Surface hardening of shot peened H13 steel by enhanced nitrogen diffusion

Cho, Kyun Taek; Song, Kyung; Oh, Sang Ho; Lee, Young Kook; Lee, Won Beom

doi:10.1016/j.surfcoat.2013.06.123

Cited by 45 publications

(13 citation statements)

References 26 publications

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“…1 reveal the prominent hardening effect caused by laser shock. The basic strengthening principle of LSP is work hardening, which is same with the conventional surface strengthening technology [23]. Due to the higher impact strength produced by repeated shocks, the sample treated by three impacts was with a deeper hardening layer in comparison with those suffered less impacts.…”

Section: Surface Hardening Effect Brought By Laser Shockmentioning

confidence: 99%

Effect of laser shock on tensile deformation behavior of a single crystal nickel-base superalloy

Liu

Qiao

et al. 2017

Materials Science and Engineering: A

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Section: Surface Hardening Effect Brought By Laser Shockmentioning

confidence: 99%

Effect of laser shock on tensile deformation behavior of a single crystal nickel-base superalloy

Liu

Qiao

et al. 2017

Materials Science and Engineering: A

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“…Scuracchio et al [13] demonstrated that the use of a high intensity shot peening treatment using 0.8 mm shots followed by a second peening treatment with 0.3 mm diameter shots led to the optimal fatigue performance regarding fatigue life in a Q+T 9245 steel with a hardness of 500 HB. Cho et al [15] applied shot peening as a pre-treatment to cause severe plastic deformation to enhance nitrogen diffusion at lower temperatures in a second nitriding treatment. Anyway, polishing is currently the usual technique employed as a second treatment [16,17]: polishing benefits in surface quality outweight the disadvantage of a slight reduction in the compression residual stress layer thickness of the shot peened component, but nevertheless, it has the drawbacks of being both an expensive and slow process.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Fatigue Behavior in Quenched and Tempered High-Strength Steel by Means of Double Surface Treatments

Segurado

Belzunce

Fernández

2019

J. of Materi Eng and Perform

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The aim of this study is to maximize the fatigue life of a high strength steel. For this purpose, two different kinds of double surface treatments were studied: shot peening plus vibratory finishing and shot peening plus grit blasting. First, a high intensity peening treatment was applied, with the aim of inducing a deep region submitted to high compressive residual stresses, and a second surface treatment followed, to reduce the roughness induced in the first treatment and mitigate the damage produced on the specimen surface. The use of such double treatments was demonstrated to be a good choice to achieve high surface hardening and deep compressive residual stress profiles and to minimize surface defects. The fatigue life of the steel was greatly enhanced following the application of both double surface treatments. A vibratory treatment applied for 24 hours after the application of a previous shot peening treatment was able to increase the average fatigue life of the single shot peened samples almost sevenfold, but a much greater fatigue enhancement was produced using grit blasting for only 60 seconds. Anyway, both second treatments are able to remove the damaged surface layer produced in the first high intensity shot peening treatment. The obtained results also revealed that an appropriate combination of surface treatments (shot peening+secondary treatment) avoided the initiation of cracks at the surface of the specimens under cyclic bending loads. Instead, crack initiation took place beneath the compressive residual stress field, induced in alumina inclusions that acted as stress concentrators.

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“…A marginal peak shifting toward a lower 2θ value was observed for the LH P21 and LN P21 in comparison to the BM, as shown in Figure 4b. The shift in the XRD peak can be attributed to the presence of compressive residual stress, surface hardening, and grain refinement after laser treatments [28,[31][32][33][34].…”

Section: Resultsmentioning

confidence: 99%

Effect of Laser Heat-Treatment and Laser Nitriding on the Microstructural Evolutions and Wear Behaviors of AISI P21 Mold Steel

Shin

Yoo

Kim

et al. 2020

Metals

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Laser heat-treatment and laser nitriding were conducted on an AISI P21 mold steel using a high-power diode laser with laser energy densities of 90 and 1125 J/mm2, respectively. No change in surface hardness was observed after laser heat-treatment. In contrast, a relatively larger surface hardness was measured after laser nitriding (i.e., 536 HV) compared with that of the base metal (i.e., 409 HV). The TEM and electron energy loss spectroscopy (EELS) analyses revealed that laser nitriding induced to develop AlN precipitates up to a depth of 15 μm from the surface, resulting in surface hardening. The laser-nitrided P21 exhibited a superior wear resistance compared with that of the base metal and laser heat-treated P21 in the pin-on-disk tribotests. After 100 m of a sliding distance of the pin-on-disk test, the total wear loss of the base metal was measured to be 0.74 mm3, and it decreased to 0.60 mm3 for the laser-nitrided P21. The base metal and laser heat-treated P21 showed similar wear behaviors. The larger wear resistance of the laser-nitrided P21 was attributed to the AlN precipitate-induced surface hardening.

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Surface hardening of shot peened H13 steel by enhanced nitrogen diffusion

Cited by 45 publications

References 26 publications

Effect of laser shock on tensile deformation behavior of a single crystal nickel-base superalloy

Effect of laser shock on tensile deformation behavior of a single crystal nickel-base superalloy

Enhanced Fatigue Behavior in Quenched and Tempered High-Strength Steel by Means of Double Surface Treatments

Effect of Laser Heat-Treatment and Laser Nitriding on the Microstructural Evolutions and Wear Behaviors of AISI P21 Mold Steel

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