| SU Chao-ran,LYU Chang-le,SHI Lu-bing,ZHANG Yong-qiang,WANG Wen-jian,LIU Qi-yue.Effect of Laser Dispersed Quenching on Wear and Damage Property of Ductile Iron[J],47(11):85-90 |
| Effect of Laser Dispersed Quenching on Wear and Damage Property of Ductile Iron |
| Received:August 09, 2018 Revised:November 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.11.013 |
| KeyWord:laser dispersed quenching ductile iron wear damage cracks |
| Author | Institution |
| SU Chao-ran |
1.State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu , China |
| LYU Chang-le |
1.State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu , China |
| SHI Lu-bing |
1.State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu , China |
| ZHANG Yong-qiang |
2.Chengdu Shidai Ruitong Co., Ltd, Chengdu , China |
| WANG Wen-jian |
1.State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu , China |
| LIU Qi-yue |
1.State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| The work aims to improve friction and wear properties of ductile iron by different laser surface dispersed quenching methods. Nd:YAG laser was applied to perform laser ring quenching, strip quenching, spot quenching and full quenching on the surface of ductile iron disc specimen. The microstructure and surface hardness distribution of the ductile iron materials were analyzed after treated. Pin-Disc friction and wear tester was used to explore the wear and damage of ductile iron by different laser quenching methods. The martensite white layer was formed on the surface of ductile iron after laser dispersed quenching. The surface hardness was increased by about 62.7% to 93.8%, and the depth of the hardening layer by different treatment methods was similar, about 55 μm. The wear loss of ductile iron samples was reduced by more than 99% after laser dispersed quenching. Material removed destructively on the surface of untreated sample resulted in severe damage. The surface damage of treated specimens was relatively slight and the dominant form of wear was small spalling and fatigue wear. The ability of ductile iron to resist crack initiation after laser treated was enhanced and the length of profile cracks was obviously reduced. The surface hardness, wear resistance and damage resistance of the ductile iron after laser quenching of different methods have been significantly im-proved. Different quenching methods have different effects. Laser spot quenching has the best effect and small wear. Cracks in the section are small and difficult to expand to the material. |
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