Researches upon the cavitation erosion behaviour of austenite steels

Bordeaşu, Ilare; Popoviciu, M O; Mitelea, Ion; Salcianu, L C; Bordeasu, Dorin; Duma, S. T.; Iosif, Anton

doi:10.1088/1757-899x/106/1/012001

Cited by 6 publications

(11 citation statements)

References 3 publications

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“…The experiments regarding the resistance to cavitation of the experimental samples were carried out in the Cavitation Erosion Research Laboratory [18] of the Politehnica University of Timis , oara, on a vibrating device with piezoceramic crystals, using the indirect method of testing (with a stationary sample), cylindrical samples with a diameter of 15.8 mm and a length of 16 mm [8,20,30,33]. The distance between the sonotrode vortex and the sample surface, subject to cavitation erosion, in these tests was 1.5 mm, which is laboratory courtesy, as other authors have tested at 0.5 mm [39] and others at 1.0 mm [40].…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…The results regarding the cavitation erosion behavior are expressed in three ways: as graphs (Figure 10), which show the variation with the duration of the cavitation attack of the cumulative mean depth of erosion (MDE) and the mean erosion penetration rate (MDER), as required by the international standard ASTM G32-2016 [8,9,[19][20][21]30,33,39]; through images obtained from the optical/stereomicroscopic analysis (Figures 11-13); or through scanning electron microscope images, Figures 14 and 15. Both MDE and MDER are calculated based on the mass losses obtained in the intermediate periods of the total test duration (one each of 5 and 10 min and 10 of 15 min each), knowing that the surface diameter of the samples is 15.8 mm.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

“…One of the most adaptable metals, aluminum is used in a variety of compounds that are continuously being researched. Due to their combination of simultaneous characteristics-low density, high specific strength, and excellent corrosion resistance-alloys in the 5xxx series are used in the shipbuilding, automotive, aerospace, and transportation industries as well as in the production of some hydraulic system components [1][2][3][4][5][6][7][8][9]. There are well known characteristics of the 5083 aluminum alloy, either after post-solution cooling or after welding [4].…”

Section: Introductionmentioning

confidence: 99%

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Correlation between Mechanical Properties—Structural Characteristics and Cavitation Resistance of Rolled Aluminum Alloy Type 5083

Istrate,

Bordeasu,

Ghiban

et al. 2023

Metals

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The 5000 series aluminum alloy 5083 is distinguished by excellent processability, excellent welding characteristics, and a strong resilience to corrosion, particularly in maritime environments. It is employed in the manufacture of ships, automobiles, spacecraft, and industrial buildings. The goal of the current study is to determine whether there is any relationship between the mechanical properties, structural characteristics, and cavitation erosion properties of aluminum alloy 5083 in the H111 state (rolled from 454 °C to 399 °C and annealed at 343 °C by holding in cooled air), followed by artificial ageing at (180 °C) with three maintenance periods of 1 h, 12 h, and 24 h, and at (140 °C) with three maintenance periods of 1 h, 12 h, and 24 h. The cavitation resistance experiments of the experimental samples were performed in accordance with ASTM G32-2016. The resistance to cavitation erosion was determined by making mean erosion penetration rate (MDER) or mean depth of erosion (MDE) analytical diagrams according to the duration of the cavitation attack and by measuring the maximum depth of cavitation erosion in the samples analyzed by stereomicroscopy and scanning electron microscopy. Finally, a structural correlation between the condition of the artificially aged laminate alloy and its resistance to cavitation erosion could be achieved: ageing at 180 °C, maintained for 24 h, could lead to a maximum depth of cavitation erosion MDEmax of about 5 µm.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correlation between Mechanical Properties—Structural Characteristics and Cavitation Resistance of Rolled Aluminum Alloy Type 5083

Istrate,

Bordeasu,

Ghiban

et al. 2023

Metals

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“…This expansion is possible due to new technologies and mechanical processing equipment according to complex spatial contours, based on numerical control and computer control [8]. Another reason, which underlies the extension of the application of aluminum alloys to parts working in cavitation currents, is the use of volumetric heat treatments, through which the modification of mechanical properties is done with a reset of the microstructure, without major changes [9][10][11][12], as is the case with steels (for example) [11][12][13][14][15]. For these reasons, the latest research, carried out on pure aluminum [16,17], and extended to various aluminum-based alloys to understand the mechanism of behavior and degradation of the structure at the hydrodynamic stresses of cavitation micro-jets [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Cavitation behavior study of the aging heat treated aluminum alloy 7075

Luca

Bordeaşu

Ghiban

et al. 2023

J. Phys.: Conf. Ser.

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Aluminium-based alloy type 7075 is known for its good ductility, high mechanical strength, toughness and high fatigue strength, which is why it is mainly used in the construction of dynamically stressed parts in the structure of airplanes, vehicles and ships. Although it has these qualities, at present its behavior has not been studied at the hydrodynamic stresses that allow it to be used in parts that work in cavitation conditions, such as pump rotors and boat propeller blades. Therefore, the research in this paper highlights the behavior of laminated semi-finished structures and obtained by heat treatment of artificial aging at 180°C, with a maintenance time of one hour. Of the 7075 alloy at the demands generated by the vibrating cavity, created by the standard vibrating device with piezoceramic crystals (frequency of 20 kHz, amplitude of 50 µm and electrical power of 500 W). Analysis based on the curves MDE (t) and MDER (t), of the specific parameters of cavitation erosion MDEmax and MDERs as well as of the macro and microscopic images of the eroded structures of cavitation show that, compared to the delivered state (semi-finished), by the heat treatment applied the microstructure does not change cavitation

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“…As this type of part, at certain operating regimes, is eroded by cavitation, it is required to continue the research on aluminum alloys in order to identify technologies that can increase the resistance of the structures exposed to the cyclic and destructive stresses created by the microjets of the cavitation. of the cavitation [9][10][11][12][13][14][15][16]. The most widely used technology for increasing the resistance of the structure of a part exposed to cavitation is the volume heat treatment [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of aging heat treatment at 180 °C on cavitation erosion for aluminum alloy type 5083 in cold rolled state

Micu,

Bordeasu,

Dionisie

et al. 2023

J. Phys.: Conf. Ser.

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Aluminum-based alloys have wide applicability in the construction of aircraft, vehicles, and ships. Some of their components, during operation, such as the radiators and the rotors of the cooling pumps in the vehicles, and the propellers of fishing and pleasure boats are affected by the abrasive, chemical and cavitational corrosive action of the water. At certain hydrodynamic flow regimes, the most dangerous becomes the corrosion through cavitation. Operation in such regimes inevitably leads to damaging the structure, due to cyclic stresses of the micro-jets and shock waves generated by the implosion of cavitation bubbles. Although the chemical constitution and alloying with other chemical elements increase the mechanical properties, the service life is still limited when operating in high-intensity cavitation flows. Therefore, researchers are looking for solutions to improve this resistance through various treatments, such as bulk heat. Research heading the same direction, but, made on 5083 alloy, is presented in this paper. The results highlight the behavior of a modified structure compared to the semi-fabricated state (obtained by rolling), through three durations regimes (one hours, 12 hours and 24 hours) of aging heat treatment to 180 °C temperature, after hardening treatment at 450 °C. The cavitation tests were performed in the Laboratory of the Polytechnic University of Timisoara, on the standard vibrating device with piezoceramic crystals. The results were expressed by curves and parameters specific to the evaluation of cavitation resistance, and by macro and microscopic images, showing the unique aspects of the connection between the structure and the mechanical properties obtained through heat treatment regimes. Thus, comparison of the results, including with the delivery state (laminated product), shows that the highest resistance is provided by the treatment at 24 hours. At the same time, the erosion, of pitting and caverns type, and differs from one structure to another.

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Researches upon the cavitation erosion behaviour of austenite steels

Cited by 6 publications

References 3 publications

Correlation between Mechanical Properties—Structural Characteristics and Cavitation Resistance of Rolled Aluminum Alloy Type 5083

Correlation between Mechanical Properties—Structural Characteristics and Cavitation Resistance of Rolled Aluminum Alloy Type 5083

Cavitation behavior study of the aging heat treated aluminum alloy 7075

Influence of aging heat treatment at 180 °C on cavitation erosion for aluminum alloy type 5083 in cold rolled state

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