Surface Plastic Deformation and Nanocrystallization Mechanism of Welded Joint of 16MnR Steel Treated by Ultrasonic Impact

Yu, Yang; He, Bin; Liu, Jing; Chen, Zhaoxia; Man, Hua

doi:10.5755/j01.ms.21.4.9563

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…At the initial stage of ultrasonic peening treatment, the plastic deformation in the material first occurs in some grains whose orientation is easy to slip, but due to the obstruction of grain boundaries, the plastic deformation of grains in the same layer is uneven, and the plastic deformation gradually extends from the surface layer of the material to the deep layer of the material, so the microstructure presents a gradient distribution along the thickness direction [3]. After ultrasonic peening treatment, the geometric shape of the welding toe has changed, and the discontinuity of the geometric shape of the welding toe has changed into a smooth transition, and the original micro-bumps, grooves, and other surfaces have disappeared, as shown in Figures 2 and 3.…”

Section: Macro-morphology Of Welding Toementioning

confidence: 99%

Surface Quality and Microstructure of Welded Joint of 12Cr1MoV Steel by Ultrasonic Peening

Zhou,

Hou,

Liu

et al. 2023

J. Phys.: Conf. Ser.

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The Ferrite heat-resistant steel 12Cr1MoV is extensively used for structural applications in thermal power plants due to its good strength, weldability and long-term stability. The components often undergo fatigue loading, which leads to premature failure. In most cases, fatigue cracks usually initiate from the surfaces of structural components. Hence, surface strengthening treatment is a necessary procedure to improve fatigue performance. In general, ultrasonic peening is treated as an important means of improving fatigue properties. In this study, the effect of ultrasonic peening on the microstructure evolution of 12Cr1MoV steel in service was investigated. Work hardened layer and plastic deformation layer with nanocrystals were generated in the 12Cr1MoV surface after ultrasonic peening treatment. The nanocrystallization process of grains was deeply discussed. The variation of fatigue notch coefficient under different ultrasonic peening parameters was analyzed in detail. The results show that ultrasonic peening can optimize the geometry of the weld toe and reduce the fatigue notch coefficient. In addition, after the UIT1 parameter treatment, the depth of ultrasonic peening on the base material can reach about 220 um, and after the UIT2 parameter treatment, the depth of impact on the base material can reach about 250 um. Compared with the original sample, the hardness of UIT1 increases by 20% and UIT2 increases by 26% at the depth of 0.1mm. Grains are refined to about 200 nm in the topmost surface after ultrasonic peening treatment. The mechanism of nanocrystallization is mainly due to dislocation motion.

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Section: Macro-morphology Of Welding Toementioning

confidence: 99%

Surface Quality and Microstructure of Welded Joint of 12Cr1MoV Steel by Ultrasonic Peening

Zhou,

Hou,

Liu

et al. 2023

J. Phys.: Conf. Ser.

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“…UIT processing is very similar to traditional ultrasonic shot peening but instead of using impact balls, it uses a hemispherical impact needle(s) applied directly to the target materials at a high frequency of more than 20 kHz, so that the substrate is subjected to severe plastic deformation on its surface. Under the repeated high-frequency, high-energy impact of the impact needle(s), sustainably formed severe regional plastic deformation, surface microstructure evolution, and residual compressive stress are introduced in the treated region of the substrate [29,30]. In this case, the desired residual compression stress and deformation can be achieved through adjusting the impact parameters [31].…”

Section: Introductionmentioning

confidence: 99%

“…Up until now, owing to its efficiency, low cost, and minimum geometrical restriction, UIT has been shown to be a very promising technique to use for surface enhancement, and the effects of this on the wear properties of the stainless steel coating have been extensively studied globally. Research on the increased wear resistance of 16MnR steel [30], Ti-6Al-4V alloy [32], 316L stainless steel [24], AZ31B magnesium alloy micro-arc oxidation composite coating [33], and Al0.5CoCrFeMnNi high-entropy alloy coatings [34] induced with UIT has been reported, and many of these studies found that the improvements in wear resistance can be attributed to the following two reasons: the modification of surface topography and the synergistic effects of grain refinement and hardness enhancement. It is more effective to design a coating with a gradient structure in order to achieve excellent tribological properties [11].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Wear Behavior of a Stainless Steel Coating Deposited on a Medium-Carbon Low-Alloy Steel Using Ultrasonic Impact Treatment

Li,

Guo,

Jia

et al. 2023

Coatings

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This study aims to explore the effects of ultrasonic impact parameters on the surface modification of a stainless steel coating deposited on a medium-carbon low-alloy steel using argon arc surfacing welding. Ultrasonic impact treatment (UIT), at three different vibration strike numbers (40,000 times/(mm2), 57,600 times/(mm2), and 75,000 times/(mm2)) marked UIT–1, UIT–2, and UIT–3, respectively, was carried out to modify the surface structure and properties of the stainless steel coating. The surface morphological and structural features, phase compositions, grain size, topography, micro-mechanical properties, as well as the wear resistance of the coating before and after UIT with different impact parameters were experimentally investigated. The results of optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD) analyses revealed that the grain refinement accompanied by the formation of the strain-induced α′–martensite occurred on the UIT-treated coating surface. With the increase in the vibration strike number, the surface grain size and roughness decreased, while the α′–martensite content increased. Micro-hardness after UIT was increased by about 19% (UIT–1), 39% (UIT–2), and 57% (UIT–3), and the corresponding wear rate obtained was decreased by 39%, 72%, and 85%, respectively. Significant improvements in wear resistance were achieved using UIT. However, an excessive vibration strike number on the per unit area (/mm2) might result in unwanted micro-cracks and delamination on the treated surface, deteriorating the performance of the coating. These findings validate that UIT parameters (such as the vibration strike number on per unit area) are of great importance to bringing about improvements in wear performance, and UIT is found to have a high potential in modifying the surface characteristics and optimizing the mechanical performances of the deposited coating for a wide range of potential applications.

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“…Thus, surface nanocrystallization techniques such as surface mechanical attrition treatment (SMAT) [9], shot peening (SP) [10], hammer peening [11], laser shock peening (LSP) [12] and ultrasonic impact treatment (UIT) [13] are more attractive and expected to present new ideas to realize materials' nanostructured layer in various surface protection applications.Compared with the other mechanical surface treatment techniques mentioned above, it is demonstrated that the UIT is more convenient and economical and controllable to rapidly realize surface nanocrystallization over a large area [13,14]. Up to now, UIT has been more widely used to eliminate the welding residual stresses [14,15] being improved the microstructure of the near-surface region [16,17] and the fatigue behaviors of welded joints [18,19] through severe plastic deformation. Previous investigations reported that the UIT could generate compressive residual stress and refine the grains on surface layer of welded structures, resulting in the enhanced mechanical properties.…”

mentioning

confidence: 99%

Enhanced Wear Resistance of Iron-Based Alloy Coating Induced by Ultrasonic Impact

Zhao

Zhang

et al. 2019

Coatings

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Wear failures of components often occur and cause great economic losses in modern industry production. To obtain excellent wear resistance surface will help reduce the abrasion. Herein, a wear-resistant iron-based alloy coating was deposited on a low-carbon steel substrate by argon arc overlaying, and sequentially surface nanocrystallized through ultrasonic impact treatment (UIT). Micro-structural, mechanical property (including nanohardness and elastic modulus) and wear behavior changes of the coating before and after UIT were experimentally investigated. In addition, the wear mechanism variation owing to the application of UIT was discussed. The results show that a highly deformed nanocrystalline layer with an average grain size in the range of~100 nm was generated at a depth of approximately 34 µm from the treated coating surface, which contains a certain amount of the deformation-induced α'-martensite phase. Compared with the as-deposited coating, the coating after UIT processing exhibits considerable improvements in the ratio of nanohardness (H) to elastic modulus (E) and better wear resistance under the same wear test conditions. The wear mechanism has also changed from the adhesive type of the as-deposited coating to an abrasive type on the introduction of a nanocrystalline microstructure.have demonstrated that coatings with thicknesses on the order of millimeters produced by argon arc surfacing welding exhibit a dense microstructure, excellent strength and toughness as well as high wear resistance. Such coatings can even replace entire components and significantly improve the wear resistance [6]. Iron-based alloys known as their low cost and excellent comprehensive properties have drawn much attention and shown great potential application in different fields of industries [7,8]. Therefore, iron-based alloy coating on easy wear parts and components has positive contribution to extend their service life and improve their service performance. Unfortunately, high residual stress and deformation introduced during overlaying may change the shape and the size of components, which limits their use in certain demanding conditions. In this sense, appropriate surface treatment is crucial for the performance improvement of overlaying coating.Surface nanocrystallization owing to their unique microstructural characteristics exhibits superior physical, chemical, and mechanical properties and have attracted considerable interest as a viable alternative in protection applications [9]. Thus, surface nanocrystallization techniques such as surface mechanical attrition treatment (SMAT) [9], shot peening (SP) [10], hammer peening [11], laser shock peening (LSP) [12] and ultrasonic impact treatment (UIT) [13] are more attractive and expected to present new ideas to realize materials' nanostructured layer in various surface protection applications.Compared with the other mechanical surface treatment techniques mentioned above, it is demonstrated that the UIT is more convenient and economical and controllable to rapidly realize s...

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Surface Plastic Deformation and Nanocrystallization Mechanism of Welded Joint of 16MnR Steel Treated by Ultrasonic Impact

Cited by 4 publications

References 16 publications

Surface Quality and Microstructure of Welded Joint of 12Cr1MoV Steel by Ultrasonic Peening

Surface Quality and Microstructure of Welded Joint of 12Cr1MoV Steel by Ultrasonic Peening

Enhanced Wear Behavior of a Stainless Steel Coating Deposited on a Medium-Carbon Low-Alloy Steel Using Ultrasonic Impact Treatment

Enhanced Wear Resistance of Iron-Based Alloy Coating Induced by Ultrasonic Impact

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