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为阐述Fe314合金激光熔覆工艺与成形质量之间的内在联系,采用SN比实验设计方法,并以稀释率为参量对熔覆工艺进行了优化分析和量化表征;获得最优化工艺参数为激光功率480W,送粉量8.0g/min,扫描速度600mm/min。验证结果表明:熔覆层稀释率与激光比能、绝对送粉率的定量表征关系具有一定的预测精度。对熔覆层进行组织观察、硬度测试,熔覆层在细小致密的枝晶强化作用下,截面显微硬度为320~400HV0.1,显著高于基体,同时由于大量奥氏体软质相的存在,赋予熔覆层较高的韧性,有利于提高Fe314合金覆层的抗开裂性能。
In order to elucidate the intrinsic relationship between the laser cladding process and the forming quality of Fe314 alloy, the SN ratio experimental design method was used to optimize and analyze the cladding process with the dilution rate as the parameter. The optimum process parameters were obtained as laser power 480W, powder feeding 8.0g / min, scanning speed 600mm / min. The results of the verification show that the relationship between the dilution rate of the cladding layer and the laser specific energy and absolute powder feeding rate has certain prediction accuracy. The microstructure and hardness of the cladding layer were tested. The micro-hardness of the cladding layer was 320-400HV0.1, which was significantly higher than that of the matrix due to the fine and dendritic strengthening. At the same time, due to the large amount of austenite soft phase Exists, giving the cladding a higher toughness, is beneficial to improve the anti-cracking performance of the Fe314 alloy coating.