亚共晶白口铸铁等离子弧表面淬火的淬硬层性能研究  

Study on Plasma Arc Surface Hardening of Hypeeutectic White Cast Iron

作　　者：白代萍[1] 何培英[1] 樊宁[1] 张德海[1] 

机构地区：[1]郑州轻工业学院机电工程学院,河南郑州450002

出　　处：《热加工工艺》2013年第16期129-131,134,共4页Hot Working Technology

基　　金：郑州市科技攻关项目(10PTGG339-8);郑州轻工业学院校一般项目科研基金资助项目(2012XJJ012)

摘　　要：运用等离子弧束作为热源对亚共晶白口合金铸铁进行表面淬火处理,采用正交试验法优化等离子弧表面淬火工艺参数,分析各主要工艺参数对淬硬层硬度、深度的影响规律,并对处理后淬硬层显微硬度和显微组织状态进行分析与讨论。结果表明:对淬硬层硬度影响的主要参数是工作电流,其次是喷嘴工件间距,然后才是弧束的扫描速度;对淬硬层深度影响最大的参数是弧束的扫描速度,其次为工作电流;随着电流值的增加,淬硬层深度、硬度提高,但需要控制工作电流值;随着扫描速度的提高和喷嘴到工件距离的不断增加,淬硬层的硬度、深度下降;利用等离子弧束对工件进行表面淬火处理,需确定最佳工艺参数。Plasma arc was used as a heat source to make a surface quenching on hypoeutectic white alloy cast iron, and orthogonal test was used to optimize the surface hardening technological parameters of plasma arc. The influences of the technological parameters on the hardening layer＇s hardness and depth were analyzed, the microhardness and the microscopic structure condition of the hardening layer after being disposed were also analyzed. The results show that： the primary factor is the working current, the minor factor is the distance between the nozzle and the workpieces, the third factor is the scanning speed of arc bundle, which impose an influence on the hardness of hardening layer; the primary factor is the scanning speed, the minor factor is the working current, which impose an influence on the depth of hardening layer; the hardness and depth of hardening layer increase along with the increase of the working current which must be controlled, the hardness and depth of the hardening layer decrease along with the increase of the scanning speed and the distance between the nozzle and the workpiece. Using plasma arc to make surface quenching, the optimal techniques parameters must be confirmed.

关 键 词：等离子弧 表面淬火 合金铸铁 淬硬层 

分 类 号：TG156.3[金属学及工艺—热处理]