Investigation on liquid bath nitriding of selected steels

Balikci, Ercan; Yaman, Özgür

doi:10.1179/1743294411y.0000000034

Cited by 11 publications

(7 citation statements)

References 36 publications

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“…Tokom procesa može se očuvati dimenzionalna stabilnost obratka, pa je moguća obrada gotovih delova [26]. Veličina pora povećava se pri višim temperaturama, a nastaju kao rezultat akumulacije intersticijski rastvorenih atoma azota na preferencijalnim mestima, kao što su granice zrna, da bi se formirao molekularni azot [37]. Ghelloudj je sa saradnicima [38] pokazao da nitridi ε-Fe 2-3 (N,C) i γ'-Fe 4 (N,C) prisutni u sloju jedinjenja AISI 4140 povećavaju mikrotvrdoću (406-502 HV 0.3 ), a početne vrednosti hrapavosti površine nitriranih uzoraka su bile veće od uzoraka bez nitriranja.…”

Section: Područje Primeneunclassified

Directions of development and application of plasma nitriding in industry

Stojanović¹,

Stanisavljev²,

Erić³

2022

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This paper presents a discussion of the results of previous research of the effects of surface modification of structural materials and tool steels using plasma nitriding (PN) in order to improve their mechanical, tribological and corrosion behavior. The paper discusses the current status and future directions in the application of PN on various wearing components that are exposed to high loads, stresses and frequent temperature changes. The paper provides an overview of the relevant literature whose results show the most favorable or optimal parameters of the PN process aimed at achieving the best performance in terms of wear and corrosion resistance and hardness increase for the various materials considered. Systematization of literature data about research of the impact of low-temperature PN on stainless steels has placed emphasis on those process mechanisms that achieve benefits for surface layers without creating negative side effects in the form of loss of corrosion resistance. The strengthening of hot forging dies is considered through the reasons and problems that cause the need for the application of PN, and then paper focuses on the role of PN in achieving the tribological properties required to extend the service life of the die. Publications in which the nitriding of titanium alloys is investigated through the reduction of wear, increase of bearing capacity and microhardness depending on the input parameters of the process, ie the optimal parameters applied in order to obtain the best performance characteristics are cited. The application of PN to aluminum and its alloys is discussed, as well as the conditions of testing and the achieved improvements.

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Section: Područje Primeneunclassified

Directions of development and application of plasma nitriding in industry

Stojanović¹,

Stanisavljev²,

Erić³

2022

Zaštita materijala

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“…The hardness profile of the diffusion layer would be obviously increased due to the appearance of alloy nitrides, [13,16] and thinner compound layers have been observed when the content of the nitride-forming elements reaches some certain values. [11,16,17] It is inevitable that Cr-nitride (CrN) appears in the compound layer on nitride-high chromium steels. [18,19] The effect of the chromium nitride on the mechanical properties of the compound layer seems to be negative.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characteristics of the Compound Layer Cracked during Grinding on QPQ‐Treated Cr‐Containing Steel Shafts

et al. 2023

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Cr‐containing structural steels with quench‐polish‐quench (QPQ)‐treated surfaces are noticed having higher grinding cracking tendency compared to plain carbon steels. Herein, the compound layers of QPQ‐treated shafts produced from 20Cr and 40Cr steels by performing XRD, SEM, EDS, and microindentation measurements are investigated. The differences between the compound layers on the shafts with and without cracks are compared in morphology and element distribution. It is revealed that the basic reason of grinding cracking is the imperfect compound layer with serious porosities. The formation of serious porosities is mainly due to the inhibition of the outward diffusion of the nitrogen molecules from the nitride layer. Stronger nitride‐forming element Cr is considered to strengthen this inhibition.

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“…It is well established that nitrocarburising and boriding treatment of steels generate surfaces which causes considerable modification in the mechanical, tribological and corrosion properties [1,2]. Liquid nitrocarburising is a thermochemical treatment in which nitrogen and carbon are supplied simultaneously to ferrous alloy surfaces at temperatures between 823 K to 853 K, causing the formation of the compound layers ε-Fe 2-3 (C,N) and γ'-Fe 4 (C,N) followed by a diffusion zone [3,4].…”

Section: Introductionmentioning

confidence: 99%

Boriding and boronitrocarburising effects on hardness,wear and corrosion behavior of AISI 4130 steel

et al. 2019

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The effects of boriding and boronitrocarburising surface treatments on the microstructure and mechanical properties of AISI 4130 steel have been investigated. Pack boriding was carried out at 1223 K for 5 h and 8 h, while the double treatment of boronitrocarburising consisted of salt bath nitrocarburising at 853 K for 6 h followed by pack boriding at the same temperature and times as the boriding treatment. Microstructure examination of the borided and boronitrocarburised layers was carried out using optical and scanning electron microscopy, and phase identification was obtained using X-ray diffraction. Vickers hardness, wear and corrosion weight loss tests were used to evaluate the mechanical properties and corrosion behaviour. The results of X-ray diffraction analysis revealed the presence of superhard phases such as FeB, Fe 2 B, CrB, MnB and MnB 2 , indicating that pack boriding surface treatment conducted at 1223 K for 8 h exhibited the highest hardness, low coefficient of friction and the greatest wear resistance. Boronitrocarburising treatment, on the other hand, caused a reduction in both the depth of iron borides zone and mechanical properties compared to the boriding surface treatment. These recommended treatments offer to industrialists a particular contribution and interest in the development of these steels, which can be applied in various fields.

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Investigation on liquid bath nitriding of selected steels

Cited by 11 publications

References 36 publications

Directions of development and application of plasma nitriding in industry

Directions of development and application of plasma nitriding in industry

Microstructure Characteristics of the Compound Layer Cracked during Grinding on QPQ‐Treated Cr‐Containing Steel Shafts

Boriding and boronitrocarburising effects on hardness,wear and corrosion behavior of AISI 4130 steel

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