Fabrication of Fine-grained High Nitrogen Austenitic Steels through Mechanical Alloying Treatment.

Texture and Planar Anisotropy in Lean Duplex Stainless Steel Sheet

“…There are some observations of strengthening by various types of interstitial or substitutional elements, and the increase of N content in solid solution in the γ phase leads it to harden effectively. [44][45][46][47] Although the type of elements and their quantities in solid solution differ between Type 32101 and Type 329J4L, N content may be the reason why the γ phase in Type 32101 was harder than the α phase and γ phase in Type 329J4L. On the other hand, α phase in Type 329J4L contains a lot of Ni and Mo, it is guessed that the α phase is harder than that in Type 32101.…”

Solution Nitriding Treatment of Fe-Cr Alloys under Pressurized Nitrogen Gas

“…6, the experimentally measured N content does not wholly agree with the theoretical one calculated by Eq. (7). In past studies, the difference from Sievert's law in high N alloys was considered to be caused by the interaction between solute N atoms.…”

“…However, since nickel in those materials, such as in SUS304 and SUS316 stainless steels, is considered to cause allergies, many researchers are recently interested in the development of Nifree austenitic stainless steels. [1][2][3][4][5][6][7] Like nickel, nitrogen is a strong austenite stabilizer. The effect of the addition of N to iron and steel has been investigated in order to improve the material properties.…”

“…The introduction of N in steels can be performed by high-pressurized nitrogen electro-slag remelting (ESR) method, 2,3) nitrogen absorption treatment [4][5][6] and mechanical alloying (MA) treatment. 7) Nitrogen absorption treatment, in other words, the solution nitriding (SN) treatment we used in the present study is solidsolution treatment under N 2 atmosphere for the steel surface or the entire steel. The advantage of SN treatment as compared with other methods is the secondary process after the mechanical work of the ferritic Fe-Cr based alloys, which have lower work hardening and better formability than the austenitic alloys with N. However, since SN treatment requires a long time for the diffusion of N into steels, it is difficult to apply to a practical steel-making process at the present time.…”

Reverse Austenite Transformation Behavior of Equal Channel Angular Pressed Low Carbon Ferrite/Pearlite Steel

“…Meanwhile, with the recent advent of breakthrough technologies refining the grain size of metallic materials down to the submicrometer level, innumerous researches have been carried out to develop ultrafine grained (UFG) steels, [2][3][4] mainly focusing on enhancing their mechanical properties. The reverse transformation characteristics of UFG steels are expected to quite differ from those of coarse grained steels since the former contains a higher density of lattice defects that can affect the transformation kinetics than the latter.…”