New Manufacturing Process of Nickel-Free Austenitic Stainless Steel with Nitrogen Absorption Treatment

Abstract:

Ingots of ferritic stainless steels, Fe-24Cr and Fe-24Cr-2Mo in mass%, were worked to various dimensions for test specimens. Nitrogen was absorbed by the specimens in a furnace filled with nitrogen gas with a pressure of 101.3 kPa at 1473 K to develop a simple and convenient manufacturing process of nickel-free austenitic stainless steels. Ferritic Fe-24Cr and Fe-24Cr-2Mo were austenitized with nitrogen absorption to a 2-mm depth from the surface. The hardness, tensile strength, 0.2% proof stress, and elongation to fracture increased, and the reduction of area decreased in the alloys by austenitization due to nitrogen absorption. The tensile strength and 0.2% proof stress of these alloys with nitrogen absorption for 129.6 ks were much larger than those of 316L steel, while the elongation to fracture was much smaller than that of 316L steel. Therefore, small devices and parts with a maximum thickness or diameter of 4 mm were manufactured with this process in this study

• Periodical: Materials Science Forum (Volumes 449-452)
• Pages: 1085-1088
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.449-452.1085
• Online since: March 2004
• Authors: Daisuke Kuroda, Takao Hanawa, Takaaki Hibaru, Syuji Kuroda, Masaki Kobayashi, Takeshi Kobayashi
• Keywords: Manufacturing Process, Microstructure, Nickel-Free Austenitic Stainless Steel, Nitrogen Absorption, Tensile Properties

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200 400 600 800 1000 1200.

43. 2 86. 9 129. 6 Nitrogen Absorption Time ( ks) ǻ0. 2 (316L steel) ǻUTS (316L steel) (a) ǻUTS ǻ0. 2 Ultimate Tensile Strength, ǻUTS ( MPa) 0. 2% Proof Stress, ǻ0. 2 ( MPa).

200 400 600 800 1000 1200.

200 400 600 800 1000 1200.

43. 2 86. 9 129. 6 Nitrogen Absorption Time ( ks).

43. 2 86. 9 129. 6 Nitrogen Absorption Time ( ks) ǻ0. 2 (316L steel) ǻUTS (316L steel) (a) ǻUTS ǻ0. 2 Elongation to Fracture, El ( %) Reduction of Area, RA ( %).

43. 2 86. 9 129. 6 Nitrogen Absorption Time (ks) RA (316L steel) El (316L steel).

[10] [20] [30] [40] [50] [60] [70] [80] (b) El RA Elongation to Fracture, El ( %) Reduction of Area, RA ( %) Elongation to Fracture, El ( %) Reduction of Area, RA ( %).

43. 2 86. 9 129. 6 Nitrogen Absorption Time (ks).

43. 2 86. 9 129. 6 Nitrogen Absorption Time (ks) RA (316L steel) RA (316L steel) El (316L steel) El (316L steel).

DOI: 10.2514/6.2023-2035.vid

[10] [20] [30] [40] [50] [60] [70] [80] [0] [10] [20] [30] [40] [50] [60] [70] [80] (b) El RA 86. 4 86. 4 The Materials Science Forum.

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