Manufacturing of functionally graded PM materials for hot work tools

authored by: Bernd Arno Behrens, Najmeh Vahed, Helmut Brand, Kai Uwe Volker
Abstract: This work is focused on increasing the local wear resistance of PM components by producing an adapted hard material gradient in highly stressed areas. The production principles are investigated by axial pressing and sintering of cylindrical specimens. The gradients are produced through a graded dispersion of tungsten carbide in a ductile matrix powder. In subsequent experiments, wear resistant graded forging dies are fabricated consisting of alloyed steel as a ductile base material and a gradient of fused tungsten carbide (FTC). In order to achieve a full compaction and sufficient mechanical properties, the graded die is manufactured by hot isostatic pressing. Using the near-net-shape approach, a solid mold element is applied during pressing to form the die contour geometry in the graded powder bulk. Thereby, the gradient structure can be produced parallel to the die contour and an excessive material removal through final machining is avoided.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
External Organisation(s): Bodycote Heiß-Isostatisches Pressen GmbH
Forschungsgemeinschaft Werkzeuge und Werkstoffe e.V.
Type: Conference contribution
Publication date: 01.01.2014
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Surfaces and Interfaces, Metals and Alloys, Surfaces, Coatings and Films
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{3603a1f650084fd38b7bede114f10c83,
title = "Manufacturing of functionally graded PM materials for hot work tools",
abstract = "This work is focused on increasing the local wear resistance of PM components by producing an adapted hard material gradient in highly stressed areas. The production principles are investigated by axial pressing and sintering of cylindrical specimens. The gradients are produced through a graded dispersion of tungsten carbide in a ductile matrix powder. In subsequent experiments, wear resistant graded forging dies are fabricated consisting of alloyed steel as a ductile base material and a gradient of fused tungsten carbide (FTC). In order to achieve a full compaction and sufficient mechanical properties, the graded die is manufactured by hot isostatic pressing. Using the near-net-shape approach, a solid mold element is applied during pressing to form the die contour geometry in the graded powder bulk. Thereby, the gradient structure can be produced parallel to the die contour and an excessive material removal through final machining is avoided.",
keywords = "Functionally graded materials, Hot isostatic pressing, Powder metallurgy, Wear resistant materials",
author = "Behrens, {Bernd Arno} and Najmeh Vahed and Helmut Brand and Volker, {Kai Uwe}",
year = "2014",
month = jan,
day = "1",
language = "English",
series = "Euro PM 2014 Congress and Exhibition, Proceedings",
publisher = "European Powder Metallurgy Association (EPMA)",
booktitle = "Euro PM 2014 Congress and Exhibition, Proceedings",
note = "Euro PM 2014 International Conference and Exhibition ; Conference date: 21-09-2014 Through 24-09-2014",
}