Effect of green machining on the tensile properties and fatigue strength of powder metallurgy sinter-hardenable steel components

Desbiens, Jean; Robert-Perron, Etienne; Blais, Carl; Chagnon, François

doi:10.1016/j.msea.2012.03.054

Cited by 17 publications

(5 citation statements)

References 3 publications

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“…Furthermore, according to Desbiens et al [13], interestingly, both the yield strength and ultimate strength of sintered PM components are increased by 18% and 9%, respectively, when machined in the green state. In addition, Robert-Perron et al [14] found that PM components prepared by green machining followed by sintering were accurate enough to meet requirements because only 0.33% dimensional variation was measured after sintering.…”

Section: Introductionmentioning

confidence: 94%

Material Removal Mechanism of Green Machining on Powder Metallurgy Parts during Orthogonal Cutting

Yang

Wan

2020

Advances in Materials Science and Engineering

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Due to its energy-saving and cost-reducing characteristics, a novel green machining technique for powder metallurgy (PM) parts is attracting increasing concern. Unlike in the traditional PM machining technique, in the PM green-machining method arranges, the processing operation is performed before sintering. Since the pristine PM compacts are relatively soft because it just bonds the particles together, direct cutting on pristine PM compacts is a tool-saving and cost-effective manufacturing technique and its cutting mechanism is different from that of both solid plastic metals and conventional brittle materials because of the special characteristics of a discontinuous material. The influences of cutting parameters on machined surface roughness are investigated by orthogonal cutting experiments. The results show that the machined surface roughness decreases with increasing cutting thickness and rounded cutting edge radius and slightly increases with increasing rake angle. It is suggested that these results are contrary to the long-held notions of machined surface roughness. Moreover, a geometric model illustrating the PM green-machining process was established to reveal the mechanism of material removal and machined surface formation. This model shows that the material removal of PM is composed of particle shearing deformation, peeling, and ploughing/extruding. Finally, this machining model was validated through observations of machined surface morphology and chip morphology.

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Section: Introductionmentioning

confidence: 94%

Material Removal Mechanism of Green Machining on Powder Metallurgy Parts during Orthogonal Cutting

Yang

Wan

2020

Advances in Materials Science and Engineering

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“…Compared to wrought counterparts with the same composition, PM steels with porosity values ranging from 3 to 15 vol.% have lower mechanical properties. [11][12][13] Press and sinter (P&S) processing route is typically applied for high-volume production with part weighing up to 1-2 kg. In this process, density gradient throughout the sample from surface to core is caused by the friction between die walls, punches, and metal particles, thus featuring directional properties.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to wrought counterparts with the same composition, PM steels with porosity values ranging from 3 to 15 vol.% have lower mechanical properties. 11–13…”

Section: Introductionmentioning

confidence: 99%

Consolidation of water-atomized chromium–nickel-alloyed powder metallurgy steel through novel processing routes

Nagaram,

Sundaram,

Gårdstam

et al. 2024

Powder Metallurgy

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When processing powder metallurgy (PM) steels, the conventional press and sinter route can reach a relative density up to 95%, which is insufficient for applications when dynamic mechanical performance is critical. In this study, a novel route is demonstrated consisting of cold isostatic pressing (CIP) followed by sintering and capsule-free hot isostatic pressing (HIP), allowing to achieve full density PM steels. Water-atomized steel powder admixed with 2 wt.% Ni was subjected to CIP and followed by sintering in 90N2/10H2 atmosphere at 1120 and 1250°C, and in vacuum (10−2 mbar) at 1250 and 1350°C, respectively. At the highest explored CIP pressure of 600 MPa, the three high-temperature sintering runs at 1250°C in 90N2/10H2 atmosphere and vacuum, and 1350°C in vacuum resulted in relative density of ∼94% and closed surface pores. This condition with necessary closed porosity then allowed subsequent capsule-free HIP after sintering, resulting in full densification of the components.

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“…Robert-Perron et al (2007-b) studied the machining behavior of green PM components during drilling and stated the necessity of optimization of the cutting parameters. Desbiens et al (2012) characterized the green machining effect on the tensile and fatigue strength of sinter-hardened steel components. Czampa et al (2013) studied the machinability performance of the sintered parts comprising Fe-Cu-C by drilling tests.…”

Section: Introductionmentioning

confidence: 99%

Factors Influencing the Machinability during Turning Sinter-Hardened Cu-Ni-Mo Based Steel: Dependency on Cutting Speed, Feed Rate, and Cutting Depth

Üllen

Hasak

Dirikolu

2020

Journal of Engineering Research is an international, peer-revie

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Machinability of sintered parts is a complex phenomenon influenced by a number of factors, including workpiece and tool properties, cutting conditions, and cutting parameters. A better understanding of the influence of all these parameters on the machinability of sinter-hardened Cu-Ni-Mo based steels is essential. This work uses an output matrix of surface roughness, chip formation, cutting forces, and tool wear to assess the machinability of sintered parts. Cutting speeds of 50, 150, and 250 m/min, feed rates of 0.05, 0.1, and 0.15 mm/rev, and cutting depths of 0.2, 0.4, and 0.6 mm were systematically used as cutting parameters. The results indicated that short spiral chips were formed in all cutting parameters and that the higher feed rates and cutting depth increase the forces and deteriorate surface quality. The increase in cutting speed increases the forces, while linearly decreasing the tool life; however, it has a positive effect on the surface finish.

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Effect of green machining on the tensile properties and fatigue strength of powder metallurgy sinter-hardenable steel components

Cited by 17 publications

References 3 publications

Material Removal Mechanism of Green Machining on Powder Metallurgy Parts during Orthogonal Cutting

Material Removal Mechanism of Green Machining on Powder Metallurgy Parts during Orthogonal Cutting

Consolidation of water-atomized chromium–nickel-alloyed powder metallurgy steel through novel processing routes

Factors Influencing the Machinability during Turning Sinter-Hardened Cu-Ni-Mo Based Steel: Dependency on Cutting Speed, Feed Rate, and Cutting Depth

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