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保持预置粉末厚度和其它加工工艺参数不变,采用CO_2激光器在低镍铬无限冷硬铸铁轧辊表面进行纳米陶瓷合金化,研究了两种(1~#与2~#)合金粉末对合金化层硬度和耐磨性的影响。结果表明:2~#粉末在提高合金层表面硬度和耐磨性能方面次于1~#粉末,但合金层的深度和抗热裂纹敏感性比1~#粉末更好。当激光功率为4400 W,扫描速度为3.5 m/min,光斑直径为2.0 mm,合金层的硬度可达1000 HV,是基体(550HV)的1.8倍。
Maintaining the preset powder thickness and other process parameters unchanged, the nano-ceramic alloying was carried out on the surface of the low Ni-Cr alloy chilled cast iron roll by CO_2 laser. The effects of two kinds of alloy powders (1 # and 2 #) on the alloying Layer hardness and wear resistance. The results show that 2 ~ # powder is inferior to 1 ~ # powder in improving the surface hardness and wear resistance of the alloy layer, but the depth of the alloy layer and the resistance to thermal cracking are better than that of the 1 ~ # powder. When the laser power is 4400 W, the scanning speed is 3.5 m / min and the spot diameter is 2.0 mm, the hardness of the alloy layer can reach 1000 HV, 1.8 times that of the substrate (550 HV).