Characterization of surface mechanical properties of H13 steel implanted by plasma immersion ion implantation

Saklakoğlu, Nurşen

doi:10.1016/j.jmatprotec.2007.02.014

Cited by 19 publications

(7 citation statements)

References 20 publications

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“…Apparently, nitrogen addition increases the lattice distortion of the matrix, i.e., nitrogen enhances the solid solution strengthening effect of tempered steel. In addition, as the tempering temperature increases, the lattice distortion of the Fe matrix decreases as the amount of nitrogen existing as solid-solution state decreases, which is consistent with previous research [33]. …”

Section: Lattice Distortionsupporting

confidence: 91%

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Chen

2017

Metals

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Abstract:The microstructure and strengthening-toughening mechanism of a modified 4Cr5Mo2V hot-working die steel with nitrogen (0.08% N) were investigated using hardness and toughness measurements, optical microscopy, scanning electron microscopy, X-ray diffraction experiments, transmission electron microscopy, and dilatometry. The results showed that the nitrogen addition could increase the hardness and temperability of 4Cr5Mo2V steel without toughness loss with a suitable heat treatment procedure. The fair match of high strength and toughness of the nitrogen-alloyed 4Cr5Mo2V steel is associated with the refinement of the prior austenite grain, the solution hardening of nitrogen atoms, and the increase of retained austenite. Before quenching, nitrogen tends to precipitate in the form of a large amount of undissolved finer V(C, N), imposing a stronger effect on restricting the growth of prior austenitic grains and increasing the grain refining efficiency of VC by 6.8 times according to an estimate. During the quenching process, the nitrogen decreases the M S of the martensitic transformation, increasing retained austenite, which is a benefit for toughness. During the tempering process, some of the N atoms in M(C, N) were dissolved in the matrix, causing crystal lattice distortions, thus boosting the solution reinforcing effect. Meanwhile, the solid-dissolved nitrogen inhibits the diffusion of carbon, decreasing the growth rate of the carbides and increasing tempering resistance.

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Section: Lattice Distortionsupporting

confidence: 91%

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Chen

2017

Metals

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“…The nitriding of AISI H13 hot work tool steel has also been intensively studied leading to enhanced surface hardness, thermal fatigue, and corrosion resistance. [5,6,20,21,22,23] In recent works, the mechanism of N diffusion at both low temperatures and short nitriding times (up to 5 hours) were reported by our group. Those studies were focused on the formation of the compound layer and of the diffusion zone as well as on the effect of the nitriding gas mixture (N 2 to H 2 ratio), nitriding temperature, and ion current density.…”

Section: Introductionmentioning

confidence: 61%

Nanosized precipitates in H13 tool steel low temperature plasma nitriding

Zagonel

Bettini

Basso

et al. 2012

Surface and Coatings Technology

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A comprehensive study of pulsed nitriding in AISI H13 tool steel at low temperature (400°C) is reported for several durations. X-ray diffraction results reveal that a nitrogen enriched compound (-Fe 2-3 N, iron nitride) builds up on the surface within the first process hour despite the low process temperature. Beneath the surface, X-ray Wavelength Dispersive Spectroscopy (WDS) in a Scanning Electron Microscope (SEM) indicates relatively higher nitrogen concentrations (up to 12 at.%) within the diffusion layer while microscopic nitrides are not formed and existing carbides are not dissolved. Moreover, in the diffusion layer, nitrogen is found to be dispersed in the matrix and forming nanosized precipitates. The small coherent precipitates are observed by High-Resolution Transmission Electron Microscopy (HR-TEM) while the presence of nitrogen is confirmed by electron energy loss spectroscopy (EELS). Hardness tests show that the material hardness increases linearly with the nitrogen concentration, reaching up to 14.5 GPa in the surface while the Young Modulus remains essentially unaffected. Indeed, the original steel microstructure is well preserved even in the nitrogen diffusion layer. Nitrogen profiles show a case depth of about ~43 m after nine hours of nitriding process. These results indicate that pulsed plasma nitriding is highly efficient even at such low temperatures and that at this process temperature it is possible to form thick and hard nitrided layers with satisfactory mechanical properties. This process can be particularly interesting to enhance the surface hardness of tool steels without exposing the workpiece to high temperatures and altering its bulk microstructure.

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“…12 The expanded iron phase which shows excessive solid solution by nitrogen ions is a typical characteristic of PIII treated stainless steel and some ferritic or martensitic steels. 4,10,[13][14][15] In this study, it was not determined. Therefore, it is possible to infer that the presence of iron nitrides (especially Fe 4 N) is determinant to produce the higher hardness, with a minor contribution of solid solution phase.…”

Section: Hardnessmentioning

confidence: 99%

“…7 There have been a small number of studies of tool or mould steels treated by PIII. [8][9][10] In this paper, the results of plasma immersion ion implanted AISI 8620 steel, including wear and friction characteristics, hardness improvements and microstructure and phase developments, are reported. AISI 8620 is a hardenable chromium, molybdenum, nickel low alloy steel often used for carburising to develop a case hardened part.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of surface properties of AISI 8620 by plasma immersion ion implantation

Saklakoğlu¹

2008

Surface Engineering

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In this study, AISI 8620 steel samples were implanted with nitrogen using plasma immersion ion implantation (PIII) at 320, 380 or 450uC. In addition, PIII was used for simultaneous implantation of carbon and nitrogen into the steel at 380 or 450uC. Treated and untreated samples were studied by wear friction testing, microhardness measurement, atomic force microscopy, SEM study and glancing angle X-ray diffraction diagnosis. Experimental results indicated that the friction coefficient increased after PIII treatment and wear reduced by a factor of 4-60 for PIII treatment with pure nitrogen, although carbonznitrogen coimplantation increased the wear rate.

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Characterization of surface mechanical properties of H13 steel implanted by plasma immersion ion implantation

Cited by 19 publications

References 20 publications

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Nanosized precipitates in H13 tool steel low temperature plasma nitriding

Enhancement of surface properties of AISI 8620 by plasma immersion ion implantation

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