Numerical simulation of canned extrusion process of the W-25wt. %Cu composites under low temperature and liquid sintering

2nd International Conference on New Material and Chemical Industry

材料科学;化学工业

Ma, D.Q.^1,2 ; Xie, J.P.^1,2 ; Song, Y.H.^1

School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang

471023, China^1

Non-Ferrous Metal Generic Technology Collaborative Innovation Center of Henan Province, Luoyang

471023, China^2

关键词: Backward extrusion;    Extrusion process;    Extrusion temperatures;    Hot extrusion process;    Parameter selection;    Stress and strain distribution;    Utilization rates;    Vacuum sintering;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/292/1/012092/pdf
DOI  :  10.1088/1757-899X/292/1/012092

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The W-25wt. % Cu compacts prepared by low temperature vacuum sintering (sintering at 1090°C), and then hot extrusion under low temperature and canning backward extrusion (extrusion temperature is 1090°C, extrusion ratio is 7.7), finally annealing at 900°C have better properties. The defects such as fracture and canning cracking and the low utilization rate of materials due to the uneven distribution of the W-Cu materials along the longitude were solved by the numerical simulation of the hot extrusion process of the billet and defect analysis in the canning backward extrusion process. The good coincidence of the distribution of the W-Cu materials and the loading force in the hot extrusion experiment with the numerical simulation results proved the accuracy of the model and parameter selection in numerical simulation. So the simulation results have practical significance. The results show that canning cracking was mainly due to the difference strain and flow speed between the canning and the W-Cu billet, while the flow of the W-Cu billet was affected by the structure and material of the canning. It is concluded that when the extrusion temperature was near the melting point of copper phase, the extrusion speed was in the range of 5 to 10 mm/s, extrusion ratio was in the range of 7.7 to 11, the canning thickness was 5 mm and material was AISI-1016 can not only improve the temperature and stress and strain distribution of billet and canning but also enhanced the flow uniformity of billet.