Metal science of platinum group metals

Novikov, I. I.; Rytvin, E. I.

doi:10.1007/bf00664218

Cited by 15 publications

(20 citation statements)

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“…1,2,4,8,9 It could be concluded that strain aging is a consequence of the next mechanisms as the diffusion of carbon and/or nitrogen interstitially solute atoms on the dislocations and block them with Cottrell atmospheres forming. 1,2,[10][11][12] This phenomenon could be explained by marked tendency on strain aging of the body centred cubic lattice metal (as tungsten) with low carbon content (,0 . 05%C).…”

Section: Results and Discussion Mechanical Propertiesmentioning

confidence: 99%

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Effects of strain aging on the structure and mechanical properties of PM 92·5W–5Ni–2·5Fe heavy alloys

Katavić¹,

Odanović²

2005

Powder Metallurgy

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paper describes the effects of strain aging on the mechanical properties and the microstructure of forged 92 . 5W-5Ni-2 . 5Fe and its heavy alloys microalloyed with cobalt. The investigation was performed on cold rotary forged rods deformed 15, 20 and 30% and strain aged at temperatures from 673 to 1273 K for 1 . 8-32 . 4 ks. The results show that for these alloys, there is a temperature range from 773 to 873 K in which maximum ultimate strength and hardness can be attained. Furthermore, the strain aged alloys have shown strength and hardness increase at a temperature of 973 K in a time period of 10 . 8 ks. The fracture analysis has shown the presence of predominant transgranular fracture of the tungsten phase and c-phase in the strain-aged alloys in comparison with the forged alloys. The results indicate that interface and tungsten phase strengthening are predominant mechanisms of strain aging.

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Section: Results and Discussion Mechanical Propertiesmentioning

confidence: 99%

“…05%C). 8,10 In the common W-Ni-Fe alloys, a maximal carbon content of ,0 . 02%C in the W-phase is achieved at the sintering temperature of 1723 K. The rest of the carbon is dissolved in the c-phase.…”

Section: Results and Discussion Mechanical Propertiesmentioning

confidence: 99%

Effects of strain aging on the structure and mechanical properties of PM 92·5W–5Ni–2·5Fe heavy alloys

Katavić¹,

Odanović²

2005

Powder Metallurgy

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“…It is known that the velocity of the phase boundary can be considered in first approximation inversely related to the carbon concentration difference on it. [8] For the value of this difference, the concentration should change to form a new phase. The carbon difference on the a-c grain boundaries is much less than on the c-h grain boundary; thus, austenite can be expected to grow much faster in the ferrite phase than in the cementite phase.…”

Section: B Temperature Range 1: a 1 < T < Amentioning

confidence: 99%

Microstructural Features of Austenite Formation in C35 and C45 alloys

Savran

Leeuwen²,

Hanlon

et al. 2007

Metall Mater Trans A

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The microstructural evolution during continuous heating experiments has been studied for two C-Mn steels with carbon contents in the range 0.35 to 0.45 wt pct using optical microscopy, scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). It is shown that the formation of the austenitic phase is possible in pearlite as well as in ferrite regions. Thus, a considerable overlap in time of ferrite-to-austenite and pearlite-to-austenite transformations is likely to occur. Another observation that was made during the experiments is that, depending on the heating rate, the pearlite-to-austenite transformation can proceed in either one or two steps. At low heating rates (0.05°C/s), ferrite and cementite plates transform simultaneously. At higher heating rates (20°C/s), it is a two-step process: first ferrite within pearlite grains transforms to austenite and then the dissolution of the cementite lamellae takes place. Several types of growth morphologies were observed during the experiments. The formation of a finger-type austenite morphology was noticed only for low and intermediate heating rates (0.05°C/s and 20°C/s), but not for the heating rate of 300°C/s. The formation of this fingertype austenite occurs on pearlite-ferrite grain boundaries and coincides with the direction of cementite plates. The carbon inhomogeneities in the microstructure affect the formation of martensitic/bainitic structures on cooling.

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“…As known, dislocation density is decreasing with temperature increasing [40][41][42][43]. In a given paper, to analyse the influence of the density of dislocation on the period, the experimental data of the temperature dependence of the density of dislocations and their approximation (by different processing conditions) are used (Ref.…”

Section: Thus the Fourier Component Of V-v-interaction Energies Alonmentioning

confidence: 99%

“…In a given paper, to analyse the influence of the density of dislocation on the period, the experimental data of the temperature dependence of the density of dislocations and their approximation (by different processing conditions) are used (Ref. [40][41][42][43]). One of such temperature dependence of the experimental data of density of dislocation on the temperature  0d (T), and its approximations is presented in figure 8 [43]: shows the  0d (T) dependence, which is obtained by extrapolation of a curve plotted with experimental data on a density of dislocations.…”

Section: Thus the Fourier Component Of V-v-interaction Energies Alonmentioning

confidence: 99%

The evolution of the nanoscale dissipative structures in a distribution of defects within the isothermally irradiated f.c.c. crystal

Tatarenko

Selyshchev

Oliinyk

et al. 2014

Philosophical Magazine

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Metal science of platinum group metals

Cited by 15 publications

References 0 publications

Effects of strain aging on the structure and mechanical properties of PM 92·5W–5Ni–2·5Fe heavy alloys

Effects of strain aging on the structure and mechanical properties of PM 92·5W–5Ni–2·5Fe heavy alloys

Microstructural Features of Austenite Formation in C35 and C45 alloys

The evolution of the nanoscale dissipative structures in a distribution of defects within the isothermally irradiated f.c.c. crystal

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