TY  - JOUR
AU  - Rajaković-Ognjanović, Vladana
AU  - Grgur, Branimir N.
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/418
AB  - Dissimilar metal connections are prone to frequent failures. These failures are attributed to the difference in the mechanical properties across the weld, the coefficients of thermal expansion of the two types of steels and the resulting creep at the interface. For the weld analyzed in this research, it was shown that corrosion measurements can be used for a proper evaluation of the quality of weld material and for the prediction of whether or not the material, after the applied welding process, can be in service without failures. It was found that the corrosion of the weld analyzed in this research resulted from the simultaneous activity of different types of corrosion. In this study, electrochemical techniques including polarization and metallographic analysis were used to analyze the corrosion of a weld material of ferrite and austenitic stainless steels. Based on surface, chemical and electrochemical analyses, it was concluded that corrosion occurrence was the result of the simultaneous activity of contact corrosion (ferrite and austenitic material conjuction), stress corrosion (originating from deformed ferrite structure) and inter-granular corrosion (due to chromium carbide precipitation). The value of corrosion potential of -0.53 V shows that this weld, after the thermal treatment, is not able to repassivate a protective oxide film.
AB  - Spojevi različitih metala dobijenih zavarivanjem skloni su propadanju uglavnom usled pojave različitih vidova korozije. Fizičko-hemijska, mehanička svojstva, kao i koeficijenti toplotnog širenja različitih čelika najčešći su uzrok pucanja materijala na zavarenim spojevima. Istraživanja u ovom radu su pokazala da se ispitivanje korozije materijala može koristiti za procenu kvaliteta spojeva zavarenih materijala. Različite analitičke, metalografske i elektrohemijske tehnike i metode analize su primenjene za ispitivanje korozije zavarenog spoja nerđajućih čelika feritne i austenitne strukture. Ustanovljeno je da do pojave korozije na zavarenom spoju ispitivanih materijala prevashodno dolazi usled: kontaktne korozije, naponske korozije (koja potiče od deformisane strukture ferita) i međukristalne korozije (posledica izluživanja hrom-karbida) u feritnom delu zavarenog spoja.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Corrosion of an austenite and ferrite stainless steel weld
T1  - Korozija zavarenog spoja austenitnog i feritnog nerđajućeg čelika
EP  - 1035
IS  - 7
SP  - 1027
VL  - 76
DO  - 10.2298/JSC100726090R
ER  - 

@article{
author = "Rajaković-Ognjanović, Vladana and Grgur, Branimir N.",
year = "2011",
abstract = "Dissimilar metal connections are prone to frequent failures. These failures are attributed to the difference in the mechanical properties across the weld, the coefficients of thermal expansion of the two types of steels and the resulting creep at the interface. For the weld analyzed in this research, it was shown that corrosion measurements can be used for a proper evaluation of the quality of weld material and for the prediction of whether or not the material, after the applied welding process, can be in service without failures. It was found that the corrosion of the weld analyzed in this research resulted from the simultaneous activity of different types of corrosion. In this study, electrochemical techniques including polarization and metallographic analysis were used to analyze the corrosion of a weld material of ferrite and austenitic stainless steels. Based on surface, chemical and electrochemical analyses, it was concluded that corrosion occurrence was the result of the simultaneous activity of contact corrosion (ferrite and austenitic material conjuction), stress corrosion (originating from deformed ferrite structure) and inter-granular corrosion (due to chromium carbide precipitation). The value of corrosion potential of -0.53 V shows that this weld, after the thermal treatment, is not able to repassivate a protective oxide film., Spojevi različitih metala dobijenih zavarivanjem skloni su propadanju uglavnom usled pojave različitih vidova korozije. Fizičko-hemijska, mehanička svojstva, kao i koeficijenti toplotnog širenja različitih čelika najčešći su uzrok pucanja materijala na zavarenim spojevima. Istraživanja u ovom radu su pokazala da se ispitivanje korozije materijala može koristiti za procenu kvaliteta spojeva zavarenih materijala. Različite analitičke, metalografske i elektrohemijske tehnike i metode analize su primenjene za ispitivanje korozije zavarenog spoja nerđajućih čelika feritne i austenitne strukture. Ustanovljeno je da do pojave korozije na zavarenom spoju ispitivanih materijala prevashodno dolazi usled: kontaktne korozije, naponske korozije (koja potiče od deformisane strukture ferita) i međukristalne korozije (posledica izluživanja hrom-karbida) u feritnom delu zavarenog spoja.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Corrosion of an austenite and ferrite stainless steel weld, Korozija zavarenog spoja austenitnog i feritnog nerđajućeg čelika",
pages = "1035-1027",
number = "7",
volume = "76",
doi = "10.2298/JSC100726090R"
}

Rajaković-Ognjanović, V.,& Grgur, B. N.. (2011). Corrosion of an austenite and ferrite stainless steel weld. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 76(7), 1027-1035.
https://doi.org/10.2298/JSC100726090R

Rajaković-Ognjanović V, Grgur BN. Corrosion of an austenite and ferrite stainless steel weld. in Journal of the Serbian Chemical Society. 2011;76(7):1027-1035.
doi:10.2298/JSC100726090R .

Rajaković-Ognjanović, Vladana, Grgur, Branimir N., "Corrosion of an austenite and ferrite stainless steel weld" in Journal of the Serbian Chemical Society, 76, no. 7 (2011):1027-1035,
https://doi.org/10.2298/JSC100726090R . .

TY  - JOUR
AU  - Rajaković-Ognjanović, Vladana
AU  - Živojinović, Dragana Z.
AU  - Grgur, Branimir N.
AU  - Rajaković, Ljubinka V.
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/410
AB  - A more effective chemical control in the water-steam cycle (WSC) of thermal power plants (TPP) is proposed in this paper. Minimization of corrosion effects by the production of ultra pure water and its strict control is the basis of all the investigated processes. The research involved the analysis of water samples in the WSC through key water quality parameters and by the most convenient analytical tools. The necessity for the stricter chemical control is demonstrated through a concrete example of the TPP Nikola Tesla, Serbia. After a thorough analysis of the chemical control system of the WSC, diagnostic and control parameters were chosen for continuous systematic measurements. Sodium and chloride ions were recognized as the ions which indicate the corrosion potential of the water and give insight into the proper production and maintenance of water within the WSC. Chemical transformations of crucial corrosion elements, iron and silica, were considered and related to their quantitative values.
T2  - Applied Thermal Engineering
T1  - Improvement of chemical control in the water-steam cycle of thermal power plants
EP  - 128
IS  - 1
SP  - 119
VL  - 31
DO  - 10.1016/j.applthermaleng.2010.08.028
ER  - 

@article{
author = "Rajaković-Ognjanović, Vladana and Živojinović, Dragana Z. and Grgur, Branimir N. and Rajaković, Ljubinka V.",
year = "2011",
abstract = "A more effective chemical control in the water-steam cycle (WSC) of thermal power plants (TPP) is proposed in this paper. Minimization of corrosion effects by the production of ultra pure water and its strict control is the basis of all the investigated processes. The research involved the analysis of water samples in the WSC through key water quality parameters and by the most convenient analytical tools. The necessity for the stricter chemical control is demonstrated through a concrete example of the TPP Nikola Tesla, Serbia. After a thorough analysis of the chemical control system of the WSC, diagnostic and control parameters were chosen for continuous systematic measurements. Sodium and chloride ions were recognized as the ions which indicate the corrosion potential of the water and give insight into the proper production and maintenance of water within the WSC. Chemical transformations of crucial corrosion elements, iron and silica, were considered and related to their quantitative values.",
journal = "Applied Thermal Engineering",
title = "Improvement of chemical control in the water-steam cycle of thermal power plants",
pages = "128-119",
number = "1",
volume = "31",
doi = "10.1016/j.applthermaleng.2010.08.028"
}

Rajaković-Ognjanović, V., Živojinović, D. Z., Grgur, B. N.,& Rajaković, L. V.. (2011). Improvement of chemical control in the water-steam cycle of thermal power plants. in Applied Thermal Engineering, 31(1), 119-128.
https://doi.org/10.1016/j.applthermaleng.2010.08.028

Rajaković-Ognjanović V, Živojinović DZ, Grgur BN, Rajaković LV. Improvement of chemical control in the water-steam cycle of thermal power plants. in Applied Thermal Engineering. 2011;31(1):119-128.
doi:10.1016/j.applthermaleng.2010.08.028 .

Rajaković-Ognjanović, Vladana, Živojinović, Dragana Z., Grgur, Branimir N., Rajaković, Ljubinka V., "Improvement of chemical control in the water-steam cycle of thermal power plants" in Applied Thermal Engineering, 31, no. 1 (2011):119-128,
https://doi.org/10.1016/j.applthermaleng.2010.08.028 . .