利用横流CO2激光器在TA15钛合金表面通过优化的激光熔覆工艺制备出原位自生的多种颗粒增强钴基复合涂层,以增强表面的耐磨性和硬度.利用X射线衍射(XRD)、金相、扫描电镜(SEM)、硬度测试机和磨损试验机等方法对熔覆层进行分析.结果表明,熔覆层的显微结构主要由γ-Co、α-Ti固溶体和弥散分布的原位自生TiB2,、Cr5Si3,、TiC、WB、SiC、Co3Ti、NiC颗粒组成,这些多种颗粒增强相弥散分布在细小的树枝晶组织之间.熔覆层的显微硬度比基体提高很多,HV达到10000 MPa左右,约为基体硬度的3倍.与钛合金相比,熔覆层的耐磨性也有显著提高,其磨损率约为钛合金的1/12.熔覆层的磨损机理具有粘着磨损和磨粒磨损的混合特征.
参考文献
| [1] | Schutz RW.;Watkins HB. .Recent developments in titanium alloy application in the energy industry[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):305-315. |
| [2] | Zhou YG;Zeng WD;Yu HQ .An investigation of a new near-beta forging process for titanium alloys and its application in aviation components[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):204-212. |
| [3] | WANG Ming-wei,ZHANG Li-wen,PEI Ji-bin,LI Chen-hui,ZHANG Fan-yun.Effect of temperature on vacuum hot bulge forming of BT20 titanium alloy cylindrical workpiece[J].中国有色金属学会会刊（英文版）,2007(05):957-962. |
| [4] | Liu Yong;Zhu Jingchuan .Effects of triple heat treatment on stress relaxation resistance of BT20 alloy[J].Mechanics of materials,2008(10):792-795. |
| [5] | Sun RL.;Guo LX.;Dong SL.;Yang DZ. .Laser cladding of Ti-6Al-4V alloy with TiC and TiC plus NiCrBSi powders[J].Surface & Coatings Technology,2001(2/3):307-312. |
| [6] | Candel, J.J.;Amigó, V.;Ramos, J.A.;Busquets, D. .Sliding wear resistance of TiC_p reinforced titanium composite coating produced by laser cladding[J].Surface & Coatings Technology,2010(20):3161-3166. |
| [7] | CAI Lifang,ZHANG Yongzhong,SHI Likai.Microstructure and formation mechanism of titanium matrix composites coating on Ti-6Al-4V by laser cladding[J].稀有金属(英文版),2007(04):342-346. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%