Direct laser hardening of AISI 1020 steel under controlled gas atmosphere

Maharjan, Niroj; Zhou, Wei; Wu, Naien

doi:10.1016/j.surfcoat.2020.125399

Cited by 45 publications

(18 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…e average microhardness measured (3 measurements at the same depth) over the cross section of the LQ samples was characterized by decreasing hardness from the surface towards the center of the substrate. As expected, a sudden drop in hardness at the end of the martensitic zone (760 μm) was observed for the LQ sample (see Figure 5(a)); this type of behavior is due to the type of atmosphere (air) used for the treatment, as demonstrated recently by Maharjan et al [17]. On the other hand, as shown in Figure 5(b), the hardness of the CQT sample remained similar beyond a depth of 1 mm.…”

Section: Resultssupporting

confidence: 82%

Surface Laser Quenching as an Alternative Method for Conventional Quenching and Tempering Treatment of 1538 MV Steel

Carrera-Espinoza

Valerio

Villasana

et al. 2020

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

This paper aims at encouraging the use of laser treatment as an environmentally friendly technique to improve the mechanical properties of metallic materials over conventional quenching and tempering techniques through the study of the tribological behavior of AISI 1538 MV steel subjected to surface laser quenching treatment. Sliding wear tests were carried out by the pin-on-disk method. In order to identify the wear mechanisms, the worn surfaces on the disks were evaluated by scanning electron microscopy and the wear scars on the ball were observed by optical microscopy. Results reveal that laser treatment reduces the average friction coefficient by 25% and the wear rate by 60% compared with those achieved by the conventional methods, while the depths of the wear track and hardness of the cross section and surface are maintained.

show abstract

Section: Resultssupporting

confidence: 82%

Surface Laser Quenching as an Alternative Method for Conventional Quenching and Tempering Treatment of 1538 MV Steel

Carrera-Espinoza

Valerio

Villasana

et al. 2020

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…9-10 that, the distribution exhibited a narrow gap on non-welded specimens while it exhibited wide gap after welding. And also, in 1020 steel, which is low hardenability steel because of its low carbon content, the hardness distribution does not show a wide range after welding, while the hardness range is very wide as expected in 6150 steel (Mendes et al, 2013;Maharjan et al, 2020). Narrow distributions refer to high reliability values.…”

Section: Reliability Analysismentioning

confidence: 75%

Efecto de la soldadura sobre la fiabilidad de las propiedades mecánicas en los materiales de acero AISI 1020 y AISI 6150

Çivi

İren

2021

revmetal

View full text Add to dashboard Cite

La soldadura es uno de los métodos de fabricación y reparación más importantes de la tecnología actual. Aunque se sabe que puede reducir las propiedades mecánicas de los materiales, es una necesidad en muchas áreas y, en algunos casos, se prefiere debido a la fabricación eficiente y rápida. El uso generalizado de la soldadura ha planteado el problema de la fiabilidad de la estructura soldada. Es importante llevar a cabo análisis de confiabilidad, especialmente en construcciones soldadas críticas o algunos materiales críticos. En este estudio se seleccionaron dos materiales de acero (AISI 1020 y AISI 6150) los cuales se seleccionaron con diferentes niveles de soldabilidad. La soldadura por arco metálico con gas (GMAW), la soldadura por arco con gas tungsteno (GTAW) y la soldadura por arco metálico protegido (SMAW) se eligieron como técnicas de soldadura industrial generalizadas. Se examinaron las propiedades mecánicas soldadas y no soldadas de estos materiales teniendo en cuenta la fiabilidad y se investigó el efecto de la soldadura y los métodos de soldadura. Los análisis de confiabilidad revelaron que las propiedades mecánicas y microestructuras no predecibles son la característica principal del proceso de soldadura, especialmente en algunos materiales o métodos.

show abstract

“…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%

“…Compared to conventional nitriding, there is an increase in hardness by 14 % and wear resistancetwice. Nitrogen replacement with other gases also had a significant effect [23]. Thus, argon is inert and has little impact on the additional hardness: strengthening effect is achieved by quenching the surface.…”

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

View full text Add to dashboard Cite

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

show abstract

Direct laser hardening of AISI 1020 steel under controlled gas atmosphere

Cited by 45 publications

References 30 publications

Surface Laser Quenching as an Alternative Method for Conventional Quenching and Tempering Treatment of 1538 MV Steel

Surface Laser Quenching as an Alternative Method for Conventional Quenching and Tempering Treatment of 1538 MV Steel

Efecto de la soldadura sobre la fiabilidad de las propiedades mecánicas en los materiales de acero AISI 1020 y AISI 6150

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

Contact Info

Product

Resources

About