Effect of laser-assisted nitriding with a high-power diode laser on surface hardening of aluminum-containing martensitic steel

Sim, Ahjin; Park, Chankyoo; Kang, Ning; Kim, Jae Won; Chun, Eun−Joon

doi:10.1016/j.optlastec.2019.03.040

Cited by 16 publications

(8 citation statements)

References 26 publications

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“…Iron nitrides and carbonitrides were the main strengthening phases detected. A diode laser was used for a similar purpose: to strengthen the steel AISI P21 (USA) [20]. There was a 40 % increase in surface hardness than untreated material, which is much less compared to previous work [19].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…For steels, the greatest strength, hardness, and wear resistance are achieved by nitriding. The review of studies [19][20][21][22][23][24][25][26][27][28] shows the high efficiency of the combined technology of nitriding+laser processing. This avoids the disadvantages of "classic" nitriding, hardens the material under a nitrided layer, and increases the diffusion layer's thickness.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Improving the wear resistance of heavy-duty elements in tribomechanical systems by a combined laser-thermochemical processing method

Киндрачук

Духота

Тіsov

et al. 2021

EEJET

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This paper reports an analysis of the state of tribological support in the aviation industry. The use of surface strengthening technologies to extend the resource of friction node parts has been prioritized. Modern combined technologies of nitriding and laser treatment of steel surfaces have been reviewed. The mechanism has been elucidated that damages steel 30H2NVFA in the jackscrew actuator of transport aircraft flaps, which occurs due to insufficient surface hardness of the material after a generally accepted heat treatment. Auger electron spectroscopy analysis revealed a high concentration of oxygen on the surface: up to 41.4 at. %; the friction surface carbonation has been detected, especially significant at the surface of the pitting damage. A comprehensive technology of surface strengthening by nitriding+laser selective hardening has been suggested. The radiation power was 1 KW, the diameter of the focus spot was 2.5 mm, and the pitch between the focus spot centers was 2.5 mm. The total area of laser processing was 70 %. The steel temperature exceeded Ас3 and corresponded to the hardening temperature range. The depth of the nitrided layer increased to 400 µm, the maximum hardness on the surface was 1,350–1,380 HV0.2. The formation of a solid nitrided layer with a thickness of 200‒250 µm was observed, as well as a transition zone composed of column-shaped iron nitrides, which are introduced into the matrix material. As a result, a sharp gradient in the mechanical properties disappears. The tests confirmed that the wear resistance of the comprehensively treated surface was 2.1 times higher under dry friction conditions, and 4.5 times higher when lubricated with the "Era" grease (RF), compared with the 30H2NVFA steel nitrided by the conventional technology. In addition, there was no fragile destruction of the surface; the interaction with oxygen reduced significantly

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the wear resistance of heavy-duty elements in tribomechanical systems by a combined laser-thermochemical processing method

Киндрачук

Духота

Тіsov

et al. 2021

EEJET

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“…Appropriate surface treatments can prevent damages to the mold, resulting in an extended mold lifespan. Several studies have investigated the application of surface treatments to mold steels and tool steels in the form of surface heat-treatment [2][3][4][5], nitriding [3,[6][7][8], surface coating and alloying [9][10][11][12], and peening [5,13,14]. Lee et al [2] investigated the laser melting-induced microstructural evolution and surface hardening of SM45C mold steel.…”

Section: Introductionmentioning

confidence: 99%

“…However, only a few studies have reported the influence of surface treatments on the microstructure, mechanical properties, and functional properties of AISI P21 mold steel. Our previous studies [3,7] investigated the influence of laser heat-treatment and laser nitriding on the microstructure and microhardness of P21 steel. These studies revealed that the laser heat-treatment did not induce surface hardening, and the laser nitriding parameters affected the microhardness and nitriding thickness.…”

Section: Introductionmentioning

confidence: 99%

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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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Mechanism of surface corrosion resistance of 304 stainless steel processed by nanosecond laser pulses

Yang

Wang

Xiong

et al. 2022

Materials & Corrosion

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A nanosecond pulsed fiber laser was used to modify the surface of 304 stainless steel. The compactness, microstructure, chemical composition, and corrosion resistance of the stainless steel passive film were observed by the blue dot detection method, scanning electron microscopy, x-ray photoelectron spectroscopy, and electrochemical methods. The influence of different laser fluences on the stability and corrosion resistance of the stainless steel passive film was studied. The results show that with increasing laser fluence, the discoloration reaction time of the stainless steel surface increases first and then decreases, while the surface roughness decreases first and then increases.

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Effect of laser-assisted nitriding with a high-power diode laser on surface hardening of aluminum-containing martensitic steel

Cited by 16 publications

References 26 publications

Improving the wear resistance of heavy-duty elements in tribomechanical systems by a combined laser-thermochemical processing method

Improving the wear resistance of heavy-duty elements in tribomechanical systems by a combined laser-thermochemical processing method

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

Mechanism of surface corrosion resistance of 304 stainless steel processed by nanosecond laser pulses

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