Abstract: A method for determining an oxygen concentration of a powder of a metallic material taking the form of a powder bed, the method includes steps consisting in: A) producing an image of at least a part of the powder bed, the image comprising a set of pixels, a pixel having a colour coded in accordance with a colorimetric code comprising three quantities, B) determining the oxygen concentration of the powder from values of the three quantities associated with pixels of the image using a predefined calibration function, a function of the material, and linking the oxygen concentration and the three quantities.

Abstract: A method for additive manufacturing of a metal part, by selective sintering of at least one layer of a metal powder by means of a laser beam includes a determination step for determining a plurality of sets of parameters, a production step for producing at least one sample for each set of parameters by additive manufacturing, an analysis step for analyzing the sample to obtain a distribution of at least one dimension of the pores of the sample, an obtaining step for obtaining a manufacturing speed for the manufacture of the part using the set of parameters, a selection step for selection one of the sets of parameters based on the characteristic values for the distribution of the dimension of the pores and for the manufacturing speed associated with each set of parameters, and a step of additive manufacturing of the part using the selected set of parameters.

Abstract: A method for determining an oxygen concentration of a powder of a metallic material taking the form of a powder bed, the method includes steps consisting in: A) producing an image of at least a part of the powder bed, the image comprising a set of pixels, a pixel having a colour coded in accordance with a colorimetric code comprising three quantities, B) determining the oxygen concentration of the powder from values of the three quantities associated with pixels of the image using a predefined calibration function, a function of the material, and linking the oxygen concentration and the three quantities.