研究目的
To study the effect of laser processing parameters on the microstructure and microhardness of the surface layer of carbon powder steel with different porosities.
研究成果
The study established the boundary values of the integral criterion for the parameters of laser influence for the heat treatment of carbon powder steels. The results of metallographic analysis coincide with the calculated geometric and temperature parameters of the laser exposure zones, indicating the correct formulation of the thermal problem. The model could be used to predict the results of LT of the studied steels.
研究不足
The study is limited to carbon powder steels with specific porosities and a 1 kW fiber laser. The applicability of the findings to other materials or laser types is not explored.
1：Experimental Design and Method Selection:
Laser surface treatment was carried out on carbon steel samples containing 1% carbon - PA-ZhGr powder steels with porosity of 4%, 8% and 10%, as well as for comparison with cast (non-porous) U10 steel.
2：Sample Selection and Data Sources:
Samples of powder steels were prepared by powder metallurgy from iron powder and colloidal graphite.
3：List of Experimental Equipment and Materials:
Industrial additive manufacturing machine Optomec LENS 850-R with a 1 kW fiber laser in argon, Knoop/Vickers Tester 402MVD hardness tester, Axiovert 40 Mat optical microscope.
4：Experimental Procedures and Operational Workflow:
Laser surface treatment was carried out on samples in the form of parallelepipeds of 25x25x200 mm.
5：Data Analysis Methods:
Microhardness was measured according to GOST 9450-76, and the study of the microstructure and the measurement of the geometric parameters of the exposure zone were carried out with an optical microscope.
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