|
|||||
|
|
Characteristics of cobalt-based alloy coating on tool steel prepared by powder feeding laser cladding |
|
| Authors: | Chengyun Cui Zuoxing Guo Yuhua Liu Qiongqiong Xie Zheng Wang Jiandong Hu Yuan Yao |
| Affiliation: | aThe Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130025, China bChina FAW Group Corporation R&D Center, No.3013 Heping Street, Changchun 130011, China |
| Abstract: | Co-based alloy coating was deposited on tool steel by powder feeding laser cladding. Sections of such coatings were examined to reveal their microstructures and phases using scanning electron microscope (SEM) and X-ray diffractometer (XRD). The results showed that the prime phase (γ-Co dendrite) and other phases, including Cr23C6, Co7W6, and CrNi existed in the coatings. Some different solidification morphologies, such as planar (at the interface), cellular and dendrite formed, varying from the interface to the surface. Fine microstructures of γ-Co dendrite and lamellar eutectic in dendritical regions strengthened the coatings. Besides, the effects of aged treatment on the microstructure and microhardness of the surface coating were studied. Aged treatment led to the precipitations of some carbide particles (Cr7C3 and Co3C) and boride particles (Co4B) from the cladded coating, causing an increase in microhardness in the laser-cladded coating. |
| Keywords: | Tool steel Eutectic White layer |
| 本文献已被 ScienceDirect 等数据库收录！ | |