High Nitrogen Steels. Effect of Nitride (Cr2N) Precipitation on the Mechanical, Corrosion, and Wear Properties of Austenitic Stainless Steel.

Abstract

USA.High-nitrogen austenitic stainless steels are thermally unstable and susceptible to nitride precipitation (primarily

Microstructural evolution and mechanical properties of aging high nitrogen austenitic stainless steels

“…The fraction of intergranular brittle fracture increases with the increase of aging temperature and time, and is consistent with the CVN impact absorbed energy values, which is in agreement with the result in Ref. [24]. The leading brittle intergranular fracture at room temperature can be attributed to more precipitates along grain boundaries and the cellular precipitates.…”

Chromium Nitride Precipitation Behavior in Weld Heat-affected Zone of High Nitrogen Stainless Steel.

“…No significant precipitation occurred at the heat-affected zone (HAZ). Timetemperature-precipitation (TTP) curves of 18%Cr-18% Mn-0.6ϳ1.2%N steels, 3) 18%Cr-18%Mn-2%Mo-0.9%N steel, 4) 19%Cr-5%Mn-5%Ni-0.7%N steel 5) and 21%Cr-25 %Mo-0.9%N 6) steel showed that it took over 10 s to precipitate chromium nitride, so it was estimated that precipitation would not occur within heat cycle of the conventional arc welding.…”

Modelling of Cr2N Age-precipitation in High Nitrogen Stainless Steels by Neural Networks

“…Containing more nitrogen than it can be retained through processing at usual pressure; high-nitrogen steels become more corrosion resistant and acquire better yield properties. 1) Nitrogen as an interstitial solid-solution strengthener is known to be an austenite stabilizer having higher solid-solubility than that of carbon. 1,2) Thermal stability, nitride precipitation kinetics, and the effects of nitride formation on mechanical properties and corrosion resistance are thoroughly studied by Simmons. 3) Generally, high-nitrogen steels have two main limitations.…”

“…1) Nitrogen as an interstitial solid-solution strengthener is known to be an austenite stabilizer having higher solid-solubility than that of carbon. 1,2) Thermal stability, nitride precipitation kinetics, and the effects of nitride formation on mechanical properties and corrosion resistance are thoroughly studied by Simmons. 3) Generally, high-nitrogen steels have two main limitations. First is connected to their production: nitrogen is poorly soluble in liquid iron-based alloys at atmospheric pressure.…”