Localized boriding of low-carbon steel using a Nd:YAG laser
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Localized boriding of low-carbon steel by the conventional technique requires tedious preboriding treatment and a long processing time. Laser boriding of low-carbon steel can be performed faster, and without any preboriding treatment. The feasibility of selective boriding of AISI 1018 steel using a Nd∶YAG laser has been investigated. High hardness in the range 950–2200 Hv was obtained during laser boriding of AISI 1018 steel. The wide range of hardness is due to the variety of microstructures possible during laser boriding. Electron microprobe analysis showed that the highest hardness (2200 Hv) was due to the formation of FeB, and the lowest hardness was due to a mixture of Fe2B and eutectic (αFe+Fe2B). The most desirable microstructure in laser boriding of AISI 1018 steel was found to be Fe2B, which incorporates a combination of a high hardness, in the range of 1300–1700 Hv, and a compressive stress at the treated surface.
KeywordsPolymer Microstructure Processing Time Compressive Stress Material Processing
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