Influence of ECAP processing on mechanical and wear properties of brass alloy

Radhi, Hussein Naser; Mohammed, Mohsin Talib; Aljassani, Alaa M.H.

doi:10.1016/j.matpr.2020.12.461

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…According to the published studies, one of the main factors determining the final properties of brass products is structure morphology, grain size in particular (lower grain size affects positively the final properties). This hypothesis was also confirmed by the recent study by Naser Radhi et al [ 21 ] reporting significant improvement in mechanical properties of brass after processing via equal channel angular pressing (ECAP). ECAP is one of the severe plastic deformation methods based on introducing substantial grain refinement via imparting severe shear strain.…”

Section: Introductionsupporting

confidence: 75%

Effects of Temperature (In)homogeneity during Hot Stamping on Deformation Behavior, Structure, and Properties of Brass Valves

Kunčická

Kocich

2021

Adv Eng Mater

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Herein, assessing the effects of initial temperature (in)homogeneity on a hot‐stamped CuZn40Pb2 medical gas valve (fitting) via numerically and experimentally defining mutual relations of selected deformation parameters and optimizing temperature distribution within the original semi‐product heated via induction are focused. For these purposes, three preheating regimes are simulated, and deformation behaviors are evaluated. The predicted results are validated by experimental stamping and subsequent evaluation of the structure and properties of stamped fittings. The results show that preheating the semi‐product with a certain temperature gradient occurring between the axial and (sub)surface regions is favorable, as homogeneous initial temperature distribution results in rapid surface cooling by the effect of heat transfer from semi‐product to die, which imparts inhomogeneous stress distribution, local changes in structural phases, and possible occurrence of oxides. Too low (sub)surface temperature of the semi‐product can result in a significant (local) increase in flow stress, which consequently results in the danger of occurrence of forming defects. The brass fitting stamped with the optimized preheating procedure features an average grain size of 5.8 μm, uniform grains’ orientations with maximum texture intensity of two times random, and ultimate tensile strength of almost 400 MPa, while maintaining elongation to failure of more than 35%.

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Section: Introductionsupporting

confidence: 75%

Effects of Temperature (In)homogeneity during Hot Stamping on Deformation Behavior, Structure, and Properties of Brass Valves

Kunčická

Kocich

2021

Adv Eng Mater

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“…The research performed so far has documented that structure morphology-and grain size in particular-is the primary factor influencing the mechanical properties and final performance of brass products. The lower the grain size, the more positive the effect on the final properties, as also proven by a recent study documenting the effects of the equal channel angular pressing (ECAP) method on the mechanical properties of a brass [27]. ECAP is one of the severe plastic deformation (SPD) methods, which are based on imparting severe shear strain onto materials, with the aim of introducing significant grain refinementto the ultra-fine (UF) or nano scale-to enhance the final properties [28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 76%

Structural Factors Inducing Cracking of Brass Fittings

et al. 2021

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Cu–Zn–Pb brasses are popular materials, from which numerous industrially and commercially used components are fabricated. These alloys are typically subjected to multiple-step processing—involving casting, extrusion, hot forming, and machining—which can introduce various defects to the final product. The present study focuses on the detailed characterization of the structure of a brass fitting—i.e., a pre-shaped medical gas valve, produced by hot die forging—and attempts to assess the factors beyond local cracking occurring during processing. The analyses involved characterization of plastic flow via optical microscopy, and investigations of the phenomena in the vicinity of the crack, for which we used scanning and transmission electron microscopy. Numerical simulation was implemented not only to characterize the plastic flow more in detail, but primarily to investigate the probability of the occurrence of cracking based on the presence of stress. Last, but not least, microhardness in specific locations of the fitting were examined. The results reveal that the cracking occurring in the location with the highest probability of the occurrence of defects was most likely induced by differences in the chemical composition; the location the crack in which developed exhibited local changes not only in chemical composition—which manifested as the presence of brittle precipitates—but also in beta phase depletion. Moreover, as a result of the presence of oxidic precipitates and the hard and brittle alpha phase, the vicinity of the crack exhibited an increase in microhardness, which contributed to local brittleness.

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“…Numerous studies on the application of SPD processes on copper have reported a drastic improvement in properties. Wear property improvement in brass was reported after three ECAP pass in route C by Naser Radhi et al 15 Martynenko et al observed improved strength, ductility and conductivity in Cu-Cr and Cu-Fe alloys subjected to ECAP for four passes in route Bc. 3 Guo et al reported over 100% increase in tensile strength and hardness of single-crystal Cu subjected to four ECAP pass.…”

Section: Introductionmentioning

confidence: 87%

Investigation of microstructure and mechanical properties of Cu-Ni alloy processed by equal channel angular pressing

Sachin

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The Copper-Nickel alloy, C70600, was subjected to severe plastic deformation by the equal channel angular pressing (ECAP) technique. The material was pressed at room temperature along route BC for eight passes. Microstructural analysis and mechanical characterization of the material were done for each of the ECAP pass samples. The initial homogenized material having equiaxial grains of average grain size 75 µm was reduced to 20 µm after eight ECAP passes. Electron backscatter diffraction data presented an increase in low angle grain boundaries with an increase in the number of ECAP passes. Initially, the ultimate tensile strength and the hardness increased by 56% and 94% respectively. After the fifth ECAP pass, a drastic reduction in ultimate tensile strength and ductility was witnessed. Hardness value remained constant after the fifth ECAP pass. Fractography analysis indicate the ductile mode of fracture with reduced dimple size at higher ECAP passes.

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Influence of ECAP processing on mechanical and wear properties of brass alloy

Cited by 11 publications

References 12 publications

Effects of Temperature (In)homogeneity during Hot Stamping on Deformation Behavior, Structure, and Properties of Brass Valves

Effects of Temperature (In)homogeneity during Hot Stamping on Deformation Behavior, Structure, and Properties of Brass Valves

Structural Factors Inducing Cracking of Brass Fittings

Investigation of microstructure and mechanical properties of Cu-Ni alloy processed by equal channel angular pressing

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