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摘自《Journal of Materials Science》,1988,23,№5,1547～1552。 激光束辐照使碳素钢和低合金钢表面局部被加热至熔点左右的高温,于随后快速重凝或自淬作用而引起表面硬化。本文对AISI 1045钢于单一激光束照射后的组织与显微硬度进行了研究。首先从φ25mm的商业性AISI 1045钢棒切取5mm厚圆形试片,经320号砂纸打磨后由直径为200μm的连续CO_2,激光束辐照。为保护透镜不受污染和过热以及尽量减小在激光束辐照下试样表面发生的氧化,用一个大气压以上的Ar或N直接流入辐照表面。试样固定于转台,调节转台转速可改变激光束掠过试样表面的速度。
From “Journal of Materials Science”, 1988, 23, No. 5, 1547 ~ 1552. Laser beam irradiation causes the surface of the carbon steel and the low alloy steel to be partially heated to a high temperature around the melting point, followed by rapid solidification or self-quenching to cause surface hardening. In this paper, the microstructure and microhardness of AISI 1045 steel irradiated by a single laser beam were studied. First, a 5 mm thick circular test piece was cut from a φ25 mm commercial AISI 1045 steel rod and polished with 320 grit sandpaper and irradiated with a continuous laser beam of 200 μm in diameter. To protect the lens from contamination and overheating and to minimize the oxidation occurring on the specimen surface under laser beam irradiation, Ar or N above atmospheric pressure is directed into the irradiated surface. Sample is fixed on the turntable, adjust the turntable speed can change the speed of the laser beam across the surface of the sample.