合金元素对铸铁轧辊激光合金化层性能的影响  

Effect of Alloying Element on Properties of Laser Alloying Layer of Cast Iron Roll

作　　者：孙荣敏[1] 冯树强 

机构地区：[1]广西科技大学鹿山学院,广西柳州545000 [2]柳州市金百汇激光技术有限责任公司,广西柳州545003

出　　处：《热加工工艺》2017年第14期177-179,182,共4页Hot Working Technology

基　　金：广西壮族自治区科研项目资助(KY2015YB520)

摘　　要：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。Under the condition of pre-powder thickness and the other processing parameters unchanged, CO_2 laser was adopted to make nano meter ceramic alloying on low Ni-Cr infinite chilled cast iron roll surface. The effects of two （1# and 2#） alloy powders on the hardness and wear resistance of the alloyed layer were studied. The results show that the improvement of 2# alloy powder in surface layer hardness and wear resistance is inferior to 1# powder, but the depth of the alloy layer and thermal crack sensitivity is better than 1# powder. When the laser power is 4400 W, scanning speed is 3.5 m/min, and spot diameter is 2.0 mm, the microhardness of the alloyed layer is 1000 HV, which is about 1.8 times of substrate（550 HV）.

关 键 词：激光合金化 裂纹 硬度 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG113.1[金属学及工艺—金属学]