連続およびパルスレーザ照射による熱サイクルの数値計算

概要

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An equation for a numerical calculation is derived for a heating cycle during the laser beam scan whose power varies as a function of time. Simplified equations are also derived for some special cases. These equations are used for calculating heating cycles during both continuous beam and pulse beam scans imposed on a gray cast iron. The results provide such parameters as a power/ velocity combination to heat the surface to a given temperature, the quench-hardenable thickness, and the time duration being heated above a given temperature. Pulse beam scan is shown to give a fast heating cycles, although the same effect can be obtained with a continuous beam when the scanning speed becomes very fast. Such a fast heating cycle can result in inhomogeneous carbon distribution in the austenite. Effects of quenching such inhomogeneous austenite are discussed.
一般社団法人日本機械学会の論文
2001-02-25