| Abstract: | The susceptibility of two-phase aluminum bronzes to harden by quenching is well known. This work deals with the features of hardening from liquid or solid phases of several bronzes with 9-11% Al under the action of CO2 continuous wave laser beam with a power of 1300 W coupled with a table in x-y-z coordinates digitally controlled. In order to determine the hardening conditions, the influence of the processing parameters on the geometry of the hardened layer and surface hardness was analyzed. By the microstructural analysis of the hardened layer, the hardening degree measured by the microhardness meter and structural changes were correlated. The microhardness profile on the depth of the heat-affected zone was traced. The range of the analyzed bronzes points out the influence of the initial condition and of the Ni, Fe, and Mn alloy elements contents on the microstructure, size, and hardness of the hardened layer. The effect of subsequent tempering was investigated. |
