Effect of ultrasonic nanocrystal surface modification on the characteristics of AISI 310 stainless steel up to very high cycle fatigue

Khan, Muhammad Kashif; Liu, Y.J.; Wang, Hongtao; Pyun, Young Sik; Kayumov, Ravil

doi:10.1111/ffe.12367

Cited by 14 publications

(18 citation statements)

References 23 publications

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“…The surface residual stress was 100 MPa when no static force was used in the simulation. The surface residual stress increased with contact force, by 100%, 115%, and 130% for 15, 30, and 45 N static forces, respectively. There was no significant effect of static force on maximum subsurface stress and depth of transition of compressive to tensile stresses.…”

Section: Resultsmentioning

confidence: 96%

“…The UNSM‐treated specimens were cyclically loaded at load ratio R = −1 with 20 kHz ultrasonic frequency. More details of the specimen geometry and fatigue testing are reported elsewhere …”

Section: Resultsmentioning

confidence: 99%

“…The UNSM impact force develops dislocations and nanocrystalline grain layers on the surface of material . The density of dislocations and depth of nanocrystalline grain layers increase the hardness of the materials . The hardness of the surface and the depth of the hardened layer depend on the plastic properties of the target material.…”

Section: Resultsmentioning

confidence: 99%

“…Finite element (FE) simulations of surface treatment processes have been used for investigations of the relationship between surface treatment process parameters and fatigue performance of engineering alloys . Experimental and FE studies of UNSM on hardening and residual stresses of various engineering alloys are still scarce …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of ultrasonic nanocrystal surface modification on residual stress and fatigue cracking in engineering alloys

Khan

Fitzpatrick

Wang

et al. 2017

Fatigue Fract Eng Mat Struct

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The effects of ultrasonic nanocrystal surface modification (UNSM) on residual stresses and fatigue crack initiation were investigated in various engineering alloys. It was found that higher contact force and smaller pin in UNSM produced higher compressive residual stresses at the surface and subsurface of the alloys. The compressive residual stresses were found to be higher in high yield strength alloys. A deeper compressive residual stress field was observed in alloys with higher elastic modulus and strain hardening exponent. Fatigue crack initiation was found to occur subsurface in the material where the effect of UNSM hardening was saturated. It was concluded that deeper UNSM hardening produces higher fatigue life.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of ultrasonic nanocrystal surface modification on residual stress and fatigue cracking in engineering alloys

Khan

Fitzpatrick

Wang

et al. 2017

Fatigue Fract Eng Mat Struct

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“…A large number of studies suggested that the fatigue strength of a material is proportional to its tensile strength and the fatigue crack that results in final failure usually initiates at the surface of the material [1][2][3]. In order to upgrade the fatigue strength of engineering materials/components, investigators have used surface strengthening techniques in the applications of aviation, automobile and high-speed railway [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Zhang

Xie

Jiang

et al. 2017

Materials Science and Engineering: A

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A B S T R A C TThis paper experimentally investigated the behavior of fatigue crack growth of an axle steel with a surface strengthened gradient microstructure layer. First, the microstructure, residual stress and mechanical properties were examined as a function of depth from surface. Then the fatigue crack growth rate was measured via three point bending fatigue testing. The results indicated that fatigue crack growth rate decelerated first and then accelerated with the increase of crack length within the gradient layer. Especially, the fatigue crack was arrested in the gradient layer under relatively low stress amplitude due to the increase of threshold value for crack growth within the range of 3 mm from surface. Based on these results, the parameters of Paris equation and the threshold value of stress intensity factor range within the gradient layer were determined and a curved surface was constructed to correlate crack growth rate with stress intensity factor range and the depth from surface. The effects of microstructure, residual stress and surface notch on the crack growth behavior were also discussed.

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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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Effect of ultrasonic nanocrystal surface modification on the characteristics of AISI 310 stainless steel up to very high cycle fatigue

Cited by 14 publications

References 23 publications

Effect of ultrasonic nanocrystal surface modification on residual stress and fatigue cracking in engineering alloys

Effect of ultrasonic nanocrystal surface modification on residual stress and fatigue cracking in engineering alloys

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

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

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