Recrystallization controlled rolling and accelerated cooling for high strength and toughness in V-Ti-N steels |
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Authors: | Stanislaw Zajac Tadeusz Siwecki Bevis Hutchinson Mårten Attlegård |
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Affiliation: | 1. Mechanical Metallurgy Department, Swedish Institute for Metals Research, S-114 28, Stockholm, Sweden 2. Thermomechanical Processes and Properties, Mechanical Metallurgy Department, Swedish Institute for Metals Research, S-114 28, Stockholm, Sweden 3. Mechanical Metallurgy Department, Swedish Institute for Metals Research, S-114 28, Stockholm, Sweden 4. Svenskt St?l AB, Oxel?sund, Sweden
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Abstract: | Optimum thermomechanically controlled process parameters have been established for the production of Ti-V-N microalloyed high-strength
low-alloy (HSLA) steels. On the basis of laboratory simulation and full-scale processing, it has been shown that nitrogen
is an essential alloying element addition and full appreciation of its effects leads to the ability to utilize high nitrogen
steel in connection with hot rolling in a high-temperature regime to produce HSLA products with very favorable combinations
of yield strength and toughness. The effects of reheating temperature, rolling reduction, cooling rate, and finish-cooling
temperature (FCT) on the ferrite grain size and mechanical properties have been examined. It has been shown that the potential
for precipitation strengthening is dependent on vanadium, nitrogen, and cooling parameters. Accelerated cooling (ACC) prevents
precipitation of vanadium nitrides in austenite and enhances both grain refinement and precipitation strengthening. By adjusting
nitrogen content and processing parameters, a yield strength of 500 MPa and impact transition temperature (ITT) below -60
‡C can be obtained in the as-hot-rolled condition in Ti-V-N steels, using high finish-temperature hot rolling and accelerated
cooling. |
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