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采用自研的SRII型5kW聚焦光束加热设备对珠光体合金铸铁进行了表面熔凝强化处理。借助扫描电镜、光学显微镜、显微硬度和表面硬度计研究了采用不同聚焦模式的光束熔凝处理的合金铸铁的表面硬度、显微硬度分布及光束热作用区的组织转变特点。结果表明,当采用单一模式的反光镜聚焦时,功率密度较低,热作用区的奥氏体发生了托氏体索氏体转变;而采用透镜与反光镜配合的复式聚焦模式时,由于功率密度的提高,奥氏体转变为马氏体。经光束熔凝处理的合金铸铁的表面层是莱氏体组织,表面硬度提高到50HRC,但显微硬度的分布规律与聚焦模式有关。
Self-made SRII 5kW focusing beam heating equipment was used to pearlite alloy cast iron surface fused to strengthen treatment. The surface hardness, microhardness distribution and the microstructure transition of the beam heat affected zone were studied by means of SEM, optical microscope, microhardness and surface hardness tester. The results show that the power density is low and the austenite in the thermal active region undergoes the sorbite sorbite transformation when focusing with a single mode reflector. When using the double focus mode with the lens and the reflector, the power Increased density, austenite into martensite. The surface layer of the alloy cast iron after laser beam fusion treatment is ledeburite, the surface hardness is increased to 50HRC, but the distribution of microhardness is related to the focusing mode.