Improving surface mechanical properties of the selective laser melted 18Ni300 maraging steel via plasma nitriding

Hong, Yue; Dong, Dashen; Lin, Shisheng; Wang, W.; Tang, Chi; Kuang, Tongchun; Dai, Mingjiang

doi:10.1016/j.surfcoat.2020.126675

Cited by 22 publications

(10 citation statements)

References 35 publications

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“…Tang, T.C. Kuang, M.J. Dai [31] report an improvement in the hardness and wear resistance of maraging steel by performing plasma nitriding, during which a nitrided layer is formed.…”

Section: Resultsmentioning

confidence: 99%

Study of hardening and structure of maraging powder steel grade PS-H18K9M5TR (18%Ni+9%Co+5%Mo+1%Ti+1%Re+66%Fe)

Աղբալյան¹,

Simonyan²

2022

Scientific Herald of Uzhhorod University Series Physics

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Relevance. High-strength steels are increasingly in demand in modern industry for various applications. Maraging steels are the primary material in the manufacture of most aircraft parts as well as machine-building components. This type is low-carbon and is rich in nickel, which forms martensite when cooled as well as demonstrates properties such as high hardness, wear resistance, etc. The hardening process is the main factor affecting the functional properties of maraging steel. At certain temperatures, austenite has the ability to transform into various kinds of phases. However, the shortcoming that lies in the presence of some impurities limits the established types of improvement technologies, leading to the search for innovative methods to improve the characteristics of steel without losing any of the desired properties. Good qualities appear in maraging steels mainly after treatment with a solution at a temperature of about 1000℃ and during aging at a temperature of about 490℃. Purpose. Thus, the purpose of this research paper is to analyze the structure of maraging steel powders and study the thermal effect on its properties. Methodology. In this paper, powder steel was pressed by spark plasma sintering technology at a pressure of 60 MPa to a powder compact and heated at a temperature of 1100℃ for 180 s at a rate of 20℃/s, after which the samples underwent phase and elemental analysis, their hardness was measured, the value of which amounted to about 60 HRC. Results. The results of this scientific research demonstrate the presence of a variety of precipitates. The presence of impurities such as Co, Ti, and Re led to an improvement in strength due to martensitic phase transformation and precipitation hardening, as well as slowed down the diffusion process. Conclusions. In addition, tasks for further research on the issue of manufacturing maraging steels by the additive manufacturing method were identified. This technology enables obtaining strong maraging steels based on a powder mixture with the required characteristics

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“…Tang, T.C. Kuang, M.J. Dai [31] report an improvement in the hardness and wear resistance of maraging steel by performing plasma nitriding, during which a nitrided layer is formed.…”

Section: Resultsmentioning

confidence: 99%

Study of hardening and structure of maraging powder steel grade PS-H18K9M5TR (18%Ni+9%Co+5%Mo+1%Ti+1%Re+66%Fe)

Աղբալյան¹,

Simonyan²

2022

Scientific Herald of Uzhhorod University Series Physics

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“…Nitriding as heat treatments has been applied to steel materials and has been highly effective in improving their properties. On the other hand, several papers about nitriding for stainless steel and other steel materials produced by laser cladding, selective laser melting and powder bed fusion, have been published on the improvement of wear and other properties [53][54][55][56]. In this study, it was found for the first time that the WC composite stainless steel layers have dendritic secondary carbides and dissolved tungsten, but the S-phase is formed by low-temperature plasma nitriding.…”

Section: Summary and Perspectivesmentioning

confidence: 85%

Formation and Properties of Nitrocarburizing S-Phase on AISI 316L Stainless Steel-Based WC Composite Layers by Low-Temperature Plasma Nitriding

Adachi

Yamaguchi

Ueda

2021

Metals

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Stainless steel-based WC composite layers fabricated by a laser cladding technique, have strong mechanical strength. However, the wear resistance of WC composite layers is not sufficient for use in severe friction and wear environments, and the corrosion resistance is significantly reduced by the formation of secondary carbides. Low-temperature plasma nitriding and carburizing of austenitic stainless steels, treated at temperatures of less than 450 °C, can produce a supersaturated solid solution of nitrogen or carbon, known as the S-phase. The combined treatment of nitriding and carburizing can form a nitrocarburizing S-phase, which is characterized by a thick layer and superior cross-sectional hardness distribution. During the laser cladding process, free carbon was produced by the decomposition of WC particles. To achieve excellent wear and corrosion resistance, we attempted to use this free carbon to form a nitrocarburizing S-phase on AISI 316 L stainless steel-based WC composite layers by plasma nitriding alone. As a result, the thick nitrocarburizing S-phase was formed. The Vickers hardness of the S-phase ranged from 1200 to 1400 HV, and the hardness depth distribution became smoother. The corrosion resistance was also improved through increasing the pitting resistance equivalent numbers due to the nitrogen that dissolved in the AISI 316 L steel matrix.

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“…In their research paper, the authors have emphasized that post-built solution-treatment itself (without nitriding) could not give such significant impact as the surface treatment. For 18Ni300 maraging steel fabricated by selective laser melting, Y. Hong et al [18] noted the improvement of the surface mechanical properties due to the simultaneous effects of aging and nitriding in one process of ion-plasma treatment. The authors also pointed out that the direct nitriding of the as-fabricated sample without heat treatment provides the best surface mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ion-Plasma Nitriding on Phase Composition and Tensile Properties of AISI 321-Type Stainless Steel Produced by Wire-Feed Electron-Beam Additive Manufacturing

Moskvina

Астафурова

Астафуров

et al. 2022

Metals

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We study the effect of ion-plasma surface nitriding on the phase composition, microstructure, surface microhardness, and tensile properties of the AISI 321-type stainless steel produced by wire-feed electron-beam additive manufacturing (EBAM). Ion-plasma nitriding at 550 °C for 12 h in N2/H2 gases provides the formation of a 10-μm thick surface layer with solid solution strengthening by nitrogen atoms (Fe-γN и Fe-αN) and dispersion hardening (γ’-Fe4N) with a fivefold increase in surface hardness up to ≈12 GPa. Surface ion-plasma nitriding of additively produced steel does not affect the anisotropy of mechanical properties, but rather increases the yield strength and ultimate tensile strength while maintaining high plasticity in the specimens. In specimens after ion-plasma nitriding, the fracture mechanism changes from initially ductile to a quasi-brittle fracture near the surface and ductile transgranular mode in the central parts of the specimens. The nitrided layer fractured in a transgranular brittle manner with the formation of quasi-cleavage facets and secondary cracks near the surface of the specimens. Brittle fracture of the compositional layer occurs due to the complex solid solution strengthening and particle hardening of austenite.

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Improving surface mechanical properties of the selective laser melted 18Ni300 maraging steel via plasma nitriding

Cited by 22 publications

References 35 publications

Study of hardening and structure of maraging powder steel grade PS-H18K9M5TR (18%Ni+9%Co+5%Mo+1%Ti+1%Re+66%Fe)

Study of hardening and structure of maraging powder steel grade PS-H18K9M5TR (18%Ni+9%Co+5%Mo+1%Ti+1%Re+66%Fe)

Formation and Properties of Nitrocarburizing S-Phase on AISI 316L Stainless Steel-Based WC Composite Layers by Low-Temperature Plasma Nitriding

Effect of Ion-Plasma Nitriding on Phase Composition and Tensile Properties of AISI 321-Type Stainless Steel Produced by Wire-Feed Electron-Beam Additive Manufacturing

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