ISSN:
1573-8973
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. Microalloying of the 14Kh2GMR steel with REM master alloy disperses the nonmetallic inclusions and changes their composition and morphology. Here the total content of nonmetallic inclusions changes insignificantly. 2. Carbonitride-forming elements (Ti, V and Nb) help to reduce the size of the austenite grain and the bainite structure of steel, but addition of niobium proves to be the most effective. High-melting compounds, formed by REM master alloy with steel added, retard grain growth at high temperature (1300°C) after dissolving in austenite carbides and vanadium carbonitrides, niobium, titanium and aluminum nitrides. 3. In complex microalloying with carbonitride-forming elements, the strength of steel increases by 200 N/mm2; however, in this case plasticity and impact strength decrease and the half-brittleness tempeature T50 rises. The best combination of mechanical properties is realized in complex microalloying of steel with Ti, V, Nb and REM master alloy: the class of steel strength increases from KP60 to KP80 retaining the plasticity and resistance to brittle fracture at a permissible level. 4. The microalloyed 12Kh2GMFBRChA steel is used for the manufacture of compressor machinery parts instead of the nickel-containing steels.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00738145
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