Metal material tensile property evaluation method based on selective laser melting technology

Abstract

The invention discloses a metal material tensile property evaluation method based on selective laser melting technology. The method includes the steps of: paving to-be-evaluated material powder on a substrate, using selective laser melting equipment to perform additive manufacturing molding of multiple tensile samples; intercepting at least one tensile sample randomly from the substrate, and calculating the nominal cross sectional area of the tensile sample; putting the substrate and the remaining tensile samples on a mechanical property testing machine to undergo tensile test, and recording the tension-displacement curve of each tensile sample; and subjecting the recorded tension-displacement curve of each tensile sample to data processing and analysis so as to acquire the maximum value, minimum value and distribution law of the corresponding to-be-evaluated material's mechanical properties under the technological conditions. The evaluation method provided by the invention not only greatly reduces the cost of the raw material powder, but also obviously shortens the test cycle, and is especially suitable for the initial material selection at the product design stage and the process evaluation of additive manufacturing.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a method for evaluating tensile properties of metal materials based on selective laser melting technology. Background technique [0002] Additive manufacturing is a revolutionary method developed in the past three decades, including selective laser melting technology, electron beam melting technology, etc. It is not only a component forming method but also a material preparation method. Compared with traditional manufacturing methods, the heating and cooling speed of materials in the additive manufacturing process is faster, and the microstructure of the obtained materials is finer and more uniform. [0003] At present, the method for evaluating the tensile properties of additive manufacturing materials is to use additive manufacturing equipment to print traditional tensile samples, cut the tensile samples from the substrate, and perform tensile tests. This proce...

AI Technical Summary

Problems solved by technology

This process requires a long time and a lot of raw materials, and the number of printed samples on a substrate is limited, which cannot provide a sufficient number of tensile test samples, and cannot fully grasp the tensile properties of the materials prepared by the process parameters used. The resulting tensile properties have some contingency

If you want to expand the number of samples in the tensile test, you need a longer cycle, more powder, increased time and cost

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