Abstract
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. 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. 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%. 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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