Funct. Mater. 2022; 29 (3): 381-387.

doi:https://doi.org/10.15407/fm29.03.381

Study of extrusion, microstructure and mechanical properties of 5CrNiMo alloy reinforced with WC particles

Xianzhang Feng1, Junwei Cheng2, Xinfang Zhang2

1School of Aerospace Engineering, Zhengzhou University of Aeronautics, 450046 Zhengzhou, Henan, P.R. China
2School of Materials Science and Engineering, Zhengzhou University of Aeronautics, 450046 Zhengzhou, Henan, P.R. China

Abstract: 

In order to solve the problems of high toughness, poor thermal strength and low working temperature of 5CrNiMo, the influence of additives on the properties of 5CrNiMo (hot working die steel, which has high toughness, poor thermal strength and low operating temperature) has been studied. A compound composed of tungsten and carbon, with the molecular formula WC was added to 5CrNiMo and most of the WC particles were dissolved in the high temperature molten steel. During the eutectic reaction, the element W precipitates in the form of Fe3W3C. The matrix has a fine-grained pearlite structure in which a large amount of carbide particles are released in situ. The object of study is a guide rod with a hollow shaft made of 5CrNiMo reinforced with WC particles. The direct extrusion process is analyzed and calculated, and a simulated extrusion process is calculated to analyze the stress, deformation and damage of the metal during the forming process. The parts go through a heat treatment process of spheroidal annealing at 950°C and tempering at 600°C. Studies have shown that a large amount of carbides dissolve, a large amount of bainites are formed in the structure, and the effect of dispersion strengthening is achieved. The strength and hardness of the material is improved.

Keywords: 
heat treatment, microstructure, tempering, extrusion, working procedure.

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References: 
1. Yan Weicong, Management and Technology, 16, 284 (2013).
https://doi.org/10.1504/IJETM.2013.050683
 
2. Zhang Liang, Commercial Automobile, 12, 90 (2013).
 
3. Sun Zhaopeng, Liu Shanzeng, Wu Nan, Finite Element Analysis of Main Girder of Double-beam Bridge Crane Based on ANSYS, Coal Mine Machinery (2012).
 
4. Feng Xianzhang, Cheng Junwei, Cui Yanmei, Jiang Zhiqian, Functional Materials, 23, 636 (2016).
https://doi.org/10.15407/fm23.04.450
 
5. Ye Tiansheng, Li Lianhe, Hoisting and Transportation Machinery, 10, 51 (1986).
 
6. Tang Jianqun, Zhang Lijing, Gong Jianming et al., Phys. Chemi. Tests (Physical Volume), 3, 138 (2004).
 
7. Meng Xianyi, Modern Design Methods for Construction Machinery, Ordnance Industry Press, Beijing (2009).
 
8. Cheng Junwei, Feng Xianzhang, Zhang Xinfang, Jiang Zhiqiang, Forging & Stamping Technology, 40, 13 (2015).
 
9. Y.H.Kim, T.K.Ryou, H.J.Choi et al., J. Material. Proces. Techn., 123, 270 (2002).
https://doi.org/10.1016/S0924-0136(02)00087-0
 
10. Ola Jensrud, Ketill Pedersen, J. Material. Proces. Techn., 80-81, 156 (1998).
https://doi.org/10.1016/S0924-0136(98)00219-2
 
11. Jia Xiaoshuai, Zuo Xunwei, Chen Nai et al., Acta Metallurgica Sinica, 49, 35 (2013).
https://doi.org/10.3724/SP.J.1037.2012.00351
 
12. Cheng Junwei, Feng Xianzhang, Xia Juchen et al., J. Plasticity Engineer, 15, 42 (2008).
 

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