Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 6

Influence of heat treatment parameters on the microstructure and mechanical properties of high-chromium GX12CrMoVNbN9-1 (GP91) cast steel

Grzegorz Golański

nr katalogowy: 56492

Development in the conventional power industry is tightly connected with aiming at raising the efficiency of power units (to the expected 50%) on the one hand, and at limiting the emission of pollutants, mainly CO2, SOx and NOx, to the atmosphere on the other hand. Increase in the power units efficiency requires raising the parameters of steam, i.e. temperature and pressure to the socalled super- or ultrasupercritical parameters. Raising the steam parameters was possible due to the development and implementation of two new groups of high-chromium materials of martensitic steels in the power industry, such as: T/P91, T/P92 or P122 steel and low alloy bainitic steels: T24 and T23 steel. High properties of the new-found steels were obtained thanks to the optimization of their chemical composition and microstructure [1÷4]. Along with the introduction of new martensitic and bainitic steel grades to the power industry it became necessary to work out new grades of steel with their properties exceeding the properties of low alloy cast steels applied so far, i.e. Cr-Mo-V or Cr-Mo cast steel. The demands which have been put to the new-found high-chromium cast steel grades were quite high, i.e.: the 100 000 hrs creep strength of 100 MPa at 600°C, good castability and weldability (similar to that of low alloy cast steels), through-hardening capability up to about 500 mm wall thickness and properties, such as: fracture toughness, low-cycle fatigue strength and long-term toughness corresponding at least to those of the low-alloys, ferritic cast steels used currently up to 565°C [5, 6]. The above requirements were fulfilled by the new grades of steel with their chemical composition being similar to that of high-chromium steels. These grades include steel casts such GX12CrMoVNbN9-1 or GX12CrMoWVNbN10-1-1 [5, 7]. The aim of the conducted investigation was determining the influence of heat treatment (hardening from the austenitizing temperature[...]

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