变形量对粉末冶金零件表面致密化的研究  

Study of extrusion volume on surface densification of powder metallurgical parts

作　　者：黄贤 罗成 王天国 华建杰 张晓东 张明辉 HUANG Xian;LUO Cheng;WANG Tianguo;HUA Jianjie;ZHANG Xiaodong;ZHANG Minghui(School of material science and engineering,Hubei University of Automotive Technology,Shiyan 442002,China;Dong Feng Powder metallurgy Company of Dongfeng Motor Parts and Componenets Group Co.Ltd,Shiyan 442700,China)

机构地区：[1]湖北汽车工业学院材料科学与工程学院,湖北十堰442002 [2]东风汽车零部件(集团)有限公司东风粉末冶金公司,湖北十堰442700

出　　处：《粉末冶金工业》2024年第1期70-75,共6页Powder Metallurgy Industry

基　　金：湖北省高等学校优秀中青年科技创新团队计划资助项目(T201811)。

摘　　要：采用整形致密化技术,研究了变形量对粉末冶金Fe-Cu-Mn-Mo-C材料表面致密化层深度的影响。实验通过增加变形量来减小零件表面的孔隙,提高其表面致密层深度与硬度等性能。结果表明,采用挤压致密化技术制备的粉末冶金零件表面可以形成均匀的致密层,零件的表面硬度有较大的提高。当完成变形量提高到0.4 mm和0.6 mm后,在试样密度6.8 g/cm^(3)与7.0 g/cm^(3)的粉末冶金零件表面形成大约0.25~0.4 mm致密层。表面致密层深度和硬度均随变形量的增加而增加,说明了变形量是影响零件表面致密化效果的重要因素之一。The effect of deformation on the depth of the surface densification layer of powder metallurgical Fe-CuMn-Mo-C materials was investigated using plastic densification techniques.By increasing the amount of deforma-tion,the pores on the surface of the parts were reduced and the surface densification depth and hardness were im-proved.The experimental results show that the surface of the powder metallurgy parts prepared by extrusion densi-fication technique can form a uniform densification layer and the surface hardness of the parts can be improved.When the finished deformation is increased to 0.4 mm and 0.6 mm,a dense layer of about 0.25-0.4 mm is formed on the surface of the powder metallurgical parts with a specimen density of 6.8 and 7.0 g/cm^(3).The depth and hard-ness of the surface dense layer increase with the amount of deformation,indicating that the amount of deformation is one of the most important factors influencing the surface densification effect of the parts.

关 键 词：整形 表面致密化 表面硬度 致密层 粉末冶金零件 

分 类 号：TF123[冶金工程—粉末冶金]