作　　者： ; ; ; ; ;

机构地区： 南京工程学院材料工程学院

出　　处： 《材料热处理学报》 2014年第6期190-194,共5页

摘　　要： 采用浆料包渗法,以B4C为供硼剂,NH4Cl+KBF4为复合活化剂,SiC为填充剂,蛋白质(鸡蛋清)为粘结剂,在W6Mo5Cr4V2高速钢表面制备渗硼层。研究了渗硼温度对渗硼层组织和性能的影响。结果表明:包渗温度650℃时,渗硼层组织以Fe2B相为主,在750℃、850℃时,形成了V2B3相,在950℃时渗硼层组织中出现了Fe2Si0.4B0.6相;渗硼层的显微硬度随温度的升高先增后降低,其最小显微硬度值为810 HV,为基体的(235 HV)3.5倍;渗硼层最小摩擦系数为0.12,为基体的1/3。磨损机制在750℃时发生转变,由粘着磨损为主转变为磨料磨损为主。 A boronized coating was prepared on the surface of W6Mo5Cr4V2 steel by means of the slurry pack cementation process. B4C was used as bronzing source,NH4Cl + KBF4as a dual activator,SiC as filler and albumen( egg white) as cohesive agent. The effects of bronzing temperatures on microstructure and properties of boronized coating were investigated. The results show that the microstructure of the boronized coating at 650 ℃ is mainly composed of Fe2B phase,while V2B3phase appeared at 750 ℃ and 850 ℃,Fe2Si0. 4B0. 6phase at 950 ℃,respectively. The microhardness of the boronized coating increases firstly,and then decreases with the increasing of temperature,the minimum microhardness of the boronized coating( 810 HV) is 2. 5 times larger than that of the matrix( 235 HV),and minimum value of friction coefficient is 1 /3 of the matrix. The wear mechanism can change from mainly adhesive-abrasive to predominantly abrasive wear mechanism at 750 ℃.

关 键 词： 高速钢 渗硼温度 耐磨性能

领　　域： [金属学及工艺] [金属学及工艺]