| LIU Yong,WANG Ya-jun,YANG Yu-lin,YANG Qing-xiang.Influence of La2O3 on Microstructure and Wear Resistance of Crawler Belt Hardfacing Alloy Surface[J],46(3):113-118 |
| Influence of La2O3 on Microstructure and Wear Resistance of Crawler Belt Hardfacing Alloy Surface |
| Received:October 15, 2016 Revised:March 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.03.017 |
| KeyWord:crawler belt surfacing technology La2O3 microstructure wear-resistance |
| Author | Institution |
| LIU Yong |
Norinco Group Inner Mongolia First Machinery Group Co., Ltd, Baotou , China |
| WANG Ya-jun |
State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao , China |
| YANG Yu-lin |
State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao , China |
| YANG Qing-xiang |
State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao , China |
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| Abstract: |
| The work aims to develop a novel flux-cored wire with La2O3 for hardfacing armored car crawler belt and improve wear resistance of the hardfacing alloy layer by refining the microstructure. The hardfacing alloy layers were deposited by means of automatic open arc surfacing welding method. The microstructure was observed by using an optical microscopy. Meanwhile, Rockwell hardness and wear resistance of the hardfacing alloy surface were measured. The microstructure of the hardfacing alloy contained bainite, martensite and residual austenite. The average size of primary austenite was about 42 μm and mass loss of the La2O3-free alloy 6000 min/g. With La2O3 added, the average size of primary austenite was about 36 μm and mass loss 12300 min/g. The two-dimensional lattice misfit between the (001) face of LaAlO3 and (100) face of austenite was 3.81%. With La2O3, LaAlO3 as most effective γ-Fe heterogeneous nuclei, the primary austenite is refined and thereby the wear resistance of the hardfacing alloy layer can be improved as well. |
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