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Plasma nitriding, also called ion- or glow-discharge nitriding, is an advanced surface-engineering technique that allows for treatment of many different engineering components made of ferrous and titanium alloys.
Whether with advanced high-strength steel (AHSS) or mild steel, many automotive parts need to be stamped. Dies for stamping those parts need to be optimized, and that drives the need for surface treatments.
The application of ion/plasma nitriding to powder-metal (PM) products is recommended over the gas nitriding method. Ion/plasma nitriding results in surface hardening while gas nitriding causes unintended through-nitriding, making the treatment not suitable for a majority of engineering components made of PM.
The importance of early-stage design decisions for enhancing surface properties of steel and cast-iron components with nitriding and nitrocarburizing cannot be overstated.
The need for lighter and safer vehicles increases the demand for stronger steels in automotive bodies. Aerospace components have many of the same demands but on a more rigidly controlled level with a wider variety of materials.
Heating of loads in modern plasma nitriding furnaces is carried out by a combination of the radiative heat transfer from the wall or furnace resistance heaters and heat transfer from the glow discharge. We will look at the effect of the workpiece emittance on its temperature.
Wear, corrosion and fatigue properties are
strongly dependent on surface quality and its modifications. Thermochemical
methods such as gas and plasma nitriding allow for enhancement of these
properties in most severely loaded (mechanically and/or chemically) applications
without causing any changes in dimensions of the treated objects.