Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 488, Issue 1-2, Pages 562-568Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.11.082
Keywords
paste boriding; boride layers; fracture toughness; palmqvist cracks; microindentation tests
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Funding
- Consejo Nacional de Ciencia y Tecnologia at Mexico [53859]
- Secretaria de Investigacion y Posgrado of the Instituto Politecnico Nacional [20070130]
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The present study evaluates the fracture toughness on Fe(2)B borided layers. Formation of the layers was obtained by means of the paste boriding process on an AISI 1045 steel surface. The treatment was carried out at temperatures of 1123, 1171 1223 and 1273 K for 8 h using a 4 mm thickness layer of boron carbide paste over the material surface. A Vickers microhardness tester was used to generate microcracks under loads of 1.9. 2.9. 4.9 and 9.8 N at different indentation distances across the thickness of the iron boride layer. The applied loads and the crack lengths generated from the corners, of the indentations were set as the experimental parameters, Using two Palmqvist cracks models, for the evaluation of the fracture toughness. Finally. the fracture toughness results in the borided layers were analyzed based on the different distances from the surface, microindentation loads and the treatment temperatures of the paste boriding process. (C) 2008 Elsevier B.V. All rights reserved.
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