Gas nitriding is a thermochemical case-hardening process that increases wear resistance, surface hardness and fatigue life by dissolution of nitrogen and hard nitride precipitations.
Nitrided stainless steel gear teeth present special concern due to their inherent brittleness and loss of corrosion resistance. This presentation will review all aspects of nitrided gear teeth, from the point of manufacture, through process and post-process parameters, to the final product and different failure modes.
To fulfill exacting specifications, gas nitriding technology relies on the ability to control, regulate the atmosphere, while keeping in mind the behaviour and the kinetics of the process.
|Need Support?||The surface and section morphology of coatings were observed using scanning electron microscopy. The phase composition of coatings was analyzed by X-ray diffraction.|
This presentation will address the topic of uniformity of white layer growth, nucleation, roughness and factors affecting uniformity and case depth.
Activation of Surfaces Prior to Gaseous Nitriding of a 3wt. Pre-treatments are compared based on their efficiency on uncleaned samples, defined by the different degrees of residues of water dissolved machining oil, to be nitrided. Findings in the first few hours of nitriding are reported on a 3wt.
In recent years, there has been a trend to limit or eliminate the use of toxic chemicals in manufacturing processes. As far as gas nitriding of stainless steels for complex automotive components, there is pressure to eliminate chlorine-based chemicals and acids often used to depassivate surfaces.
This presentation will show results obtained on different stainless steels and components using alternative depassivation methods.
The simulated results are compared with experimental hardness profiles of tempered and subsequently gas nitrided SCM low alloyed steel.
This is particularly true when nitriding alloyed steels to aerospace and automotive specifications that require quench and temper of the material prior to nitriding. In this presentation, we discuss the different approaches and give a comparison of the calculation results for a set of chemical compositions.
This presentation will introduce Active Screen Plasma Nitriding ASPN technology, a new technology to North America, that reduces consumption of ammonia to zero and uses 10 times less gas.
ASPN also removes all problematic issues that Direct Current Plasma Nitriding faces, but retains the possibility of nitriding without a white layer and nitriding at a lower temperature.
Differences In Plasma Nitriding Technology, New Developments from Ion Heat by Ion Heat Plasma nitriding technology is less well understood in North America, due in part to cold-wall DC current plasma nitriders, whose poor metallurgical flexibility and technological drawbacks have hindered its development.
Ion Heat has developed a hot-wall, pulsed DC plasma technology that has solved these issues. This presentation will describe the differences in operation and will compare results obtained by different plasma nitriding technologies and by Ion Heat.
This presentation will examine solutions made up of control equipment and sensor technology upgrades that address process and specification requirements. This is the case for crankshafts, camshafts and driveshafts among others. Thermochemical treatments on radial symmetry surfaces makes it relevant to employ different approaches to improve end results.
A mathematical model that describes the compact layer growth kinetics during plasma nitriding of a pure iron solid cylinder will be presented.
The model is able to simulate up to three-stage recipes, with varying temperatures and nitriding potentials, while also taking into account nucleation time. Contamination on the part surface can lead to production loss or scrapping of a part or of the whole lot.
The focus of this presentation is VAIOCS-technology, the different cleaning modules available for organic and in-organic contaminants, and how this technology is used in pre- and post-nitriding operations.
Several applications where ferritic nitrocarburizing is used to provide a highly customized case configuration will also be presented.Nitrocarburizing of Austenitic Stainless Steel Steels.
and o xidation r esistance at high temperature, stainless steels are. “Nitriding of A ISI 3 16L. Low Temperature Carburizing of Austenitic Stainless Steel: Part One Low-Temperature acetylene based carburization and nitrocarburizing of L austenitic stainless steel, PhD thesis, Case Western Reserve University, August Date Published: Jan This entry was posted in Corrosion, High and low temperatures, Stainless Steel and.
Ferritic nitrocarburizing (FNC) can be performed in the same chamber also with different temperatures and different gas mixes. Typical load sizes are from 36” to 60” diameter by 90” tall. Insulations used in the hot zone are fiber.
Heating elements are traditionally rod overbend style that are electrically isolated from the steel casing. Environmentally-Friendly Depassivation and Nitriding of Stainless Steels by Nitrex Metal Inc. Treatment time was 2 hours and performed at 3 different temperatures – °C, °C, and °C.
Results were compared against untreated L stainless steel, High Nitrogen Steel (HNS), and a sample nitrided for 10 hours. Surfaces nitrided. According to conducted thermodynamic calculations stainless steels of high Cr and low Ni content may require a nitrogen pressure of less than 1 bar, steels of lower alloy content demand a nitrogen pressure of up to 3 bar in a temperature range between C and C.
During plasma nitriding, in a vacuum at a temperature between °C and °C, in the presence of nitrogen and electric field, a plasma of accelerated atoms develops which collide against steel surface at a very high speed. A hard compound layer of nitrides is .