Effect of cooling rate on the quality of hard alloys

Mukha, I. M.; Globa, L. V.

doi:10.1007/bf00793864

Powder Metall Met Ceram

1971

DOI: 10.1007/bf00793864

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Effect of cooling rate on the quality of hard alloys

I. M. Mukha¹,

L. V. Globa²

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“…The authors of [12] associate this rise with increase in W content in Co and with an alloy structure, which is more homogeneous in terms of d WC values. The cooling rate during quenching in water and cooling in a furnace or in air did not alter the mechanical characteristics much but no explanation of this fact is offered in [12,13]. The large amount of dissolved tungsten and carbon in cobalt upon rapid cooling after sintering indicates that it is possible to quench sintered hard alloys.…”

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“…Quenching of hard alloys with Co V V = 10 and 22.5% from the temperature of sintering in oil (80-100 deg/min) raised the bending strength by 15% and the impact strength by 10-20% in comparison with usual conditions of cooling after sintering [12]. The authors of [12] associate this rise with increase in W content in Co and with an alloy structure, which is more homogeneous in terms of d WC values. The cooling rate during quenching in water and cooling in a furnace or in air did not alter the mechanical characteristics much but no explanation of this fact is offered in [12,13].…”

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Technological aspects of heat treatment of hard alloys in the sintered state

Loshak

Aleksandrova

2006

Powder Metall Met Ceram

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621.762Conditions and temperature and time parameters of quenching of hard alloy specimens and articles from tungsten group alloys have been studied. It is shown that the choice of quenching medium and temperature, holding time, and cooling rate is completely determined by the cobalt content in the alloy, the mass of the article to be quenched, and the presence of constructional stress concentrators. Quenching under optimal conditions increases the mechanical properties of the material, primarily its deformation characteristics under compression. This fact explains the longer service life of quenched components of high-pressure apparatuses, upsetting tools, dies, single-piece hard alloy drills, rockbreaking tools, etc. Keywords: hard alloy, quenching, heat treatment.Analysis performed by V. I. Tret'yakov [1] of the effect of various factors in hard alloy production technology on the strength and deformation characteristics of the alloys shows that the mechanical properties of alloys can be augmented by refining conventional powder production methods and improving compacted powder sintering conditions. In particular, elevation of tungsten carbidizing temperature to 2500 K facilitates marked increase (2-5 times) in the hard alloy deformation and disintegration work with some decrease in static strength [2]. Development of a two-stage sintering method [3] helps increase the homogeneity of hard-alloy articles in terms of carbon content. In this case, the alloys occur in the two-phase region at its upper carbon boundary. Sintering of articles in a controlled gas environment meets this very purpose [4].On the other hand, the established laws of change in the mechanical characteristics of hard alloys as a function of their structure and, in particular, of the properties of the structural components [5] facilitate development of methods for strengthening hard alloys already in the sintered state. For instance, limited solubility of tungsten and carbon in cobalt and presence of thermal stresses differing in sign in WC and Co phases indicate the possibility of altering the parameters of the structure by heat treatment.The possibility, in principle, of altering the properties of hard alloys by heat treatment stems from the works [3, 6, 7] where it has been shown that tungsten and carbon are soluble in cobalt to a limited extent in the solid state in the WC − Co pseudobinary system. Since the solubility of W and C in Co depends on temperature, the rate of cooling of alloys after sintering determines to a large measure the composition of the binding phase [8,9]. For instance, in the binding phase of the alloys containing 3-25 mass% Co and occurring in the two-phase region, the amount of rapidly cooled (100 deg/min) tungsten is 1.5-2.0 times higher than in slowly cooled (5 deg/min) alloys [8]. In this case, higher hardness and bending strength values at the same impact strength are typical for rapidly cooled alloys. In [10], upon rapid Institute of Superhard Materials, National Academy of Sciences of Ukraine, Kiev.

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confidence: 96%

Technological aspects of heat treatment of hard alloys in the sintered state

Loshak

Aleksandrova

2006

Powder Metall Met Ceram

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Mechanisms for the degradation of strength and wear-resistance of WC based cemented carbides due to faster cooling

Ponomarev¹,

Shatov²,

Михайлов³

et al. 2015

International Journal of Refractory Metals and Hard Materials

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Effect of cooling rate on the quality of hard alloys

Cited by 2 publications

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Technological aspects of heat treatment of hard alloys in the sintered state

Technological aspects of heat treatment of hard alloys in the sintered state

Mechanisms for the degradation of strength and wear-resistance of WC based cemented carbides due to faster cooling

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