2008
DOI: 10.1007/s11106-008-9021-7
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Factors influencing the machinability of sintered steels

Abstract: The machinability of powder metallurgy materials is considered to be poor. The main factors that deteriorate the machining of PM parts are introduced in this work. They are those which participate in different ranges and modes in the formation of a sintered body with required mechanical and other characteristics. The effect of base iron powders, alloying systems, and alloying elements, as well as the effect of processing routes, especially solid-state sintering, are mentioned. The characteristic heterogeneous … Show more

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Cited by 26 publications
(14 citation statements)
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“…Also, there are many 3D shapes and geometries that are difficult or almost impossible to produce by conventional forming technologies [2] without secondary machining, e.g., slots, bevels, blind holes, threads, cross-holes, and re-entrants normal to the pressing directions. At present, about half of the components produced by powder metallurgy parts require secondary machining operations [6]. New microfabrication technologies, such as micromilling and laser micromachining [7], opened new technological possibilities in porous material geometry modification by allowing a superior control of surface roughness and even porosity closure amount.…”
Section: Introductionmentioning
confidence: 99%
“…Also, there are many 3D shapes and geometries that are difficult or almost impossible to produce by conventional forming technologies [2] without secondary machining, e.g., slots, bevels, blind holes, threads, cross-holes, and re-entrants normal to the pressing directions. At present, about half of the components produced by powder metallurgy parts require secondary machining operations [6]. New microfabrication technologies, such as micromilling and laser micromachining [7], opened new technological possibilities in porous material geometry modification by allowing a superior control of surface roughness and even porosity closure amount.…”
Section: Introductionmentioning
confidence: 99%
“…However, a more in-depth analysis reveals that common industrial practice requires that large fractions of PM parts are subjected to finish machining before final assembly [5]. While in the past it was estimated that approximately 30 per cent of the PM structural components produced for the automotive industry involve at least some form of machining [18], more recent studies indicate that nearly half of the PM components require secondary machining operations [19]. Among them, drilling, turning, milling, and boring are typically used to bring the part to its final shape, since dimensional stability and surface finish of the sintered PM components is relatively difficult to control through the primary forming technology used to produce them.…”
Section: Macroscale Machining Of Metallic Pm Materialsmentioning
confidence: 99%
“…A comprehensive study on machinability of the PM steels has been recently published by Salak et al [29] and it was later reviewed by Alizadeh [19]. In these works, the authors argue for the existence of factors that either decrease or increase the machinability of sintered steels.…”
Section: Machinability Indexmentioning
confidence: 99%
“…To further reinforce the ubiquity of secondary machining operations in the context of powder metallurgy components, Alizadeh 6 pointed out that approximately half of these parts will require some form of secondary material removal operation. The size of the components produced from porous titanium varies between large limits, but many of them, especially those intended for biomedical purposes, tend to be relatively small in size.…”
Section: Introductionmentioning
confidence: 99%