Browsing by Author "Dudziak, T."

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    Analysis of high temperature steam oxidation of superheater steels used in coal fired boilers
    (Springer, 2015-10-30) Dudziak, T.; Lukaszewicz, Mikolaj; Simms, Nigel J.; Nicholls, John R.
    The present work compares the behaviour of four steels: (T23, T92, T347HFG, Super304H) in the temperature range 600–750 °C. This study focuses on the analysis of the oxidation kinetics in terms of mass change, metal loss and thickness change of the selected materials. In order to understand the differences in oxidation rates between the selected steels, the impact of chromium and the alloying elements were considered in this work. The obtained results show that the impact of alloying elements differs with exposure conditions and importance of the synergy effect.
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    Fireside corrosion degradation of ferritic alloys at 600°C in oxy-fired conditions
    (Elsevier, 2013-11-19) Dudziak, T.; Hussain, T.; Simms, Nigel J.; Syed, A. U.; Oakey, J. E.
    This paper reports the results of a study carried out to investigate the effects of simulated coal/biomass combustion conditions on the fireside corrosion. The 1000 h deposit recoat exposure (5 × 200 h cycles) was carried out at 600 °C. In these tests ferritic alloys were used 15Mo3, T22, T23 and T91. Kinetics data were generated for the alloys exposed using both traditional weight change methods and metal loss measurements. The highest rate of corrosion based on EDX results occurred under D1 deposit where provoke mainly by the formation of alkali iron tri-sulphate phase.
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    High-temperature performance of ferritic steels in fireside corrosion regimes: temperature and deposits
    (Springer, 2016-11-17) Dudziak, T.; Hussain, Tanvir; Simms, Nigel J.
    The paper reports high temperature resistance of ferritic steels in fireside corrosion regime in terms of temperature and deposits aggressiveness. Four candidate power plant steels: 15Mo3, T22, T23 and T91 were exposed under simulated air-fired combustion environment for 1000 h. The tests were conducted at 600, 650 and 700 °C according to deposit-recoat test method. Post-exposed samples were examined via dimensional metrology (the main route to quantify metal loss), and mass change data were recorded to perform the study of kinetic behavior at elevated temperatures. Microstructural investigations using ESEM-EDX were performed in order to investigate corrosion degradation and thickness of the scales. The ranking of the steels from most to the least damage was 15Mo3 > T22 > T23 > T91 in all three temperatures. The highest rate of corrosion in all temperatures occurred under the screening deposit.
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    Impact specimen geometry on T23 and TP347HFG steels behaviour during steam oxidation at harsh conditions
    (Taylor and Francis, 2016-05-26) Dudziak, T.; Lukaszewicz, Mikolaj; Simms, Nigel J.; Nicholls, John R.
    Ferritic T23 steel and austenitic TP347HFG steel have been studied with an emphasis on understanding the impact of specimen geometry on their steam oxidation behaviour. The selected materials were tested over a wide range of temperatures from 600 to 750°C. The tests were carried out in 100% steam conditions for 1000 hours. The tests indicated that the ‘curved-shaped’ specimens show slower mass gain, scale ticking and void nucleation rates than ‘bridge-shaped’ specimens (with flat and convex surfaces combined). Furthermore, a bridge TP347HFG sample showed the formation of lower amount of flaky oxide at 750°C.