Effect of laser scanning speed on microstructure and properties of Fe-based alloyed layer on ductile iron hot roller surface

doi:10.13251/j.issn.0254-6051.2020.05.046

Abstract

Abstract: Fe-based alloyed layers were prepared on the surface of ductile iron QT600-3 by laser alloying technology. The effect of laser scanning speed on the phase composition, microstructure, mechanical properties, tribological properties at high temperature of the alloyed layers were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD), Raman spectrometer, microhardness tester, friction and wear tester. The results show that the Fe-based alloyed layers exhibit good metallurgical bonding to the substrate and high microhardness (up to 830 HV0.1). And the friction coefficient and wear rate at high temperature decrease to 0.28 and 2.41×10^-6 g·N^-1·m^-1, respectively. The microstructures of the Fe-based alloyed layers are mainly composed of γ-phase dendrites and eutectic carbides, and are refined with the scanning speed increasing. With the increase of laser scanning speed, the thickness of the Fe-based alloyed layers decreases and the crack rate increases, while the microhardness increases first and then decreases, and the wear resistance at 700 ℃ increases. In the high temperature friction and wear test, the wear mechanism of the Fe-based alloyed layers is mainly abrasive wear, fatigue wear and oxidation wear.

Key words: ductile iron, laser alloying, Fe-based alloyed layer, scanning speed, microstructure, wear resistance

CLC Number:

TG174.4

Wang Shuoyu, Zhao Yi, Xie Mingxiang, Ye Wenhu. Effect of laser scanning speed on microstructure and properties of Fe-based alloyed layer on ductile iron hot roller surface[J]. Heat Treatment of Metals, 2020, 45(5): 243-249.

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