Abstract
Herein, powder metallurgy gas‐solid nitriding was used to prepare a high‐nitrogen Ni‐free austenitic stainless steel with more than 1.0 wt.% N. Study of the microstructures and corrosion resistances of the as‐prepared samples revealed that the corrosion weight loss, size, number of corrosion pits, and corrosion depth decreased as the N content increased from 1.19 to 1.37 wt.%. The self‐corrosion current densities of the alloys were determined from their potentiodynamic polarization curves. The changes in the capacitive arc radius as demonstrated by the Nyquist curves were consistent with the conclusions of the immersion corrosion analysis; that is, a high N content leads to a high corrosion resistance.
Highlights
Owing to its excellent comprehensive performance, high-N Nifree austenitic stainless steel (HNNS) has a wide range of applications, such as medicine, shipbuilding, petroleum, nuclear power, and automobile industries [1]
The content of Ni, which is more expensive than Mn and N, in SS304 (8–10.5%) is lower than that in SS316 (10–14%). us, the cost of HNNS is lower than that of Nicontaining stainless steel
Cr2N and CrN peaks were observed in the X-ray diffraction (XRD) pattern shown in Figure 2(b), suggesting that the precipitates in Figure 2(a) were Cr2N and CrN [28, 29]
Summary
Owing to its excellent comprehensive performance, high-N Nifree austenitic stainless steel (HNNS) has a wide range of applications, such as medicine, shipbuilding, petroleum, nuclear power, and automobile industries [1]. Compared with CrNi austenitic stainless steel, HNNS contains high Mn and N contents and an extremely low Ni content [2]. The content of Ni, which is more expensive than Mn and N, in SS304 (8–10.5%) is lower than that in SS316 (10–14%). Us, the cost of HNNS is lower than that of Nicontaining stainless steel. With N as the austenite phase-forming element of stainless steel, its addition can improve the mechanical properties and corrosion resistance of stainless steel. N can stabilize the austenite phase and significantly improve the mechanical properties and corrosion resistance of stainless steel [3, 4]. HNNS avoids potential problems related to Ni allergy [5,6,7]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
