High Nitrogen Steels. High Nitrogen Containing Ni-free Austenitic Steels for Medical Applications.

Abstract

Nitrogen MetallurgyIn order to achieve the high nitrogen content aimed for it is possible to influence two factors which are described using Sievert's square root law (Fig. 2) Sievert's law and parameter for the calcu]ation of the nitrogen solubility at 1 600'C.

Significant Improvement in Mechanical Properties of Biomedical Co-Cr-Mo Alloys with Combination of N Addition and Cr-Enrichment

“…15) Moreover, the main substitutional solid solution element for both alloys is Cr which affects the solubility and mobility of interstitial solute elements such as C and N atoms; Cr strongly increases solubility of N in Fe-Cr systems. 13) With regard to Co, Blossey and Pehlke indicated that the solubility of N increased with increasing Cr content up to 3 mass% although the solubility is merely 0.0048 mass% in pure Co at 1600 C and 101325 Pa. 16) Thus, it is expected that the phase of the Co-Cr-Mo alloy is stabilized by the N addition and controlling the Cr content. A basic research conducted by Kliner et al has shown that considerable improvement in strength and ductility can be attained by adding N to Co-Cr-Mo alloys.…”

“…13,14) It is also expected that the stability of the phase would be enhanced by N addition of Co-Cr-Mo alloys, considering the similarity in crystal structure and lattice parameter between Fe-Cr and Co-Cr systems; both alloy systems have the fcc structure at high temperatures and similar lattice parameters of approximately 0.357 to 0.360 nm. 15) Moreover, the main substitutional solid solution element for both alloys is Cr which affects the solubility and mobility of interstitial solute elements such as C and N atoms; Cr strongly increases solubility of N in Fe-Cr systems.…”

Interaction between recrystallization and strain-induced precipitation in a high Nb- and N-bearing austenitic stainless steel: Influence of the interpass time

“…They have many industrial applications and represent a significant volume of the world production of metallic alloys. Among these steels are those with high content of nitrogen, which improves mechanical properties due to solid solution hardening [1,2]. Some advantages of high-nitrogen steels are: elevated yield stress; excellent combination of high resistance to the fracture and toughness; resistance to the formation of strain-induced martensite; low magnetic permeability, avoiding the formation of ferromagnetic phases; and good corrosion properties, improving pitting corrosion resistance [3].…”

The influence of the nitrogen/nickel‐ratio on the cyclic behavior of austenitic high strength steels with twinning‐induced plasticity and transformation‐induced plasticity effects

“…Austenitic stainless chromium-nickel-carbon (CrNiC) or chromium-nickel-molybdenum-carbon (CrNiMoC) steels are long known and applied for example in mechanical, process, automotive, and biomedical engineering [1][2][3]. The mechanical and chemical properties can be adjusted by further alloying elements like molybdenum and nitrogen as well as by cold-working [4,5].…”