the X190 adjacent to the interface with the width dictated by chemical potential gradient of carbon. The hardness of the substrate was lower near the interface region because of carbon enrichment, which promoted the presence of retained austenite. An interfacial strength of 798 MPa was achieved with fairly ductile X190 matrix near the cladding interface as the fracture surface was characterized by mixed fracture modes of dimple rupture and cleavage with localized quasi-cleavage features. Experimental observations and computational simulations are in agreement. The implications of the SLPS cladding technique are discussed in the context of tool development.

马氏体不锈钢适用于各种结构应用，但在使用中易发生磨损时会降解。为了延长其使用寿命，研究了通过超固相液相烧结（SLPS）熔覆在两种不同的马氏体不锈钢基材上致密高铬，马氏体X190CrVMo20-4-1工具钢粉的致密性。目的是评估用作基底的马氏体不锈钢的成分差异对钢对钢熔覆层的界面扩散，显微组织，硬度和结合强度的影响。计算热力学和扩散模拟被用来补充实验结果。由于相互扩散，M ₇ C ₃X190中的无碳化物带状区域存在于界面附近，其宽度由碳的化学势梯度决定。由于碳富集，在界面区域附近的基底硬度较低，这促进了残留奥氏体的存在。在包层界面附近用相当易延展的X190基质获得了798 MPa的界面强度，因为断裂表面的特征在于酒窝破裂和劈裂的混合断裂模式具有局部准劈裂特征。实验观察和计算模拟是一致的。SLPS覆层技术的含义在工具开发的背景下进行了讨论。