Novel microstructural growth in the surface of Inconel 625 by the addition of SiC under electron beam melting

被引:16
作者
Ahmad, M. [1 ]
Ali, G. [1 ]
Ahmed, Ejaz [1 ]
Haq, M. A. [1 ]
Akhter, J. I. [1 ]
机构
[1] Pakistan Inst Nucl Sci & Technol PINSTECH, Div Phys, Islamabad, Pakistan
关键词
Microstructure; Hardness; Electron beam method; Scanning electron microscopy (SEM); Energy dispersive X-ray spectroscopy (EDXS); X-ray diffraction (XRD); PRECIPITATION; HARDNESS;
D O I
10.1016/j.apsusc.2011.02.067
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Electron beam melting is being used to modify the microstructure of the surfaces of materials due to its ability to cause localized melting and supercooling of the melt. This article presents an experimental study on the surface modification of Ni-based superalloy (Inconel 625) reinforced with SiC ceramic particles under electron beam melting. Scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction techniques have been applied to characterize the resulted microstructure. The results revealed growth of novel structures like wire, rod, tubular, pyramid, bamboo and tweezers type morphologies in the modified surface. In addition to that fibrous like structure was also observed. Formation of thin carbon sheet has been found at the regions of decomposed SiC. Electron beam modified surface of Inconel 625 alloy has been hardened twice as compared to the as-received samples. Surface hardening effect may be attributed to both the formation of the novel structures as well as the introduction of Si and C atom in the lattice of Inconel 625 alloy. (C) 2011 Elsevier B. V. All rights reserved.
引用
收藏
页码:7405 / 7410
页数:6
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