ADVANTAGES OF GAS CARBURIZATION: 1) In gas carburization, the surface carbon content as well as the case depth can be accurately controlled. 3. The disadvantages of the process, the production of a compound white layer as well as a slightly uncontrolled case depth, are outweighed by the improved mechanical qualities delivered Flame hardening can be done of any shape, like flat, circular, irregular shapes, etc. Nitrogen is plentiful on Earth, however, in nature it exists as a two-atom molecule, chemically inert and too large to penetrate the surface. The flame could be directed to harden sections deep inside components. 24. Ion (Plasma) Nitriding Cons. As a technology for performing nitriding, gas nitriding offers several advantages. Tools and small components are often liquid-nitrided. January 2015; DOI: 10.1520/STP158020140081. Heat Treatment of Aluminum and Aluminum alloys; What is Heat treatment of metals? 9. It is faster than carburizing or nitriding etc. The difference between cyaniding and nitrogen case hardening (or carboni-triding) is that in the latter the diffusion of nitrogen and carbon is achieved from a gaseous medium. 2. (Photo credit: Advanced Heat Treat Corp). • It is much cleaner and more efficient method. Table 6.1 Comparison Chart of Some of the Commercially Available Custom Abutment Systems. 2. May lower the core hardness depending on the prior tempering temperature and With so little demand the process was more or less forgotten in the US. Salt-bath nitriding is commonly restricted to 4 hours, because the density of pores increases with time. There are advantages and disadvantages to both processes. The corrosive resistance of plasma nitriding compared with chroming is approximately the same, but with plasma nitriding are eliminated all other disadvantages of chroming, such as: brittleness, weak stroke resistance, encircling of curves, splitting, significantly smaller hardness etc. But what are other areas in which the two processes can be compared, and what are their differences? Nitrogen is plentiful on Earth, however, in nature it exists as a two-atom molecule, chemically inert and too large to penetrate the surface. Plasma nitriding: advantages and uses . However, times for gas nitriding can be quire long, that is, from 10 to 130 h depending on the application, and the case depths are relatively shallow, usually less than 0.5 mm. Tempering is a low temperature (below A1) heat treatment process normally performed after neutral hardening, double hardening, atmospheric carburising, carbonitriding or induction hardening in order to reach a desired hardness/toughness ratio. 2. Nitriding, process for hardening the surface of steel objects by introducing nitrogen (N) into it, where it combines with iron and other alloying elements to form hard metallic nitrides. Both processes increase surface hardness based on nitrogen diffusion into the product, increasing usable life span, wear resistance and/or fatigue strength, depending on the alloy. Tempering. This process can minimize wear and tear and increase the strength of the steel parts’ surface. 6.The Steel is tougher and stronger. The compound zone acts as a ceramic skin protecting the metal underneath from corrosion. 2.It increases wear-resistance of the metal. Limited on compound zone thickness (maximum) due to the nature of the process. Advantages and Disadvantages of Nitriding : 1. Advantages of case hardening nitriding process. Nitriding is a process of diffusing nitrogen atoms into the metal’s surface. The advantages and disadvantages of these techniques are similar to those of carburizing. Thank You. Based on those they are classified in to Solid nitriding Liquid nitriding Gaseous nitriding Some of the advantages of this process are 1) All the materials, which had undergone nitriding process, require no special heat treatment process. All Rights reserved. Gas nitriding is not restricted but normally a practically reasonable time of 90- 98 hours is not exceeded. posted 4.The case hardening normally makes steel easier to weld. 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