期刊
INTERNATIONAL JOURNAL OF MATERIAL FORMING
卷 3, 期 -, 页码 801-804出版社
SPRINGER FRANCE
DOI: 10.1007/s12289-010-0891-0
关键词
Thermal spraying; Laser surface hardening; WC-CoCr; Tooling
类别
资金
- Office of the Vice-President of Research, Dublin City University
In this work the affects of laser characteristics on microstructure and microhardness of high velocity oxygen fuel sprayed (HVOF) WC-CoCr coatings were investigated. The coating was deposited with a Sulzer Metco WokaJet (TM)-400 kerosene fuel and the laser surface treatments were applied using CO2 laser with 10.6 mu m wavelength. Large variations in surface properties were produced from variation in the laser processing parameters. In total, four levels of peak power (100, 200, 300 and 350 W), four levels of spot diameter (0.2, 0.4, 0.6 and 1 mm) and three levels of pulse repetition frequency (PRF) were investigated. An initial set of tests were followed by a more detailed 33 factorial design of experiments. Pulse repetition frequency and duty cycle were set in order to maintain the same overlap in the x and y directions for the raster scanned sample spot impact dimensions. Overlaps of 30% were used in the initial tests and 10% in the more detailed trials. The results have shown that care must be taken to keep the irradiance at a relatively low level compared to uncoated surfaces. High irradiance can in this case result in rough and porous surfaces. Lower levels of irradiance are shown to provide more uniform microstructures, reduced porosity and increased microhardness.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据