Laser Microstructure Modification of Metallic Materials |
| B. Major, R. Ciach Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Reymonta 25, 30-059 Kraków, Poland R. Ebner and F. Jeglitsch Christian Doppler Laboratory for "Laser Application in Materials Research" at the Institute for Metals Technology and Materials Testing, Montanuniversity Leoben, Austria |
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| Structure changes in laser constituted surface layers of aluminium alloys of the systems: Al-Zn, Al-Fe, Al-Fe-Ni, Al-Si were examined. Significant structure refinements and even formation of characteristic precipitates for rapidly quenched microstructure were found. Fine martensitic microstructure was observed in constructional steels of the types: X45CrSi92 (H9S2) and C50 (50G) subject to a laser modification. The study of influence of the chemical composition on the solidification structure and hardness was carried out on a steel 45, as well as on a high speed steel M2 (SW7M), by laser alloying using carbides of the types: VC, Mo2C and the borides of the types: CrB, VB2, B4C. Thermodynamic calculations of phase diagrams were made to predict the changes of the constitution due to laser alloying. A comparison of the solidification structures and the calculated phase diagrams revealed a good agreement, especially for carbides. Boride alloying led to very complex microstructures consisting of various metallic and intermetallic phases. |
| DOI: 10.12693/APhysPolA.89.171 PACS numbers: 52.50.Jm, 64.70.Dv |