Combination of Electrochemical Noise and Acoustic Emission for Analysis of the Pitting Corrosion Behavior of an Austenitic Stainless Cast Steel

Kietov, Volodymyr; Mandel, Marcel; Krüger, Lutz

doi:10.1002/adem.201800682

Cited by 11 publications

(3 citation statements)

References 46 publications

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“…By comparing the grain size of magnesium-based alloy, it can be seen that the grain size of magnesium-based alloy decreases and the number of grains increases after increasing the cooling rate.After the grain is refined, more grain boundary positions will appear and more corroded galvanic cells will be formed outside the grain boundary. With the increase in the number of galvanic cells, the dissolution rate of soluble magnesium base alloy will gradually increase [12].The dissolution rate of soluble magnesium base alloy increases with the increase of grain refinement.…”

Section: Metallographic Structure Analysis Of Alloymentioning

confidence: 99%

Analysis of Solubility Change of Soluble Magnesium Alloy by Melting Treatment in Petroleum Downhole

Shang

Dong

Wang

2023

J. Phys.: Conf. Ser.

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In order to solve the problem that the material utilization rate of soluble magnesium base alloy rod is less than 30%, the method of magnesium alloy rod casting is adopted to improve the material utilization rate. However, the cooling mode affects the dissolution rate of soluble magnesium alloy after casting. According to the different thermal conductivity of different materials, cylindrical graphite molds and copper molds with diameters of 5mm and 40mm are selected for casting magnesium alloys. In order to ensure the reliability of experimental results, polarization method and weight loss method were used to analyze the dissolution rate of soluble magnesium base alloy under different cooling modes. The test results show that: Magnesium alloy is cooled and solidified by copper mold with a diameter of 5mm, and the dissolution rate is the highest in 1.5% NaCl solution with a speed of 1.2856mm/h. The grain size of magnesium alloy can be refined by increasing cooling rate. After the grain boundary of magnesium-based alloy is refined, the grain boundary between the alloy increases, the number of corrosion galvanic cells increases, and the dissolution rate of magnesium-based alloy gradually increases.

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Section: Metallographic Structure Analysis Of Alloymentioning

confidence: 99%

Analysis of Solubility Change of Soluble Magnesium Alloy by Melting Treatment in Petroleum Downhole

Shang

Dong

Wang

2023

J. Phys.: Conf. Ser.

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“…[11] Nevertheless, a lot of research has been already performed on the corrosion behavior of steels in different corrosive environments and the general effects of alloying elements on the corrosion mechanisms are well examined. [12][13][14][15][16][17] Chemically resistant steels and cast irons can withstand a chemical attack during wet corrosion by forming a thin chromium oxide-based layer on the surface and, thus, significantly impeding the corrosion progress. By increasing the Cr content, a thin porous crystalline film changes into a dense amorphous passive layer.…”

Section: Doi: 101002/adem202200293mentioning

confidence: 99%

Novel Corrosion‐Resistant Tool Steels with Superior Wear Properties

et al. 2022

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Recent toolmaking faces a growing variety of challenges. Innovative solutions in material development and process technology are required. The application of high-strength and wear-resistant materials and composites in industrial production results in constantly increasing demands on the quality of tools and their performance. Furthermore, tools and moulds must withstand permanent use and superimposed loadings. A high strength, an adequate toughness as well as resistance against wear and corrosion of the applied materials are demanded in the processing of e.g., polymers and composites. Here, polymers with very hard fillers like corundum lead to aggressively abrasive wear conditions for the tools. [1,2] Additionally, the tools have to sustain a corrosive attack due to acids (e.g., hydrochloric and sulfuric acid) deriving from polymerisation and thermal degradation of the polymers. [2,3] Thus, corrosion-resistant cold-work steels (e.g., X90CrMoV18 containing 18% Cr) are primarily applied. Alloy designs in order to meet the rising requirements for tools in plastics processing were studied by e.g., Huth et al. [2,4] based on the attempts to produce corrosion-and wearresistant multiphase steels (e.g., X190CrVMo20-4 as well as X140CrNbMo12-10-2) by powder metallurgy (PM). PM steel tools can partly achieve longer service lives than conventionally produced tool steels, because of the enabled addition of a high number of alloying elements like C, Cr, Nb, V to build a lot of very hard (mono)carbides. However, their production is expensive and complex, and their repair and maintenance by e.g., deposition welding is extremely challenging due to the very high carbide content and enclosed production-related gases in the PM steels. [5] A near-net-shape tool production by casting provides an economical alternative to the mentioned timeconsuming and expensive PM manufacturing. Furthermore, by tailored alloy designs as well as targeted solidification and cooling processes, specific microstructures can be adjusted already in the as cast state without any additional forming and heat treatment procedure. Thus, mechanical post-processing can be minimized and subsequent heat treatment is reduced.A targeted alloy design and process optimization for the production of high-strength cast tools are presented in studies of Hufenbach et al. [6][7][8] The tailored casting technology implies high solidification rates ≥ 10 K s À1 by using a copper mould. [9] No additional heat treatment is required to produce castings with

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“…A defect in AE testing is considered not as a discontinuity, but as an active source of elastic waves. In the case of a crack, generation of AE waves may be caused by deformation and fractures as well as by friction between existing defective surfaces, but in the case of corrosion, the most powerful AE signals may be caused by concomitant processes, such as hydrogen bubble formation or corrosion products crumbling [13,14].…”

Section: Introductionmentioning

confidence: 99%

Empirical Approach to Defect Detection Probability by Acoustic Emission Testing

et al. 2021

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Estimation of probability of defect detection (POD) is one of the most important problems in acoustic emission (AE) testing. It is caused by the influence of the material microstructure parameters on the diagnostic data, variability of noises, the ambiguous assessment of the materials emissivity, and other factors, which hamper modeling the AE data, as well as the a priori determination of the diagnostic parameters necessary for calculating POD. In this study, we propose an empirical approach based on the generalization of the experimental AE data acquired under mechanical testing of samples to a priori estimation of the AE signals emitted by the defect. We have studied the samples of common industrial steels 09G2S (similar to steel ANSI A 516-55) and 45 (similar to steel 1045) with fatigue cracks grown in laboratory conditions during cyclic testing. Empirical generalization of data using probabilistic models enables estimating the conditional probability of record emissivity and amplitudes of AE signals. This approach allows to eliminate the existing methodological gap and to build a comprehensive method for assessing the probability of fatigue cracks detection by the AE testing.

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Combination of Electrochemical Noise and Acoustic Emission for Analysis of the Pitting Corrosion Behavior of an Austenitic Stainless Cast Steel

Cited by 11 publications

References 46 publications

Analysis of Solubility Change of Soluble Magnesium Alloy by Melting Treatment in Petroleum Downhole

Analysis of Solubility Change of Soluble Magnesium Alloy by Melting Treatment in Petroleum Downhole

Novel Corrosion‐Resistant Tool Steels with Superior Wear Properties

Empirical Approach to Defect Detection Probability by Acoustic Emission Testing

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