The influence of thickness of CrN coating on the durability of hot forging dies

Smolik, J.

doi:10.2478/s13531-011-0021-x

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…Results presented in Figure 6 showed that dies covered with the hybrid layer NL + CrN are characterized by the best durability, compared to three other PVD coatings tested. The destruction mechanism of the forging dies covered with the hybrid layer NL + CrN [54,67,68], where the thickness of CrN coating was 4 microns, are presented schematically in Figure 7. A specially designed research die was used for this purpose, as shown in Figure 7a.…”

Section: Hybrid Layer Pn + Crnmentioning

confidence: 99%

Hard Protective Layers on Forging Dies—Development and Applications

Smolik

2021

Coatings

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The article presents a summary of many years of activities in the area of increasing the durability of forging dies. The results of comprehensive research work on the analysis of the destructive mechanisms of forging dies and the possibility of increasing their durability with the use of modern surface engineering methods are presented. Great possibilities in terms of shaping operational properties of forging dies by producing hybrid layers of the “Nitrided Layer + PVD Coating” (NL + PVD coating) type were confirmed. An analysis of changes in forging dies durability under various operating conditions was performed, i.e., forging—die—forging press—pressures. It has been shown that the variety of parameters of the forging process, including forgings’ geometry and weight, materials, precision, pressures applied, and, what is very important, quality of machines, makes it very difficult to compare the effectiveness of various PVD coating solutions in the process of increasing the durability of forging dies. Hybrid layers of the “NL + PVD coating” type create great possibilities in shaping the operational properties of tools and machine elements. However, in each application a precise diagnosis of the wear mechanism and the design of an individual PVD coating material solution is required.

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Section: Hybrid Layer Pn + Crnmentioning

confidence: 99%

Hard Protective Layers on Forging Dies—Development and Applications

Smolik

2021

Coatings

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“…Hot forming tools are often associated with low service life and high costs [ 1 , 2 ]. The commonly used methods to improve tool life, such as surface treatments and laser cladding, usually produce thin protective surface layers on the die surface [ 3 ]. The protective effects are limited, and the equipment is dimensionally limited, limiting the economic cost reduction.…”

Section: Introductionmentioning

confidence: 99%

Influence of Surfacing Fe-Based Alloy Layers on Wire Arc Additive Manufactured Ni-Based Superalloys Material on Its Microstructure and Wear Properties

Zhang

et al. 2022

Materials

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Wire arc additively manufactured (WAAM) Ni-based materials have good properties but are costly and hard to cut, leading to difficulties in machining after welding and wasting the materials. To overcome these shortcomings, this work proposes a method of surfacing Fe-based alloy layers on WAAM Ni-based material. The effect of this method on the microstructure and wear properties of WAAM Ni-based materials is discussed. In this work, a Fe-based alloy (JX103) was welded as the last layers of the WAAM Ni-based superalloy (JX201) material. The hardness, microstructure, and wear behavior of the material with different residual Fe-based materials were tested and analyzed. Our results indicate that the surface hardness was smoothly increased from HV350 to HV400 by overlaying Fe-based alloy layers. Microstructure analysis shows that γ-Fe gradually disappears, and the carbide form changes from WAAM Ni-based superalloys to Fe-based alloys. In the fusion boundary, the occurrence of cellular dendritic growth, a type -Ⅱ boundary, and low dilution indicate good crack resistance and good connection performance between these two materials. The wear test showed that the wear resistance of JX201 was decreased by changing the last layer to JX103. However, as the residual thickness of JX103 decreased, the influence gradually reduced. Meanwhile, the wear mechanism changed from severe abrasive and adhesive wear to light abrasive wear. When the thickness is less than 0.5 mm, the wear weight per minute is at the same level as the sample without JX103.

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