Investigation of the Dimensional Changes in Soft Metal Powder Compacts

Nazmy, M.; Abdel-Azim, M. S.

doi:10.1179/pom.1974.17.33.002

Cited by 6 publications

(1 citation statement)

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“…All these brazing materials reduce the total shrinkage of specimens and produce a swelling effect. This has often been attributed to the diffusion of brazing material into the base iron particles leaving its initial sites as large stable pores [16]. More recently, however, it has been shown [17] that the expansion observed in these compacts is due to the penetration of the molten brazing phase into the spaces between the base iron particles and some of the grain boundaries inside the particles.…”

Section: Fifth Asat Conferencementioning

confidence: 99%

EFFECT OF BRAZING ALLOYS ON MECHANICAL AND TR1BOLOGICAL BEHAVIOR OF Ni-MO SINTERED STEEL

Abdo¹,

Sallam

Gadallah

et al. 1993

International Conference on Aerospace Sciences and Aviation Tec

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The effect of three brazing materials on the mechanical and tribological characteristics of 0.8% C-4% Ni-0.5% Mo sintered steel was investigated. Different percentages of copper, cobalt base, and nickel base master alloys were blended with the other alloying powders of this steel. Compaction was done in a uniaxial floating dies under a compaction pressure of 600 MPa. Sintering was then carried out in a continuous vacuum atmosphere at 1150 °C for one hour. In the as sintered state the addition of 3.5% copper provides the highest strength and hardness while the addition of 5 % cobalt base master alloy offers the highest ductility and toughness. Stress strain diagrams of this steel show two distinct strain hardening coefficients compared with that obtained for the same steel without any brazing addition. This was attributed to the formation of brazing film on the surface of granules of different coefficient of strain hardening. Moreover, the addition of cobalt base and nickel base master alloys results in a pronounced improvement of the wear resistance of such steel. The application of a quenching and tempering heat treatment cycle proved to offer the steel with 5 % cobalt base master brazing alloy distinguished elevated mechanical characteristics and wear resistance.

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Section: Fifth Asat Conferencementioning

confidence: 99%