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| Study of extrusion volume on surface densification of powder metallurgical parts |
| HUANG Xian 1，LUO Cheng 1，WANG Tianguo 1，HUA Jianjie2，ZHANG Xiaodong2，
ZHANG Minghui2 |
| （ 1. School of material science and engineering, Hubei University of Automotive Technology, Shiyan 442002,
China; 2. Dong Feng Powder metallurgy Company of Dongfeng Motor Parts and Componenets Group Co. Ltd,
Shiyan 442700, China） |
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Abstract 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/cm3. 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.
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Received: 11 October 2022
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Corresponding Authors:
罗 成（1969—），男，博士，教授，主要研究方向为粉末冶金。
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2024, Vol. 34 
