| LIN Liang-liang.Effect of Aluminum Content on Microstructure, Mechanical Properties and Milling Performance of Ti1-xAlxN Coatings[J],48(4):175-181 |
| Effect of Aluminum Content on Microstructure, Mechanical Properties and Milling Performance of Ti1-xAlxN Coatings |
| Received:January 21, 2019 Revised:April 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.04.025 |
| KeyWord:Ti1-xAlxN coatings nano-hardness nano-scratch mechanical properties milling properties |
| Author | Institution |
| LIN Liang-liang |
Xiamen Golden Egret Special Alloy Co., Ltd, Xiamen , China |
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| Abstract: |
| The work aims to study the effect of different Al contents on Ti1-xAlxN coating so as to obtain the TiAlN coating with the best properties in milling cast iron materials. Ti0.5Al0.5N and Ti0.33Al0.67N coatings with different Al contents were de-posited on WC-Co cemented carbide substrate by cathode arc evaporation, and the microstructure and element distribution of the coatings were characterized by XRD, SEM and EPMA. The property indexes including nano-hardness (H), indentation modulus (E), factor of plastic deformation resistance (H3/E*2), microhardness dissipation parameter (MDP) and scratch crack propagation resistance (CPRs) were measured by CSM nano-hardness tester and scratch instrument. The performance and wear mechanism of coated inserts with different Al contents in milling gray cast iron HT250 and nodular cast iron QT450 were compared. Both of Ti0.5Al0.5N and Ti0.33Al0.67N coatings were NaCl face-centered cubic structure with (200) preferred orientation. XRD peak high angle offset of coatings with more Al contents was larger than that of coatings with medium Al contents, indicating that coatings with more Al contents had higher solid aluminum solution. Compared with Ti0.5Al0.5N coating, the properties H3/E*2 of Ti0.33Al0.67N coating was smaller, while MDP and CPRs were larger, which indicated better plasticity, toughness and adhesion strength. In milling HT250 AND QT450, Ti0.33Al0.67N coated inserts had average service life of 30 and 60min and better cutting performance, compared with Ti0.5Al0.5N. For TiAlN coating, the mass fraction of Al increased to 67% can obtain better plasticity, toughness and adhesion and Ti0.33Al0.67N coated inserts exhibit more excellent cutting performance in milling HT250 and QT450. |
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