|
|||||
|
|
Microstructure evolution during surface alloying of ductile iron and austempered ductile iron by electron beam melting |
|
| Authors: | A Gulzar M Ahmad G Ali M Ajmal |
| Institution: | a Materials Division, Pakistan Institute of Nuclear Science & Technology, Nilore, Islamabad, Pakistan b Physics Division, Pakistan Institute of Nuclear Science & Technology, Nilore, Islamabad, Pakistan c Department of Metallurgical and Materials Engineering, University of Engineering & Technology, Lahore, Pakistan d Department of Chemical and Materials Engineering, Pakistan Institute of Engineering & Applied Sciences, Islamabad, Pakistan |
| Abstract: | Alloying and microstructural modification of surfaces by electron beam has become popular to tailor the surface properties of materials. Surface modification of as-received ductile iron, Ni-plated ductile iron and Ni-plated austempered ductile iron was carried out by electron beam melting to improve the surface properties. Martensitic structure evolved in the heat affected zone and ledeburite structure was produced in the molten zone of the ductile iron. Microhardness of the melted specimens enhanced considerably as compared to the as-received samples. However the microhardness of melted Ni-plated samples is lower than that of the unplated specimens. X-ray diffraction clearly revealed the formation of an austenite and Fe3C phases in the electron beam molten zone. The broadening of peaks suggests refinement of the microstructure as well as internal stresses generated during electron beam melting. |
| Keywords: | Ductile iron Ni-plating Electron beam melting Ledeburite structure Scanning electron microscopy Microhardness |
| 本文献已被 ScienceDirect 等数据库收录！ | |