Applied Process and other U.S. based thermal processing, surface treatment businesses will begin doing business as Aalberts surface technologies.
Continue readingOne Minute Mentor: Crevice Corrosion Testing
In crevice corrosion testing, treated 316 stainless steel compares favorably with alloy 625, as shown in the figure with three images. This figure shows three specimens at the end of a weeklong crevice corrosion test in natural seawater, at room temperature, under an applied potential of 300 mV.
Continue readingOne Minute Mentor: Low-Temperature Carburization of Stainless Steels
The combination of hardness and ductility achieved by low-temperature carburization also enhances resistance to erosion. The graph shows the results of cavitation testing of treated and nontreated 316 stainless steel specimens.
Continue readingOne Minute Mentor: Maps of Wear Resistance
The images show wear maps for (a) treated and (b) nontreated 316 stainless steel. The T316 stainless steel was treated by low-temperature carburization.
Continue readingOne Minute Mentor: Diffusivity of Nitrogen in Austenite
The diffusivity of nitrogen in ?N was determined from the stepwise denitriding kinetics of initially fully nitrided homogenous (stress-free) expanded austenite coupons.
Continue readingOne Minute Mentor: High-Temperature Nitriding for Deeper Case
High-temperature nitriding or solution nitriding at temperatures of 2010 ± 90°F is a new treatment available to produce cases with nitrogen concentrations in the range of 0.4 to 0.9 wt%, which is low compared to plasma nitriding treatments at low temperature (up to 16.9wt% N), but the resulting case is up to 100 times deeper (2 mm, or 0.08 in.).
Continue readingOne Minute Mentor: Plasma Nitriding
Plasma nitriding is a surface-hardening process in which glow-discharge technology introduces nascent (atomic) nitrogen into the surface of a metal part for subsequent inward diffusion
Continue readingOne Minute Mentor: The Passive Layer in Stainless Steels
The presence of chromium causes the buildup of a chromium oxide layer that is impermeable and adherent to the alloy substrate, protecting it from any further oxidation or corrosion.
Continue readingOne Minute Mentor: Heat Treating of Martensitic Stainless Steels
The effect of tempering temperature on hardness and tensile properties of high-alloy steels appears to have the same general form as those of low-alloy steel.
Continue readingChromium Nitride in Duplex Stainless Steels
Because of the use of nitrogen as an alloying element in these stainless steels, chromium nitrides (CrN) may be present on ?/? grain boundaries, on ?/? boundaries, and within the ? grains. If formed in large quantities and under conditions in which the chromium-depleted areas do not have time to repair themselves during annealing, the presence of CrN may adversely affect corrosion resistance.
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