Abstract:
Features of the structure of R6M5 steel based coatings obtained by multiscan electron-beam fusion of a hardening composition in vacuum have been studied. It is established that the carbide subsystem of the hardened layer is characterized by a multimodal distribution of carbide particles with $d_1$ = 3.8 $\mu$m, $d_2$ = 0.65 $\mu$m, and $d_3<$ 0.25 $\mu$m. The volume fraction of M6C secondary carbide and retained matrix austenite can be controlled within broad limits by varying thermal parameters of the electron-beam fusion. An increase in the retained austenite fraction in the coating leads to improved wear resistance due to the $\gamma\to\alpha'$ marten-site transformation during friction and the presence of dispersed secondary carbides inside the matrix grains.
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