Affiliation:
1. School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China
Abstract
Laser cladding is a powerful surface treatment technique that can significantly enhance the properties of metal alloys. This study delves into the liquid phase separation behavior of Cu-Fe-Cr alloys under the rapid solidification conditions inherent in laser cladding and evaluates the influence of 4% Mo and 2% B4C additions on the resulting alloy characteristics. The intensive undercooling characteristic of the laser cladding process facilitates the alloy’s entry into the liquid-phase immiscibility gap, prompting pronounced phase separation. Our investigation reveals the emergence of Fe-rich regions, exhibiting a variety of shapes, set against a continuous Cu-rich matrix. The incorporation of Mo and B4C was found to modulate the mixing enthalpy and entropy, thereby refining the phase distribution: Mo was observed to prevent the agglomeration of Fe cores, resulting in a dispersion of isolated Fe cores throughout the Cu-rich matrix, while B4C promoted a more uniform compositional distribution. This study further enumerates the enhancements in microhardness, wear resistance, and magnetic properties of the alloys. Notably, the Cu-Fe-Cr-Mo-B4C alloy demonstrated a microhardness exceeding 600 HV, a low coefficient of friction around 0.15, high saturation magnetization, and reduced coercivity. These results underscore the efficacy of laser cladding in tailoring the microstructure and properties of Cu-Fe alloys, providing insights for the controlled manipulation of phase separation to optimize surface characteristics for engineering applications.
Funder
National Natural Science Foundation of China
Liaoning Provincial Department of Education Project
Liaoning Provincial Key Laboratory of Large Equipment Intelligent Design and Manufacturing Technology
Research on the Theory and Method of Quality Intelligent Control in the Re-manufacturing Process of Waste Mechanical and Electrical Products
Program for the Top Young Innovative Talents of Lianoning Revitalization Talent Program
Program for the Top Young and Middle-Aged Innovative Talents of Shenyang
Subject
Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces