Effects of Size and Volume Fraction of Carbide Particles on Strength and Fracture Toughness of P/M High Speed Steel

Autor:	Tomohisa Nishida, Yoshiharu Mutoh, Nobuhiro Tsujii
Rok vydání:	1992
Předmět:	Materials science Mechanical Engineering Condensed Matter Physics Carbide Fracture toughness Flexural strength Mechanics of Materials Ultimate tensile strength Volume fraction Particle General Materials Science Particle size Composite material High-speed steel
Zdroj:	Journal of the Society of Materials Science, Japan. 41:1403-1409
ISSN:	1880-7488 0514-5163
DOI:	10.2472/jsms.41.1403
Popis:	Fracture toughness tests of P/M high speed steels with different carbide sizes were carried out by using three point bend specimens with fatigue precrack. Tensile and bending strength tests were also carried out. The heat treatment to control the size of carbide particle also resulted in the change of volume fraction of carbide particles: the volume fraction of carbide particles decreased with an increase in the size of carbide particle. These two competitive factors, the size and volume fraction of carbide particles, simultaneously influenced the fracture toughness of the product in such a way that smaller size and higher volume fraction result in lower fracture toughness. Tensile and bending strengths increased with reducing the size of carbide particle. In the tensile and bending tests, fracture occurred from the site where some carbide particles or inclusions were segregated. Since the size of the initiation site was in proportion to the size of carbide particle, it is apparent that the both strengths increased with reducing the carbide particle size.
Databáze:	OpenAIRE
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