A review on effects of nitriding of AISI409 ferritic stainless steel

Tadepalli, Lakshmi Deepak; Gosala, Ananda Mithra; Kondamuru, Lokesh; Bairi, Sai Chandra; Subbiah, Ram; Singh, Swadesh Kumar

doi:10.1016/j.matpr.2020.01.299

Cited by 22 publications

(4 citation statements)

References 12 publications

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“…In the solute state approach, HNS is produced by long-term HTSN in a nitrogen gas atmosphere at 1000 °C-1200 °C [1,2,[17][18][19][20]. The HTSN process allows the dissolution of high nitrogen contents (∼0.5-1.0 wt%) in austenite [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Isothermal aging treatment and its effect on the mechanical properties of Fe-Cr-Mn high-nitrogen austenitic steel

Ararat,

Erişir

2024

Mater. Res. Express

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The high-temperature solution nitriding process is a suitable treatment for producing high-nitrogen steels by the diffusion of nitrogen from the surface to the center of steels under high nitrogen pressure at high temperatures. On the other hand, long-term solution nitriding at high temperatures can cause the formation of coarse-grained austenite. This study focused on the grain size, strength, and elongation properties of Fe-Cr-Mn high-nitrogen austenitic steels by isothermal aging. For this purpose, we produced high-nitrogen steels by three-step phase transformations: i) high-temperature solution nitriding, ii) isothermal aging, and iii) reaustenitization. After solution nitriding, high-nitrogen austenitic steel was treated with isothermal aging to induce austenite decomposition. Supersaturated austenite (ϒ) transformed to less nitrogen-saturated austenite (ϒ’) and discontinuous cellular precipitation (DCP) during the isothermal aging treatment. Subsequently, the decomposed structure was reversed into austenite through reaustenitization. The results suggested that austenite grain refinement and increasing hardness were achieved by nucleating reversed austenite grains after reaustenitization treatment. On the other hand, a noticeable increase in elongation appeared after reaustenitization treatment for 30 min.

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Section: Introductionmentioning

confidence: 99%

Isothermal aging treatment and its effect on the mechanical properties of Fe-Cr-Mn high-nitrogen austenitic steel

Ararat,

Erişir

2024

Mater. Res. Express

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“…The formation of the nitrogen-expanded ferrite (α N ) phase, a metastable nitrogen-rich in the solid solution phase, predominates in ferritic stainless steel surfaces modified at low temperatures by conventional plasma nitriding (PN), while at high temperatures (above 400 • C), iron (ε -Fe 2−X N (0 ≤ x ≤ 1) and γ -Fe 4 N) and chromium nitrides (CrN and Cr 2 N) are the predominant phases [1][2][3][4][5][6]. The products of PN are highly influenced by the treatment temperature and chemical composition of the steel [7].…”

Section: Introductionmentioning

confidence: 99%

Identification of Expanded Austenite in Nitrogen-Implanted Ferritic Steel through In Situ Synchrotron X-ray Diffraction Analyses

Schibicheski Kurelo,

Lepienski,

de Oliveira

et al. 2023

Metals

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The existence and formation of expanded austenite in ferritic stainless steels remains a subject of debate. This research article aims to provide comprehensive insights into the formation and decomposition of expanded austenite through in situ structure analyses during thermal treatments of ferritic steels. To achieve this objective, we employed the Plasma Immersion Ion Implantation (PIII) technique for nitriding in conjunction with in situ synchrotron X-ray diffraction (ISS-XRD) for microstructural analyses during the thermal treatment of the samples. The PIII was carried out at a low temperature (300–400 °C) to promote the formation of metastable phases. The ISS-XRD analyses were carried out at 450 °C, which is in the working temperature range of the ferritic steel UNS S44400, which has applications, for instance, in the coating of petroleum distillation towers. Nitrogen-expanded ferrite (αN) and nitrogen-expanded austenite (γN) metastable phases were formed by nitriding in the modified layers. The production of the αN or γN phase in a ferritic matrix during nitriding has a direct relationship with the nitrogen concentration attained on the treated surfaces, which depends on the ion fluence imposed during the PIII treatment. During the thermal evolution of crystallographic phase analyses by ISS-XRD, after nitriding, structure evolution occurs mainly by nitrogen diffusion. In the nitrided samples prepared under the highest ion fluences—longer treatment times and frequencies (PIII 300 °C 6 h and PIII 400 °C 3 h) containing a significant amount of γN—a transition from the γN phase to the α and CrN phases and the formation of oxides occurred.

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“…Solutions include adding Mn to FSS to stabilize the austenitic microstructure at room temperature or assembling a hybrid form of ASS and FSS [2]. Furthermore, some surface thermal treatments such as nitriding or carburization can also reinforce the strength of the surface layer and thus improve their global mechanical performances [4].…”

Section: Introductionmentioning

confidence: 99%

Laser treatment of 430 ferritic stainless steel for enhanced mechanical properties

Wang

Dirrenberger

Lapouge

et al. 2022

Materials Science and Engineering: A

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A review on effects of nitriding of AISI409 ferritic stainless steel

Cited by 22 publications

References 12 publications

Isothermal aging treatment and its effect on the mechanical properties of Fe-Cr-Mn high-nitrogen austenitic steel

Isothermal aging treatment and its effect on the mechanical properties of Fe-Cr-Mn high-nitrogen austenitic steel

Identification of Expanded Austenite in Nitrogen-Implanted Ferritic Steel through In Situ Synchrotron X-ray Diffraction Analyses

Laser treatment of 430 ferritic stainless steel for enhanced mechanical properties

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