Formation of a nanostructured CrN layer on nitrided tool steel by low-temperature chromizing

Cao, Huiliang; Luo, Cheng; Liu, J.W.; Wu, C.L.; Zou, Gaopeng

doi:10.1016/j.scriptamat.2007.12.027

Cited by 10 publications

(10 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 h), the grain boundaries of carbides are nearly covered with nitride particles, which is in line with other investigations. 2,19,25 This can be correlated to the formation of higher amount of nitride phases with increasing plasma nitriding time. 2,13 Fig.…”

Section: Structural and Phase Analysismentioning

confidence: 98%

“…In another research, Cr (N, C) diffusion coating was formed on H13 tool steel, and the thickness and structure of the layers were investigated. 6 In addition, nanostructured CrN coating Centre of Excellence for Advanced Materials & Processing, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran *Corresponding author, email mansour_soltanieh@iust.ac.ir was formed on nitrided tool steel by low temperature chromising, and its formation mechanism was discussed by Cao et al 24 However, no investigation or discussion was made on corrosion resistance of the coating. 24 Plasma nitriding of hard chromium electroplated H11 steel aimed at improving corrosion resistance of the coating was investigated by Soltanieh et al 19 It was found that surface cracks were relatively covered after plasma nitriding.…”

Section: Introductionmentioning

confidence: 99%

“…6 In addition, nanostructured CrN coating Centre of Excellence for Advanced Materials & Processing, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran *Corresponding author, email mansour_soltanieh@iust.ac.ir was formed on nitrided tool steel by low temperature chromising, and its formation mechanism was discussed by Cao et al 24 However, no investigation or discussion was made on corrosion resistance of the coating. 24 Plasma nitriding of hard chromium electroplated H11 steel aimed at improving corrosion resistance of the coating was investigated by Soltanieh et al 19 It was found that surface cracks were relatively covered after plasma nitriding. However, nanosized chromium nitride coating was not detected on the surface of the material.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of plasma nitriding on nanostructure of TRD coating

Fesahat

Soltanieh

Eivani

2016

Surface Engineering

View full text Add to dashboard Cite

In this study, the effect of conventional plasma nitriding on chromised tool steel was investigated. The samples were chromised at 11008C for 12 h using thermoreactive diffusion/deposition (TRD). Subsequent tof TRD, specimens were nitrided at 6008C using a DC plasma set-up. Phase composition and surface morphology of the coatings were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) respectively. Corrosion resistance of the samples was investigated by polarisation corrosion test. X-ray diffraction analysis indicated that after chromising, the coating mainly consisted of Cr 7 C 3 , Cr 23 C 6 and Fe 3 C and surface hardness increased from 330 to 1400 HV 0.01 . However, after plasma nitriding, nanosized Cr 2 N, CrN, Fe 3 N and Fe 4 N phases with particle sizes ranging from 32 to 54 nm were formed. The results of polarisation corrosion tests showed that by applying duplex TRD and plasma nitriding, the corrosion resistance was improved.

show abstract

Section: Structural and Phase Analysismentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of plasma nitriding on nanostructure of TRD coating

Fesahat

Soltanieh

Eivani

2016

Surface Engineering

View full text Add to dashboard Cite

show abstract

“…In addition, compared to the direct-TRD process, the PN-TRD process exhibited porosity, as indicated with red arrows in Figure 5a-c, and a high coating speed. This can probably be attributed to the pores formed by the decomposition of the nitride serving as a diffusion path for Cr, thereby accelerating the formation of the coating layer [27][28][29]. Given the thickness of the composite layer, the optimum temperature of the TRD process is determined to be 950 • C. The PN-TRD specimen formed a coating layer of 3 μm at 800 °C, which thickened to 7 μm at 950 °C.…”

Section: Thermoreactive Deposited Layermentioning

confidence: 99%

Multilayer-Forming Behavior of Cr Nitrides and Carbides for Thermoreactive Deposition

Park

Kim²,

Kim³

et al. 2018

Metals

View full text Add to dashboard Cite

The effect of a nitride layer on the forming behavior of CrN and (Cr, Fe) 7 C 3 multilayers for thermoreactive deposition (TRD) was investigated. Plasma nitriding followed by TRD (PN-TRD) produced a larger coating thickness than the case of direct TRD with no plasma nitriding. For PN-TRD, an Fe 2-3 N layer of 10 µm in thickness was produced on AISI 52100 steels using plasma nitriding, followed by TRD using a mixed powder composed of 30 wt % Cr, 2 wt % NH 4 Cl, and 68 wt % Al 2 O 3 . During TRD at 800 • C, a CrN layer of 2 µm in thickness was formed along with a thin layer of mixed carbide (Cr 7 C 3 ) and nitride (CrN) on top. As the deposition temperature was increased to 950 • C, a new layer of Cr 7 C 3 was formed underneath the outermost layer composed of mixed Cr 7 C 3 and CrN. At 950 • C, a Cr-rich zone indicated a thickness of~7 µm. As the deposition time increased to 3 h at 950 • C, a new layer of (Cr, Fe) 7 C 3 was produced at the interface between the CrN formed at 800 • C and the base metal. This layer formed because of the abundant resources of Cr and C provided from the TRD powder and base metal, respectively. The multilayer and interface were concretely filled without the formation of voids as the TRD time increased to 6 h at 950 • C. The TRD process on a pre-nitrided layer was successfully applied to produce multilayers of CrN and Cr 7 C 3 .coating surface was deflected at the interface between the layers. However, PVD has the disadvantages of high cost and low adhesion compared to other coating technologies, such as CVD and TRD. CVD also has many process variables and a complicated device configuration. By contrast, TRD has the advantages of excellent bonding strength, simple equipment, and capability of mass production. TRD coating is performed in a heat treatment furnace at 800-1250 • C using carbonitride-forming powders, such as vanadium, niobium, tantalum, chromium, molybdenum, and tungsten. There are several process techniques incorporating salt baths, fluidized beds, and pack cementation [16]. In the surface treatment based on TRD, factors affecting the growth of the coating layer include temperature, time, powder composition, and base metal. The longer the time, the thicker the coating layer becomes, and the higher the temperature, the more the growth is promoted. The composition of the powder depends on the ratio of the mixed powders and the catalyst used [16][17][18][19][20][21]. To form a carbide, it is necessary for the base metal to contain at least 0.3 wt % C [18,22], and the carbide thickness becomes thicker as the C content increases [20,23]. Therefore, a multilayer having high hardness formed using TRD is more likely to be applied to the material that requires wear resistance, than that by PVD and CVD.In this study, we applied PN to increase the nitrogen content of the base material and a Cr-carbonitride multilayer with high hardness, corrosion, and wear resistance was formed on high-carbon steel through TRD coating [24,25]. In the TRD process, the integrity of the coating layer and ...

show abstract

“…On one hand, the mechanical properties of the nanostructured surface layer can be significantly improved [14][15][16][17][18][19][20]; on the other hand, re-modification surface treatment can be applied to the nanocrystallized surface layer, such as lower temperature nitriding, by which makes the rate of the diffusion elements into the surface layer increase greatly [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%