Garcia P.,Centro Tecnologico del Acero y Materiales Metalicos |
Rivera S.,Centro Tecnologico del Acero y Materiales Metalicos |
Palacios M.,Centro Tecnologico del Acero y Materiales Metalicos |
Belzunce J.,University of Oviedo
Engineering Failure Analysis | Year: 2010
One of the main applications of brasses is the manufacture of fluid carrying systems. The shape of the final product is usually made by means of machining the rolled or extruded standard bars, so that effective and low cost machining operations are required. Leaded brasses are extensively used when a good machinability is required.Two leaded brasses bars (CuZn39Pb3 alloy) with the same geometry but with different behaviour in saw cutting operations have been characterized in this work. Chemical composition, mechanical and microstructural properties have been studied in order to clarify the observed differences during saw cutting machining.Significant differences have been found with respect to the size and distribution of lead globules and phase volume fractions (α+β′), that have been explained due to the existence of different solidification and cooling patterns in both products; being the lead distribution the most important characteristic relative to the leaded brass cutting performance. © 2009 Elsevier Ltd.
Rivera S.,Centro Tecnologico Del Acero y Materiales Metalicos |
Lezcano R.,Centro Tecnologico Del Acero y Materiales Metalicos |
Rodriguez C.,University of Oviedo |
Belzunce F.J.,University of Oviedo |
Betegon C.,University of Oviedo
Strain | Year: 2012
The typical heat-affected zone developed in an X-70 steel, usually used in pipeline manufacture, has been simulated via thermal treatment. A non-equilibrium microstructure consisting of bainite, with ferrite and some martensite, has been produced and mechanically characterised, resulting in much greater hardness and strength and a lower ductility and toughness than the corresponding base metal. This also has a lower ductility. Different single-edge notched bending specimens with different crack lengths (a/W between 0.1 and 0.5) were experimentally tested to assess the fracture behaviour of this product under different degrees of constraint. The J-a resistance curves at room temperature were determined, and the obtained results were explained by the effect of constraint on ductile crack growth. © 2011 Blackwell Publishing Ltd.