Short-term creep and creep limit on the base of 1�10 sec of technically pure tungsten and alloy of the system W-HfC-HfO2 at high temperatures

Bukhanovskii, V. V.; Kharchenko, V. K.; Povarova, K. B.; Zavarzina, E. K.; Ol'shanskii, A. B.

doi:10.1007/bf01523377

Cited by 5 publications

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“…The amount of accumulated experimental data on the mechanical properties of tungsten produced by PM technique [10][11][12][13] makes it possible to analyze them and establish correlation dependences between the characteristics of its short-term and long-term static strength and creep resistance. The experimental results considered refer to a high-temperature region (above 0 5…”

Section: Introductionmentioning

confidence: 99%

“…presents experimental data[10][11][12][13] on short-term strength of commercially pure PM tungsten (99.97 wt.% W) in the temperature range from 1770 to 2770 Ê, which corresponds to~(0.5-0.8)T melt , in the form of temperature dependences of the ultimate strength R m and the offset yield stress R p0 2 . .…”

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confidence: 99%

“…(5)and(6). The values of the coefficient n, which characterizes the slope of the curves for PM tungsten, are about 5.3[11,13]. Temperature dependences of the tensile ultimate strength, R m , offset yield stress, R p0 2 .…”

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confidence: 99%

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Correlation Dependences between Short-Term/Long-Term Static Strength Characteristics and Creep Resistance of Tungsten at High Temperatures

2005

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Experimental data on high-temperature mechanical properties under uniaxial tension of commercially pure tungsten obtained by powder metallurgy have been analyzed. It has been found that for powder metallurgy tungsten in the high-temperature region~, (0.5 0.8) − T melt there is a close correlation among the characteristics of short-and long-term static strengths and creep resistance, which are described by a single functional relation. Introduction.The progress in a number of branches of modern engineering is related to the use of refractory metals and alloys, which can ensure strength of components and structural elements operating under conditions of extremely high temperatures (up to 2300-3300 K) and mechanical loads. Tungsten and tungsten-based alloys have the most unique range of physico-mechanical characteristics including heat resistance [1][2][3].In addition to short-term strength, the characteristics of long-term static strength and creep are the most important factors characterizing serviceability of metals at high temperatures. Complete experimental evaluation of such characteristics for refractory materials presents great difficulties and is unrealistic in many cases.It is known that temperature dependences of various mechanical characteristics that determine the resistance of metallic materials to deformation are qualitatively similar. Under short-term and long-term static loading, there are correlation dependences between strength characteristics of metals and alloys, which can be described by certain analytical expressions based on both empirical and physically justified approaches. They are undoubtedly of scientific and practical interest, because they make it possible to evaluate heat-resistance characteristics of advanced structural materials at minimum cost [4,5].In the present study, based on the analysis of experimental data obtained earlier, a generalized correlation dependence has been established between the characteristics of high-temperature short-term and long-term static strength and creep resistance of commercially pure tungsten produced by powder metallurgy (PM) technique.Theoretical Background. On the basis of numerous experiments it has been found that temperature dependence of any mechanical characteristics, which determine the resistance of metallic materials to deformation, is described quantitatively by the following equation [4]:

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%