| YANG Jian-ye,XIE Kun,YUE Li-jie,XIA Peng-cheng,CAO Mei-qing,TAN Yun-liang.Investigation on Ordered Arrangement of Cemented Carbide Particles Reinforced Iron Matrix Composites[J],52(1):132-140 |
| Investigation on Ordered Arrangement of Cemented Carbide Particles Reinforced Iron Matrix Composites |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.01.014 |
| KeyWord:ordered arrangement particle reinforcement metal matrix composites cemented carbide wear resistance |
| Author | Institution |
| YANG Jian-ye |
School of Materials Science and Engineering,Shandong Qingdao , China |
| XIE Kun |
School of Materials Science and Engineering,Shandong Qingdao , China ;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Shandong Qingdao , China |
| YUE Li-jie |
School of Materials Science and Engineering,Shandong Qingdao , China |
| XIA Peng-cheng |
School of Materials Science and Engineering,Shandong Qingdao , China |
| CAO Mei-qing |
School of Materials Science and Engineering,Shandong Qingdao , China |
| TAN Yun-liang |
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Shandong Qingdao , China |
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| Abstract: |
| Because WC is easy to react with Fe and other elements and form brittle phase, WC reinforced composites have the problem of insufficient toughness. The use of WC-Co cemented carbide particles is conducive to reduce the reaction between metal and WC, which makes the bonding between reinforcement particles and matrix more firm. For particle reinforced composites, the arrangement of strengthening phases has a great influence on the strengthening effect. The ordered arrangement of the reinforcement particles in the composites can avoid the agglomeration of the reinforcing phase, reduce stress concentration, and improve the comprehensive mechanical properties of the composites. The high chromium cast iron composites reinforced by ordered arrangement of cemented carbide particles were fabricated by centrifugal casting with the way of pre-arranging and pre-fixing WC-Co cemented carbide particles. The work aims to study the effect of ordered arrangement of cemented carbide reinforcements on the micro-structure and properties of high chromium cast iron. Before the experiment, the surface of high chromium cast iron was polished with sandpaper, then cleaned with ethanol. The oil stain, oxide and other impurities on the surface of WC-Co cemented carbide particles were cleaned with alkali solution. Then the cemented carbide particles were arranged into an array structure at a spacing of about 4 mm, and preseted on the inner surface of the vertical centrifugal casting mold. After the cleaned high chromium cast iron of 500 g was melted in an induction furnace, it was poured into the mold for centrifugal casting to obtain a ring-shaped ingot. The pouring temperature was 1 400 ℃, and the rotating speed of the centrifugal casting mold was 1 392 r/min. The samples with the cross section were cut with electric spark wire cutting (DK3332), ground and polished. Then they were corroded with 6% nital solution. The microstructure of the composites was observed by electron probe (JXA-8230) and a scanning electron microscope (Apreo S HiVac). The component is analyzed by the EDS spectrum of each selected point taken by an energy spectrometer. The phase composition of the composites is detected by an X-ray diffractometer (D8 Advance). The microhardness is tested from the matrix to the reinforcement area by digital microhardness tester (FM-700/SVDM4R). The friction test is carried out on a multifunctional friction and wear tester (MVF-1A). The volume loss of the composites after friction test was calculated, and the morphology of the friction surface was observed. The results indicated that the cemented carbide particles were arranged in order in the composites, and good metallurgical combination between the cemented carbide particles and matrix was achieved. There was a gradient transition layer consisting of melting zones on the surface of the particles and carbide dispersion zones in the materials. There were W2C, Fe3W3C, Co3W3C in the transition layer. The hardness values also showed a gradient change. Those were beneficial to the decrease of stress concentration. Compared with the high chromium cast iron, the wear volume of the composites was reduced respectively by 57.6% and 69.2% with the loads of 100 N and 150 N. It indicated that the ordered arrangement of hard particles can reduce the abrasive wear and delamination wear of the composites. Therefore, the ordered arrangement of the reinforcement particles can improve the performance designability of the composites and promote the formation of gradient transition layer by inhibiting excessive reaction. Meantime, it can reduce the amount of hard particles and enhance the toughness of the composites. The ordered arrangement of cemented carbide particles can improve the hardness and wear resistance of high chromium cast iron. |
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