Conclusions
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1.
The best properties of the tungstenless steels are exhibited by 95Kh6M3F3T0.4 (V/C≅3) With V/C≅4 there is a reduction in secondary hardness and red hardness for this steel, but with a reduction in titanium content from 0.4 to 0.2% secondary hardness does not change, but red hardness decreases. It is confirmed that an increase in molybdenum content from 3 to 5% does not improve steel properties and therefore it is not rational.
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2.
After oil quenching from 1225–1250°C and three-stage tempering at 540–550°C for 1 h each steel 95Kh6M3F3T0.4 is not surpassed by steel R6M5 in secondary hardness, red hardness, impact strength, and bending strength.
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3.
The high properties of steel 95Kh6M3F3T0.4 are governed by the almost identical degree of solid solution alloying as with steel R6M5. The total content of carbide-forming elements in martensite after quenching these steels is 10–11%.
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4.
With cooling at a rate from 3000 to 3°K/min steel 95Kh6M3F3T0.4 only experiences martensitic transformation. Isothermal decomposition of supercooled austenite for this steel commences with intense carbide precipitation, after which there is polymorphic γ → α-transformation.
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Literature cited
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Additional information
I. P. Bardin Central Scientific-Research Institute of Ferrous Metallurgy (TsNIIChERMET), N. É. Bauman Higher Technical School, Special Design Office of Textile Machinery ‘Kristall’, Academy of Sciences of the Azerbaijan SSR. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 43–47, May, 1988.
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Lanskaya, K.A., Rakhshtadt, A.G., Suleimanov, N.M. et al. Effect of alloying on the properties and heat treatment of low-alloy tungstenless high-speed steel 95Kh6M3F3T. Met Sci Heat Treat 30, 370–375 (1988). https://doi.org/10.1007/BF00701049
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DOI: https://doi.org/10.1007/BF00701049