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|Type:||Artigo de periódico|
|Title:||Structural aspects and mechanical properties induced by laser surface remelting of a tool steel|
|Abstract:||A tool steel was surface remelted by a 1.8 kW continuous CO2 laser under conditions of different scanning speeds. Microstructural examination of longitudinal and cross sections of the melted tracks permitted the determination of simple expressions correlating the width and depth of melted pool with the beam scanning speed. Microstructural analysis has indicated a strong modification in the laser remelted zone with secondary dendrite arm spacings of about 1 mu m. This is indicative of a high cooling rate of the order of 10(6) K/s, determined by comparison with the dendrite arm spacing of 80-100 mu m typically observed in a similar material conventionally solidified at a cooling rate of about 0.5 K/s. Vickers hardness measurements were carried out along the treated zone cross sections, and it was found that values of about 800 HV can be attained, which is high compared to a value of 300 HV for the original substrate. A slight variation of treated zone hardness with beam scanning speed was observed.|
|Editor:||Gordon Breach Sci Publ Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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