The Effects Of Alloying Enhanced Bionic Units On The Tensile Properties Of Low-carbon Steel

According to bionic theory, regarding plant leaves and dragonfly wings asbiological prototype, research for fatigue resistance improve high-speed rail trainparts has been done. By laser processing technology, process the alloyingstrengthen-unit on the surface of low carbon steel S355to imitate organism tablestructure. The surface morphology of the units, the connection mode of units andbase metal, and the different alloying elements’ units are coupled togetherorganically. The material surface with non-smooth morphology same as thebiological surface structure. The strength of the material is improved.In this paper, alloying units are prepared by laser fuse, combining laseralloying and pulse current technology. Optimize the laser processing parameters andthe pulse current processing parameters. Analysis the organizational structure andmicro-hardness in unit area, effects of alloy composition and unit surfacemorphology on the tensile properties. The research found that, alloying units caneffectively improve the material’s strength beyond30%, pulse current treatment canimprove the bionic unit’s toughness, alloy composition can influence unit’s tensileproperties, different connection between units and base metal and different spacingbetween units cause material’s different tensile properties. The strengthening effectof units with stripe shape is the most obvious and the degree of enhancementincreases with the spacing’s decreasing.