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2017 | Buch

Plasma Nitriding of Steels

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This book focuses on the effect of plasma nitriding on the properties of steels. Parameters of different grades of steels are considered, such as structural and constructional steels, stainless steels and tools steels. The reader will find within the text an introduction to nitriding treatment, the basis of plasma and its roll in nitriding. The authors also address the advantages and disadvantages of plasma nitriding in comparison with other nitriding methods.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Introduction
Abstract
One of the most important applications of surface engineering is producing a hard layer on the surface of a tough material to improve, e.g., wear resistance. Therefore, different types of thermochemical treatments are used to obtain good surface properties. Among these methods, nitriding is extensively used in industry. The base of this method is diffusion of atomic nitrogen into the surface of steel while it is in ferritic state.
Hossein Aghajani, Sahand Behrangi
Chapter 2. Conventional DC Plasma Nitriding
Abstract
As known before, the usual source for generating the plasma in plasma nitriding system is DC current (conventional or pulsed). This chapter just includes the results obtained by conventional DC plasma nitriding system on different grades of steels including stainless steels (austenitic, martensitic or precipitation hardening types), tool steels, and structural and constructional steels. This chapter consists of microstructural, mechanical, and corrosion properties obtained after conventional DC plasma nitriding of steels.
Hossein Aghajani, Sahand Behrangi
Chapter 3. Pulsed DC Glow Discharge Plasma Nitriding
Abstract
Pulsed power supply is used for plasma nitriding to overcome the problems of conventional DC plasma nitriding. Therefore, using this power source has provided some noticeable advantages such as the following:
1.
A more accurate control on nitriding process
 
2.
Controlling and lowering the process temperature simply by adjusting the pulse width without any change in bias voltage
 
3.
Avoiding the arcing phenomenon on the surface of the workpiece
 
4.
A more uniform temperature distribution and lowering the overheating risk of the surface of the workpiece
 
Hossein Aghajani, Sahand Behrangi
Chapter 4. Active Screen Plasma Nitriding
Abstract
Conventional plasma nitriding has some limitations and disadvantages such as edge effect, hollow-cathode effect (The hollow-cathode effect usually seen in industry resulted by incorrect fixturing. This problem arises from insufficient distance between the parts to be nitrided. In this case, the glow discharge of near specimens are overlapped in cavities leads to the cascading of current densities and severe overheating of the parts.), distortion, and overheating of the specimen. Because of the above-mentioned problems, some new methods were presented to avoid the direct formation of plasma on the surface and consequent problems. One of the methods is active screen or cathodic cage plasma nitriding.
Hossein Aghajani, Sahand Behrangi
Chapter 5. Radiofrequency (RF) Plasma Nitriding
Abstract
The usual plasma nitriding is done using glow discharge with the workpiece as cathode at pressures between 100 and 1000 Pa. This procedure leads to bombardment of the surface by energetic ions, therefore the temperature is high.
Hossein Aghajani, Sahand Behrangi
Chapter 6. Other Methods
Abstract
In this section, some of the works related to other plasma nitriding methods are presented. These methods are not industrial yet and works are being done on them to optimize the working condition and efficiency.
Hossein Aghajani, Sahand Behrangi
Metadaten
Titel
Plasma Nitriding of Steels
verfasst von
Hossein Aghajani
Sahand Behrangi
Copyright-Jahr
2017
Electronic ISBN
978-3-319-43068-3
Print ISBN
978-3-319-43067-6
DOI
https://doi.org/10.1007/978-3-319-43068-3

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