Surface Treatment of AISI 304 Using Pulsating Water Jet Peening

Srivastava, Madhulika; Tripathi, Rajesh; Hloch, Sergej; Rajput, Ayush; Khublani, Drupad; Chattopadhyaya, Somnath; Dixit, Amit Rai; Foldyna, Josef; Adamčík, Pavel; Klich, Jiří; Zeleňák, Michal; Klichová, Dagmar

doi:10.1007/978-981-10-5329-0_40

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…By periodically applying impact pressure in the form of a water droplet, which has higher pressure values than stagnation pressure [7], in a continuous stream, it is possible to erode the material at lower operating pressures of 10-100 MPa [8]. The advantages of pulsating water jets (PWJs) can be grouped into three main areas: first, they are more efficient compared with continuous water jets under the same hydraulic conditions [9]; second, the pressure acts upon the impacted area in a periodic manner, which can be used Materials 2021, 14, 5212 2 of 20 for surface reinforcement, such as the peening method [10,11]; and third, A PWJ acting without added solid (abrasive) particles can be used in the treatment of structural parts for medical applications [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Surface and Subsurface Analysis of Stainless Steel and Titanium Alloys Exposed to Ultrasonic Pulsating Water Jet

et al. 2021

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This article deals with the effect of periodically acting liquid droplets on the polished surfaces of AISI 316L stainless steel and Ti6Al4V titanium alloy. These materials were exposed to a pulsating water jet produced using an ultrasonic sonotrode with an oscillation frequency of 21 kHz placed in a pressure chamber. The only variable in the experiments was the time for which the materials were exposed to water droplets, i.e., the number of impingements; the other parameters were kept constant. We chose a low number of impingements to study the incubation stages of the deformation caused by the pulsating water jet. The surfaces of the specimens were studied using (1) confocal microscopy for characterizing the surface profile induced by the water jet, (2) scanning electron microscopy for detailed surface observation, and (3) transmission electron microscopy for detecting the changes in the near-surface microstructure. The surface described by the height of the primary profile of the surface increased with the number of impingements, and was substantially more intense in the austenitic steel than in the Ti alloy. Irregular surface depressions, slip lines, and short cracks were observed in the Ti alloy, whereas pronounced straight slip bands formed in the austenitic steel. The dislocation density near the surface was measured quantitatively, reaching high values of the order of 1014 m−2 in the austenitic steel and even higher values (up to 3 × 1015 m−2) in the Ti alloy. The origins of the mentioned surface features differed in the two materials: an intense dislocation slip on parallel slip planes for the Ti alloy and mechanical twinning combined with dislocation slip for the austenitic steel.

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Section: Introductionmentioning

confidence: 99%

Surface and Subsurface Analysis of Stainless Steel and Titanium Alloys Exposed to Ultrasonic Pulsating Water Jet

et al. 2021

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“…The presence of such stresses eventually decreases the life of the component and its tensile load capacity under dynamic loading. A number of post-treatment methods (grinding, heat treatment, rolling, shot peening [2], laser shock peening [3], water jet peening [4], ultrasonic peening [1]) are employed to reduce the detrimental effects of these stresses and improve the surface properties of the materials. The aforementioned techniques are efficient for inducing compressive residual stresses, refining the grains in the near-surface layers and thereby causing the work hardening effect in the treated area.…”

Section: Introductionmentioning

confidence: 99%

Utilizing the water hammer effect to enhance the mechanical properties of AISI 304 welded joints

Srivastava

Hloch

Krejčí

et al. 2021

Int J Adv Manuf Technol

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The local residual stresses (tensile) generated on the surface of a component during its manufacturing (machining, welding) cause deterioration of its service life. To eliminate the negative effect of the stresses, the surface is treated using different methods (shot peening, laser shock peening, heat treatment, water jet peening). The application of ultrasonic technology to modify the continuous jet has been intensively researched for treating advanced stages of erosion. In this work, the modifications in the mechanical properties (tensile strength, micro-hardness and residual stress measurements) of AISI 304 Tungsten inert gas welded joints were investigated after ultrasonic pulsating water jet treatment in the incubation stage of erosion. This revealed that the initial tensile residual stress in the welded joints was converted to compressive stress after the treatment. The micro-hardness of the joints after the treatment increased about 40% in the heat affected zone in the near-surface region. Also, the tensile properties increased by about 37.8% and 34.6% in yield strength and ultimate strength, respectively. The microstructural examination of the near-surface region showed the grain reformation mechanism.

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