Microstructural Characterization of TiC–White Cast-Iron Composites Fabricated by In Situ Technique

Materials

AnaM. P. Pinto¹  LauraM. M. Ribeiro²  AidaB. Moreira²  RicardoO. Sousa²  ManuelF. Vieira²  Pedro Lacerda³ 

[1] CMEMS - Center for MicroElectroMechanics Systems, Department of Mechanical Engineering, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal;Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal;FERESPE - Fundição de Ferro e Aço Lda., Vila Nova de Famalicão, 4760-485 Fradelos, Portugal;

关键词: casting process;    high-chromium white cast iron;    in situ synthesis;    local reinforcement;    metal matrix composite;    microstructural characterization;    titanium carbide;   

DOI  :  10.3390/ma13010209

来源: DOAJ

【 摘 要 】

High-chromium white cast-iron specimens locally reinforced with TiC−metal matrix composites were successfully produced via an in situ technique based on combustion synthesis. Powder mixtures of Ti, Al, and graphite were prepared and compressed to fabricate green powder compacts that were inserted into the mold cavity before the casting. The heat of the molten iron causes the ignition of the combustion reaction of the reactant powders, resulting in the formation of the TiC by self-propagating high-temperature synthesis. The microstructure of the resultant composites and the bonding interfaces was characterized by scanning electron microscopy and energy dispersive spectroscopy (SEM/EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The microstructural results showed a good adhesion of the composite, suggesting an effective infiltration of the metal into the inserted compact, yet a non-homogeneous distribution of the TiC in the martensite matrix was observed. Based on the results, the in situ synthesis appears to be a great potential technique for industrial applications.

【 授权许可】

Unknown