Microscopic Analysis of Effect of Shot Peening on Corrosion Fatigue Behavior of Aluminum Alloy

Kim, Jong Cheon; Cheong, Seong Kyun

doi:10.3795/ksme-a.2012.36.11.1381

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…Therefore, the user must select the mesh size considering the appropriate simulation time and error. These results are similar to those presented in the previous research results of Kim and Jung (2012), who studied the relationship between element size, effective characteristics, and analysis time [26]. To replace a real-test ROPS performance, the virtual test is required to be highly accurate.…”

Section: Simulation Test Results By Mesh Sizesupporting

confidence: 86%

Performance Evaluation of a Virtual Test Model of the Frame-Type ROPS for Agricultural Tractors Using FEA

Lim,

Kim,

et al. 2023

Agriculture

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In this study, a model of the frame-type ROPS (rollover protective structure) for an agricultural tractor was developed using FEA (finite-element analysis). Various boundary conditions were applied as input variables to replace the actual test of the ROPS with a virtual test. An optimization study was carried out based on the boundary conditions of the bolt, considering the ROPS part directly mounted on the tractor and the folding connection to the ROPS. The results of the virtual test were compared with those of the actual test, and the error was determined. The maximum error of the evaluation model was 7.0% for the force applied on the load and 9.6% for the corresponding ROPS deformation. All mounting bolts of the ROPS required modeling. In particular, we had to establish free boundary conditions for axial rotation to implement the folding connection. In addition, a simulation of the frame-type ROPS was conducted according to the mesh size. A convenient simulation time was obtained for a mesh size of 8~10 mm. Compared with the actual test, the accuracy was the highest with a mesh size of 6~8 mm.

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Section: Simulation Test Results By Mesh Sizesupporting

confidence: 86%

Performance Evaluation of a Virtual Test Model of the Frame-Type ROPS for Agricultural Tractors Using FEA

Lim,

Kim,

et al. 2023

Agriculture

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“…Chemical surface hardening includes nitriding, in which steel is heated in ammonia gas over an extended period of time to form a nitride layer [2][3][4][5][6], and carburizing, in which carbon penetrates the metal surface [5][6][7]. Physical surface hardening includes metal spraying, in which molten metals are attached to a surface by spraying them with compressed air [8,9]; induction hardening, in which a surface is hardened using high-frequency current and coolant injection [10]; and shot peening, in which the surface layer is hardened by injecting metals at high speed [11][12][13][14][15][16][17][18][19][20][21]. For D2 steel, physical surface hardening methods, such as shot peening and laser shock peening, have mainly been used.…”

Section: Introductionmentioning

confidence: 99%

“…Lee et al [11] applied shot peening to SCM920, a material for automotive gears, and confirmed an improvement in wear resistance. Kim et al applied shot peening to aluminum alloys and verified that compressive residual stress improved the fatigue life [12]. Cheong et al observed changes in the hardness of spring steel SPS 5A specimens with different hardness values by varying the shot peening parameters [13].…”

Section: Introductionmentioning

confidence: 99%

Method of ultrasonic nano-crystal surface modification for improvement of surface characteristics of AISI D2 heat-treated with different tempering conditions

Cho

Shim

2022

Int J Adv Manuf Technol

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AISI D2, an alloy tool steel, has been widely used as a cold-work die steel because of its excellent wear resistance, toughness, and machinability. However, when it is used as a mold or tool under a high load, high hardness and wear resistance are required to improve its service life. This study aimed to apply ultrasonic nanocrystal surface modification (UNSM), a local surface hardening technology, to the surface of D2 steel. To maximize the surface improvement effect achievable through UNSM, it is important to select the optimal process conditions according to the characteristics of the base metal.Therefore, the effects of UNSM were compared for different initial hardness values of D2 in this study.To this end, the base metal was subjected to different heat treatment conditions to exhibit different hardness values (approximately 40, 45, 50, and 55 HRc). Changes in the surface of the base metal were observed according to the three main parameters of the UNSM process: the load, inter-pass interval, and feed rate. No significant changes in the surface roughness and hardness was caused by the feed rate. As the inter-pass interval of UNSM decreased and the static load increased, the surface roughness of the base metal increased. However, the specimen with low initial hardness (D2-H40), the roughness improvement decreased as the load increased. On the other hand, the surface hardness improvement increased as the inter-pass interval decreased and the load increased regardless of the initial hardness of the base metal. It also was found that the specimen with the highest initial hardness (D2-H55) exhibited the greatest hardness improvement rate of 8.7 % and smallest hardened layer thickness of 220 μm. In addition, the largest compressive residual stress (-1,130.6 MPa) was formed on the surface of D2-H55 after UNSM, which occurred because the base metal with high initial hardness had limited plastic flow due to fine grains and low ductility, causing thus the energy repeatedly delivered Method of ultrasonic nanocrystal surface modification for improvement of surface characteristics of AISI D2 heat-treated with different tempering conditions Seung Yeong Cho 1,2 and Do Sik Shim 1,2, by UNSM to be concentrated in a limited area. Consequently, reducing the inter-pass interval is effective on improving the surface roughness and hardness regardless of the material hardness. However, the load must be applied at an appropriate level, depending on the material hardness. Therefore, when D2 is heat-treated and used according to the product requirements, it will be effective to consider the changes after UNSM treatment based on hardness after heat treatment that were derived in this study.

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“…Shot peening includes hot shot peening, which is performed near the austenite or martensite transformation temperature, and a water jet in which water is injected at a high speed for processing. Kim et al applied shot peening to aluminum alloys and verified that compressive residual stress improved the fatigue life [7]. In addition, the surface and mechanical characteristics have been improved using shot peening in many studies [8,9].…”

Section: Introductionmentioning

confidence: 99%

Strategy for Surface Post-Processing of AISI 316L Additively Manufactured by Powder Bed Fusion Using Ultrasonic Nanocrystal Surface Modification

Cho

Kim

Pyun

et al. 2021

Metals

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Ultrasonic nanocrystal surface modification (UNSM) technology was applied to the surfaces of specimens additively manufactured by powder bed fusion (PBF). The changes in roughness and hardness due to the UNSM were set as objective functions, and the optimal conditions for the main parameters were derived through the response surface method (RSM) and Box–Behnken design (BBD). Regression analysis-based mathematical models for predicting the surface hardness and roughness are presented and validated. The RSM results show that the surface roughness is highly dependent on the load and ball tip diameter, and the surface roughness significantly improves as the inter-pass interval and ball tip diameter decrease. Through BBD and ANOVA, the optimal conditions for the improvement of surface characteristics were found to be a load of 40 N, inter-pass interval of 10 μm, and ball tip diameter of 2.38 m. The surface treated under these optimal conditions exhibited a hardness of 497 Hv and surface roughness of 1.32 μm, which were significantly improved compared to the values for an untreated specimen. In addition, it was confirmed that the grains are significantly refined after UNSM, and scratch resistance increases for the top layer of the surface directly affected by the UNSM horn.

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Microscopic Analysis of Effect of Shot Peening on Corrosion Fatigue Behavior of Aluminum Alloy

Cited by 6 publications

References 13 publications

Performance Evaluation of a Virtual Test Model of the Frame-Type ROPS for Agricultural Tractors Using FEA

Performance Evaluation of a Virtual Test Model of the Frame-Type ROPS for Agricultural Tractors Using FEA

Method of ultrasonic nano-crystal surface modification for improvement of surface characteristics of AISI D2 heat-treated with different tempering conditions

Strategy for Surface Post-Processing of AISI 316L Additively Manufactured by Powder Bed Fusion Using Ultrasonic Nanocrystal Surface Modification

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