51. Effect of surface machining on the environmentally-assisted cracking of Alloy 182 and 316L stainless steel in light water reactor environments : results of the collaborative project MEACTOSMariia Zimina, Stefan Ritter, Bojan Zajec, Marc Vankeerberghen, Liberato Volpe, Anna Hojna, Rik-Wouter Bosch, Fabio Scenini, Zaiqing Que, Alberto Sáez-Maderuelo, P. Jill Meadows, Michael Grimm, Matthias Herbst, Andraž Legat, Agostino Maurotto, Radek Novotny, Karl-Heinz Seifert, 2023, izvirni znanstveni članek Povzetek: The main objective of the EU-funded project mitigating environmentally-assisted cracking through optimisation of surface condition (MEACTOS) was to gain knowledge on the ability of different surface machining procedures to mitigate environmentally-assisted cracking (EAC) in typical light water reactor structural materials and environments. Surfaces of cold-worked (CW) type 316L austenitic stainless steel and nickel-based weld metal Alloy 182 flat tapered tensile specimens were machined using different processes. EAC initiation susceptibility of these specimens was evaluated using constant extension rate tensile (CERT) tests under simulated boiling water reactor (BWR) and pressurized water reactor (PWR) conditions and assessed using constant load experiments. More than a hundred tests were performed covering about 10 years of autoclave testing time. Only minor or no measurable improvements in EAC initiation susceptibility as a function of surface treatments (grinding or advanced machining) compared to the standard industrial face milling were demonstrated. In most cases, the stress thresholds for EAC initiation determined in constant load tests confirmed the trend obtained from CERT tests. This paper summarises the most important results and conclusions concerning the EAC initiation behaviour for the CW 316L and Alloy 182 under reducing PWR and oxidizing BWR conditions.
Ključne besede: crack initiation, environmentally-assisted cracking, Alloy 182, AISI 304 stainless steel, surface treatment, light water reactor, open access
Objavljeno v DiRROS: 30.05.2023; Ogledov: 370; Prenosov: 204
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52. Characterization of steel corrosion processes in various blended cements by means of coupled multi-electrode arraysMiha Hren, Tadeja Kosec, Andraž Legat, 2023, izvirni znanstveni članek Povzetek: Supplementary cementitious materials can affect the porosity of concrete, pore solution pH and chloride binding, all of which influence the type and magnitude of corrosion damage. Advanced corrosion monitoring techniques are needed to follow the development of corrosion on steel embedded in concrete across space and over time. In this study, coupled multi-electrode arrays (CMEAs) were used to characterise corrosion processes in OPC and three blended cements. Cyclic wetting with chlorides was undertaken to initiate corrosion. The results showed three distinct types of corrosion: localised corrosion (CEM I), localised corrosion that expanded over time (CEM II), and a combination of localised and general corrosion (CEM III and CEM IV). Cathodic locations were also monitored successfully, and the corrosion behaviour was related to total porosity and pH of the pore solution. MicroCT was used to quantify the volume of corroded material, which agreed well with results calculated from the CMEA measurements.
Ključne besede: blended cements, coupled multi-electrode array, corrosion of steel in concrete, supplementary cementitious materials, open access
Objavljeno v DiRROS: 29.05.2023; Ogledov: 313; Prenosov: 183
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53. Influence of the deep cryogenic treatment on AISI 52100 and AISI D3 steelʼs corrosion resistancePatricia Jovičević Klug, Tjaša Kranjec, Matic Klug Jovičević, Tadeja Kosec, Bojan Podgornik, 2021, izvirni znanstveni članek Povzetek: The effect of deep cryogenic treatment (DCT) on corrosion resistance of steels AISI 52100 and AISI D3 is investigated and compared with conventional heat-treated counterparts. DCTʼs influence on microstructural changes is subsequently correlated to the corrosion resistance. DCT is confirmed to reduce the formation of corrosion products on steelsʼ surface, retard the corrosion products development and propagation. DCT reduces surface cracking, which is considered to be related to modified residual stress state of the material. DCTʼs influence on each steel results from the altered microstructure and alloying element concentration that depends on steel matrix and type. This study presents DCT as an effective method for corrosion resistance alteration of steels.
Ključne besede: steel, deep cryogenic treatment, corrosion, Raman, open access
Objavljeno v DiRROS: 19.05.2023; Ogledov: 327; Prenosov: 235
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54. Leaching and geochemical modelling of an electric arc furnace (EAF) and ladle slag heapMojca Loncnar, Ana Mladenovič, Vesna Zalar Serjun, Marija Zupančič, Hans A. van der Sloot, 2022, izvirni znanstveni članek Povzetek: Old metallurgical dumps across Europe represent a loss of valuable land and a potential threat to the environment, especially to groundwater (GW). The Javornik electric arc furnace (EAF) and ladle slag heap, situated in Slovenia, was investigated in this study. The environmental impact of the slag heap was evaluated by combining leaching characterization tests of landfill samples and geochemical modelling. It was shown that throughout the landfill the same minerals and sorptive phases control the leaching of elements of potential concern, despite variations in chemical composi- tion. Although carbonation of the disposed steel slags occurred (molar ratio CO3/(Ca+Mg) = 0.53) relative to fresh slag, it had a limited effect on the leaching behaviour of elements of potential concern. The leaching from the slag heaps had also a limited effect on the quality of the GW. A site-specific case, however, was that leachates from the slag heap were strongly diluted, since a rapid flow of GW fed from the nearby Sava River was observed in the landfill area. The sampling and testing approach applied provides a basis for assessing the long-term impact of release and is a good starting point for evaluating future management options, including beneficial uses for this type of slag.
Ključne besede: EAF slag, field verification, geochemical modelling, ladle slag, leaching, release prediction, steel slag heap
Objavljeno v DiRROS: 28.04.2023; Ogledov: 397; Prenosov: 209
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56. Current trends on mechanical, corrosion resistance, and antibacterial properties of metallic materials : editorialMarjetka Conradi, Aleksandra Kocijan, 2022, predgovor, uvodnik, spremna beseda Ključne besede: steel, corrosion resistance, mechanical properties, antibacterial properties
Objavljeno v DiRROS: 22.06.2022; Ogledov: 529; Prenosov: 142
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57. Residual stress modeling and analysis in AISI A2 steel processed by an electrical discharge machineDinesh Kumar, Krishan Kant Singh Mer, Hoshiyar Singh Payal, Kapil Kumar, 2022, izvirni znanstveni članek Ključne besede: electro discharge machining, numerical simulation, residual stress, dielectric fluid, AISI A2 die steel, Gaussian distributed heat flux
Objavljeno v DiRROS: 22.06.2022; Ogledov: 574; Prenosov: 141
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58. High-temperature deformation behavior andhot-processing map of 25CrMo4 axle steel based onfriction correctionKeran Liu, Yuanming Huo, Tao He, Cunlong Huo, Changyuan Jia, Xiangyang Du, Baoyu Wang, 2021, izvirni znanstveni članek Ključne besede: 25CrMo4 axle steel, hot-compression test, hot processing map, friction correction
Objavljeno v DiRROS: 06.05.2022; Ogledov: 509; Prenosov: 127
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59. Classification of hot-rolled plates using the Mahalanobis distance of NMIs in Ti-stabilized austenitic stainless-steel produced by secondary metallurgyFranci Vode, Franc Tehovnik, Gorazd Kosec, Darja Steiner Petrovič, 2022, izvirni znanstveni članek Ključne besede: stainless steel, ferrotitanium, impurities, oxygen, nonmetallic inclusions, scrap recycling, automated inclusion analysis, Mahalanobis distance
Objavljeno v DiRROS: 06.05.2022; Ogledov: 531; Prenosov: 165
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