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Machinability
of powder metallurgy steels
Salek,
A; Selecka, M,; Danninger, H
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The Machinability of powder metallurgy steels is lower compared
with wrought steels of appropriate composition and/or mechanical
properties. This is due to a larger number of material and processing
variables affecting the final properties of sintered material.
Therefore, the machining of powder metallurgy steels is a permanent
subject of investigation and practice.
The aim of the book is to use present knowledge for an overview
of all interacting factors in the machining process, including
those applied for improving machinability. They include the
properties of basic plain iron and alloyed powders, various
additions, compacting and sintering conditions. The effect of
porosity, individual alloying elements and microstructure character
is considered.
The description of the basic machining process with their characteristics
of tool geometry belongs to the mentioned factors. High speed
steel, hard metal and other tools with their geometry as a part
of the cutting process are described in relation to sintered
powder materials. Machinability enhancers of PM steels, such
as S, MnS, MoS2 and others, and their chemical and physical
characteristics are given. An overview of the effect of various
machining aids used up to the present time for improving the
machinability of sintered plain iron, iron-carbon and steels
alloyed with Cu, Ni, Mo, Cr, Mn including powder forges steels
with very different mechanical properties and very different
microstructures, is analysed and summarised. The recommendations
for machining of various steels include the present knowledge
about the machinability of powder metallurgy steels.
ISBN 1-898326-82-7
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