Comparative study of the parameters influencing the machinability of leaded brasses

Garcia, Pedro Soucasaux Pires; Rivera, Sergio; Palacios, Marta; Belzunce, F. J.

doi:10.1016/j.engfailanal.2009.08.012

Cited by 68 publications

(46 citation statements)

References 2 publications

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“…Improved machinability minimizes tool wear and allows for the production of high precision components, exhibiting superior surface finish. Machinability/microstructure relationships, together with some reference of the mechanical properties of leaded brass alloys, have been previously studied and presented in the relevant literature [1][2][3][4]. The evaluation of mechanical properties and the relevant fracture mechanisms of machinable brass rods is a valuable subject for investigation, as the mechanical performance of brass components impacts the reliability and safety of the entire system.…”

Section: Introductionmentioning

confidence: 99%

Fracture Modes and Mechanical Characteristics of Machinable Brass Rods

Pantazopoulos¹,

Toulfatzis²

2012

Metallogr. Microstruct. Anal.

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Machinable brasses are a broad class of high strength copper-zinc alloys mainly containing lead to improve machinability. Conventional leaded brasses are widely used in several manufacturing sectors (i.e., fabrication of hydraulic components, fittings, valves, etc.) due to their superior workability in extrusion and drawing, together with their superior machinability for high efficiency production of final components in high speed/high precision machining centers. In addition to machinability, the mechanical behavior and general fracture mechanisms of these alloys are also important, due to their impact on the overall reliability and safety of brass components. In this study, the main fracture modes and mechanical characteristics of two industrial copper alloys, namely, CuZn39Pb3 and CuZn36Pb2As, are presented in relation to their microstructure. Optical metallography, macro-and microfractography, together with static and dynamic mechanical testing, were used as the principal analytical techniques for the present investigation.

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Section: Introductionmentioning

confidence: 99%

Fracture Modes and Mechanical Characteristics of Machinable Brass Rods

Pantazopoulos¹,

Toulfatzis²

2012

Metallogr. Microstruct. Anal.

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“…2-5 mass% lead is added to the traditional brass to improve its machinability. [1][2][3] Unfortunately, lead addition in the materials was found to cause severe hazard to environment and human health. 4,5) Bismuth (Bi), silicon (Si), selenium (Se), and graphite particles as alternative elements to lead have been discussed to improve machinability of brass.…”

Section: Introductionmentioning

confidence: 99%

Development of Lead-Free Machinable Brass with Bismuth and Graphite Particles by Powder Metallurgy Process

Imai

Atsumi

et al. 2010

Mater. Trans.

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The aim of this paper was to produce a lead-free machinable brass dispersed with bismuth and graphite particles by powder metallurgy process. The effect of the machinable elements on the elongation and machinability of extruded materials was investigated. The Cu-40 mass%Zn (Cu-40Zn) brass powder with 0$3:23 mass% bismuth additions were produced by rapid solidification process, having a mean particle size of 150 mm. It was found that bismuth were uniformly dispersed as the island of about 5 um in the brass powder matrix, and appeared at the brass powder surface after heat treatment over the melting point of bismuth. When 2.2 mass% or more bismuth was added, the quantity of bismuth appearing at the brass powder surface increased because of saturated quantity of bismuth elements in the brass powder. There were bismuth islands of tens of microns in the extruded brass with 2.2 mass% or more bismuth addition. These bismuth islands were depressed the elongation of extruded materials. The graphite particles with mean particle size of 5 mm were also used as raw powder. 0$0:5 mass% graphite particles were mixed with the as-atomized brass powder by dry process. The elongation of the extruded brass alloy with both bismuth and graphite particles additions increased comparing with that of extruded brass with bismuth addition. The extruded brass using the as-atomized brass powder with 2.2 mass% bismuth and 0.5 mass% graphite particles indicated excellent machinability as well as the conventional leaded brass. Synergy effect of bismuth and graphite particles on the improvement of elongation and machinability of brass alloys was much useful compared with the brass containing only bismuth or graphite particles.

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“…Lead is practically insoluble in solid copper and appears as a dark particle in the structure. 11 In order to identify lead, the samples were examined under a digital optical microscope-magnification 10009. Figure 5 shows the typical equiaxial grain morphology structure of brass samples and highly insoluble Pb as a dark particle.…”

Section: Results and Discussion From Optical Microscopementioning

confidence: 99%

Investigation of the Distribution of Lead in Three Different Combinations of Brass Feedstock

Bagherian

Fan

Cooper³

et al. 2016

Inter Metalcast

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The main objective of this paper was to assess three leaded brass samples (pending application with Copper Development Association) using optical microscopy and mass spectrometry to compare the distribution of lead. Based on the mass spectrometry data, a great deal of variation was not found within each of the samples based on five different sample locations. Optical microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy confirmed that the lead was homogenously distributed in brass.

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Comparative study of the parameters influencing the machinability of leaded brasses

Cited by 68 publications

References 2 publications

Fracture Modes and Mechanical Characteristics of Machinable Brass Rods

Fracture Modes and Mechanical Characteristics of Machinable Brass Rods

Development of Lead-Free Machinable Brass with Bismuth and Graphite Particles by Powder Metallurgy Process

Investigation of the Distribution of Lead in Three Different Combinations of Brass Feedstock

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