Method for additive manufacturing of a metal part

A method for additive manufacturing of a metal part, by selective sintering of at least one layer (10) of a metal powder by means of a laser beam (12) controlled by a control system, the method for additive manufacturing comprising:

• a determination step, during which a plurality of sets of parameters are determined, in particular each set of parameters comprising:
• a power (P) of the laser beam (12),
• a scanning speed (V) at which the laser beam (12) scans the layer (10),
• a distance (E) between two scanning lines of the laser beam (12) on each layer (10), and/or
• a thickness (H) of each layer (10),
• a production step, during which at least one sample is produced, for each set of parameters, by additive manufacturing using such a set of parameters,
• an analysis step, during which the sample is analyzed to obtain a distribution of at least one dimension (D1, D2) of pores (20) of the sample,
• an obtaining step, during which, for each set of parameters, a manufacturing speed (Vf) is obtained for the manufacture of the part using the set of parameters,
• a selection step, during which one of the sets of parameters (Js) is selected based on the characteristic values for the distribution of the dimension (D1, D2) of the pores (20) and for the manufacturing speed (Vf) associated with each set of parameters, and
• a step of additive manufacturing of the part using the selected set of parameters.