DOWNLOAD : Nitriding Symposium 4 Technical Program

Practical Gas Nitriding of Aerospace Gears by Continental Heat Treating Inc.
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.

Elements of Uniformity and Reproducibility of Controlled Gas Nitriding by Nitrex Metal Inc.
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. 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.% Cr Carbon Iron-based Alloy by MSMP Laboratory, Arts et Métiers ParisTech
The present work deals with three in-situ surface activation solutions prior to nitriding that are oxidation, urea and ammonium chloride. 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.%Cr carbon iron-base alloy.

Environmentally-Friendly Depassivation and Nitriding of Stainless Steels by Nitrex Metal Inc.
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.

Prediction of the Hardness Profile of Tempered & Gas Nitrided Low Alloyed Steel by YuJin SMC Co., Ltd
This work analyzes tempering and nitriding behavior of low alloyed steel in conjunction with proper empirical strength formula to predict the hardness profile. The simulated results are compared with experimental hardness profiles of tempered and subsequently gas nitrided SCM440 low alloyed steel.

How to Determine Pre-nitriding Properties Based on Hardenability and Tempering Conditions – a Comparison of the Most Popular Approaches by Process-Electronic GmbH, a member of UPC
Predicting core strength is one of the most important tasks when calculating the effective case depth achieved in nitriding. 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.

Electrochemical Behaviour in SBF of 316l Stainless Steel Thermochemically Treated By Ion Nitriding by Ion Heat
In this talk, we present findings of 316L austenitic stainless steel substrates treated by ion nitriding. Treatment time was 2 hours and performed at 3 different temperatures – 380°C, 400°C, and 420°C. Results were compared against untreated 316L stainless steel, High Nitrogen Steel (HNS), and a sample nitrided for 10 hours. Surfaces nitrided for 2 hrs at 380°C and 400°C exhibited thicker and more stable passive layers, and the highest Rm values (improved corrosion resistance).

North American Introduction to Active Screen Plasma Nitriding (ASPN) by ALD Vacuum Systems Inc.
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.

Solution-Oriented Approach to Nitriding / Nitrocarburizing Controls by United Process Controls Inc.
For equipment operating in the ‘wear-out’ phase, the application of new control and sensor technology can push back equipment into useful life. This presentation will examine solutions made up of control equipment and sensor technology upgrades that address process and specification requirements.

Mathematical Modeling & Simulation of the Compound Layer Growth Kinetics in Cylindrical Surfaces during Plasma Nitriding of Pure Iron by ITESM
Radial symmetry plays a fundamental role in tribological systems, where spinning on axes takes place. 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.

Simulation of Nitriding / Nitrocarburizing Process by Process-Electronic Gmbh, a member of UPC
In this talk, we present a new approach where thermodynamic and kinetic effects are calculated based on material composition and pre-nitride condition. The model is able to simulate up to three-stage recipes, with varying temperatures and nitriding potentials, while also taking into account nucleation time.

Parts Cleaning Before & After Nitriding as a Value Added Process Step by EMO/CIS
Nitriding places high demands on the degree of cleanliness of the parts to be treated. 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.

Versatility and Technological Possibilities of Controlled Ferritic Nitrocarburizing by Nitrex Metal Inc.
Today’s ferritic nitrocarburizing offers the possibility of choosing the amount of porosity of a white layer, the content of ε/γ’, and a perfect case configuration for applications that involve either high point loading, high corrosion resistance or sliding wear. In this presentation, we discuss the influence of separate elements of process control, including nitriding potential, then the influence of various carbon carrier gases, and the possibilities of Kn/Kc control. Several applications where ferritic nitrocarburizing is used to provide a highly customized case configuration will also be presented.