Microstructure, mechanical properties, and pitting corrosion resistance of SAF 2205 duplex stainless steel after friction hydro-pillar processing

Lessa, Cleber Rodrigo de Lima; Lemos, Guilherme Vieira Braga; Figueiredo, Arlan Pacheco; Martinazzi, Douglas; Cunha, Pedro Henrique Costa Pereira da; Reguly, Afonso; Mirzadeh, Hamed

doi:10.1007/s00170-022-08899-6

Cited by 3 publications

(1 citation statement)

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“…As explained above, it is widely reported the embrittlement effect of sigma and chi phases on the duplex microstructure. [4,14,16,36,37] Therefore, most of the international standards require amounts lower than 0.05% volume of sigma phase or even the total absence of this type of phases in the microstructure of these grades. With this main purpose, the last solution annealing and especially the later water quenching shall be performed to avoid the thermal profiles going through the curves of intermetallic phases precipitation.…”

Section: Discussionmentioning

confidence: 99%

Cooling Optimization of a Large Duplex Forged Bar and Subsequent Improvement in Impact Toughness over Its Thickness

Esteban¹,

Iglesias²,

Navarro³

et al. 2023

steel research int.

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The machining of a central axial hole in a duplex stainless steel 2205 bar is sufficient to optimize cooling and thus to achieve the toughness requirements of the most demanding international standards. The cooling rates are obtained by finite element methodology simulation. The increased cooling rate in the central zone of the bar is directly related to the improvement of the Charpy impact toughness. Microstructure at different bar locations is characterized by optical microscopy, scanning electron microscopy, and energy‐dispersive X‐ray spectrometry. In the absence of sigma phase precipitation, an austenite spacing over 45 μ provokes a decrease in absorbed energy close to 40 J. Moreover, the pierced bar complies with the international standards requirements in tensile with yield strength higher than 450 MPa and Rockwell hardness lower than 31 (HRC) over the section and along the bar. Finally, the resistance to pitting corrosion required is also satisfactory due to the absence of chromium nitrides.

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