| XIE Ling-ling,CHEN Chang-peng,LI Lan,HUANG Zhen-yi.Finite Element Optimization of WC-12Co Coatings Aiming to Improve Wear Resistance of the Extrusion Container Inner Wall[J],46(12):126-132 |
| Finite Element Optimization of WC-12Co Coatings Aiming to Improve Wear Resistance of the Extrusion Container Inner Wall |
| Received:July 24, 2017 Revised:December 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.12.021 |
| KeyWord:WC-12Co coating extrusion container coating thickness wear resistance thermal-stress coupling |
| Author | Institution |
| XIE Ling-ling |
Metallurgical Engineering School, Anhui University of Technology, Ma’anshan , China |
| CHEN Chang-peng |
Metallurgical Engineering School, Anhui University of Technology, Ma’anshan , China |
| LI Lan |
Metallurgical Engineering School, Anhui University of Technology, Ma’anshan , China |
| HUANG Zhen-yi |
Metallurgical Engineering School, Anhui University of Technology, Ma’anshan , China |
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| Abstract: |
| The work aims to improve wear resistance of extrusion container inner wall by acquiring optimization scheme of WC-12Co coating thickness. With two layers of multi-shrinking extrusion containers as research objects, finite element modeling was performed to study effects extrusion container inner wall with WC-12co coatings or not and coating thickness on stress distribution of extrusion containers based on ANSYS software. After the coatings were applied, coating stress was distributed reasonably and below yield strength of the coatings at the temperature under the conditions of assembly, extrusion-assembly and heat-extrusion-assembly; overall stress was lower because prestress arising from thermal stress and magnitude of interference cancelled each other out under the condition of heat-assembly; meanwhile, equivalent stress changed significantly at the joint between the coatings and extrusion containers, while stress in other positions changes slightly compared to that when no coating was applied. Under various conditions, the maximum equivalent stress in the containers decreased with the increase of coating thickness, and coating thickness had greatest effect on the maximum stress under the condition of heat-extrusion-assembly. As the coating thickness increases in the selected range of coating thickness, the maximum stress carried by the extrusion containers decreases, which is more conductive to the use of extrusion container. When the coating thickness is 6.4 mm, the maximum equivalent stress under all working conditions is the minimum, and that under the condition of heat-extrusion-assembly is 845.38 MPa, which is far lower than yield strength of H13 steel, hence it meets actual usage requirements. |
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