Influence of Local Temperature Changes on the Material Microstructure in Abrasive Water Jet Machining (AWJM)

Spadło, S.; Bańkowski, Damian; Młynarczyk, P.; Hlaváčová, Irena M.

doi:10.3390/ma14185399

Cited by 10 publications

(7 citation statements)

References 20 publications

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“…However, as described in [ 17 ], the authors indicate that the temperature in the jet impact zone may be higher than 0.4 times the melting temperature in the absolute temperature scale (K), which gives us approximately 450 °C. It should be noted that abrasive water jet machining requires high-density energy to make the particles erode so that the material can be split.…”

Section: Resultsmentioning

confidence: 99%

“…The research described in [ 16 ] shows that the temperatures of aluminium and steel cut by AWJM are not higher than 65 °C and 70 °C, respectively. However, from the investigations presented in [ 17 ], it is clear that in the AWJ cutting of steel, the temperature may exceed 450 °C.…”

Section: Introductionmentioning

confidence: 99%

“…Although the AWJM process is commonly referred to as one involving little or no heat transfer with no or negligible effect on the material structure [ 7 ], the latest studies [ 17 ] show that during the AWJM process, very high temperatures are reached, and these contribute to changes in the workpiece microstructure along the edge.…”

Section: Introductionmentioning

confidence: 99%

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Temperature Measurement during Abrasive Water Jet Machining (AWJM)

2022

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This study was undertaken to look for confirmation that heat transfer induced by abrasive water jet machining (AWJM) affects the microstructure of the material cut. The structure of S235JR carbon steel used in the experiments was reported to change locally in the jet impact zone due to the high concentration of energy generated during cutting with the abrasive water jet. It is assumed that some of the energy is transferred into the material in the form of heat. This is particularly true for materials of considerable thickness with a high thermal conductivity coefficient when cutting is performed at low speeds or with high abrasive consumption. The literature on the subject suggests that in AWJM there is little or no thermal energy effect on the microstructure of the material cut. The research described here involved the measurement of the cutting temperature with thermocouples placed at four different distances from the edge. The distances were measured using computed tomography inspection. The thermocouples used in the tests were capable of detecting temperatures of up to 100 °C. Locally, temperatures at the edge may reach much higher values. The results of the X-ray diffraction qualitative phase analysis reveal that locally the temperatures may be much higher than the eutectoid temperature. Phase changes occurred along the edge since austenite was observed. This suggests that the temperature in the jet impact zone was much higher than the eutectoid temperature. Optical microscopy was also employed to study the material microstructure. Finally, the material nanohardness was determined.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature Measurement during Abrasive Water Jet Machining (AWJM)

2022

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“…It is most often composed of calcite-CaCO 3 or dolomite-CaMg(CO 3 ) 2 , by recrystallization. The main properties of marble are: porosity (%), density (g/cm 3 ), compressive strength (MPa), flexural strength (MPa), Amsler abrasion wear (mm/1000 m), hardness (Mohs), Young's modulus (GPa), fracture toughness (MPa/m) [2,14] and largely depend on the area from which it comes.…”

Section: The Process Of Creating and Propagating Microcracks In Marblementioning

confidence: 99%

“…Equipment manufacturers invest heavily in research into this successful technology, keeping it at the forefront of unconventional technologies. The results of recent research are seen in the increase of the performances in the working speed, the increase of the quality, versatility and the decrease of the price of the products [1][2][3]. The possibilities of machines configuration are greater and use has become easier.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Cracks in Marble Appeared at Hydro-Abrasive Jet Cutting Using Taguchi Method

Barabas¹,

Florescu²

2022

Materials

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The appearance of cracks in brittle materials in general and in marble, in particular, is a problem in the hydro-abrasive jet cutting process. In this paper is presented a method to reduce the appearance of cracks when cutting with a hydro-abrasive jet of marble by using statistical analysis. The Taguchi method was used, establishing the main parameters that influence the process. Research design was based on performing experiments by modifying the parameters that influence the process. In this way, it has been shown that the stochastic effects resulting from the marble structure can be reduced. A careful study was made of the behavior of marble under the action of the hydro-abrasive jet, and of the behavior of the whole process in the processing of brittle materials. Results of experiments confirmed the hypothesis that statistical analysis is a procedure that can lead to a decrease in the number of cracks in processing. The measurement was performed with precise instruments and analyzed with recognized software and according to the results obtained, the reduction of the number of cracks is achieved through use of low pressure, a minimum stand-off distance and a small tube diameter. In this way, the paper presents a new and effective tool for optimizing the cutting with a hydro-abrasive jet of marble.

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Implications of stress concentrators and work hardening in flat tensile samples subjected to milling and abrasive water jet machining

Buglioni,

Krahmer,

Sánchez Egea

et al. 2024

Int J Adv Manuf Technol

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The milling process is the standard method for producing flat tensile test specimens from sheet metal. However, alternative methods employed in the industry for cutting sheet metal include abrasive water jet cutting, laser cutting, punching, and, to a lesser extent, electrical discharge machining. Among these, abrasive water jet cutting stands out for its superior material integrity, versatility, precision, and efficiency, making it a preferred choice. Previous studies consistently show that specimens cut by abrasive water jetting exhibit lower ultimate tensile strength and higher percent elongation than those obtained by milling in standardized tensile tests. This study investigates this behavior across different types of steel and alloys. Both steel types were subjected to milling and water jetting processes, followed by an analysis of their experimental and simulated mechanical behavior to identify discrepancies between the two methods. The findings suggest that milling, influenced by factors such as feed per tooth and cutter diameter, introduces geometric stress concentrators. This relative increase in ultimate tensile strength and decrease in percent elongation are observed consistently in milled tensile specimens compared to those cut by water jet, regardless of material type or thickness. Additionally, the effects of perimeter hardening resulting from superficial plastic deformation caused by the cutting edge, likely due to its small thickness, do not influence the observed trends significantly.

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Influence of Local Temperature Changes on the Material Microstructure in Abrasive Water Jet Machining (AWJM)

Cited by 10 publications

References 20 publications

Temperature Measurement during Abrasive Water Jet Machining (AWJM)

Temperature Measurement during Abrasive Water Jet Machining (AWJM)

Reduction of Cracks in Marble Appeared at Hydro-Abrasive Jet Cutting Using Taguchi Method

Implications of stress concentrators and work hardening in flat tensile samples subjected to milling and abrasive water jet machining

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