Abstract
In this study, a Fe-based alloy material was fabricated by laser on the inner shell of a brake drum. The thermal conductivity of the composite brake drum was analyzed and discussed by conducting experiments on the shell nodular cast iron substrate, laser manufacturing materials, and their composites, as well as different heat transfer directions of laser manufacturing materials. At 500 °C, the thermal conductivity of the matrix was 21.434 W/(m·K), the Fe-base alloy was 15.271 W/(m·K), and the composite sample was 17.442 W/(m·K), which was close to the average value of the two. The grain characteristics and microstructure of the alloy were different in different directions. The thermal conductivities of the samples in the x-, y-, and z-directions were 17.047 W/(m·K), 16.665 W/(m·K), and 15.271 W/(m·K), respectively; the diffusion was slower in the z direction and fastest in the x direction.
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