The selection of laser beam diameter in directed energy deposition of austenitic stainless steel: A comprehensive assessment

Kong, Yu Sik; Zhao, Lunwu; Zhu, Lingkai; Huang, Haihong

doi:10.1016/j.addma.2022.102646

Cited by 2 publications

(2 citation statements)

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“…The solution annealing improves the corrosion resistance but does not provide a sufficient driving force for dissolving the secondary phase and increasing the volume fraction of ferrite [4,19]. Therefore, when the secondary phase is precipitated, the volume fraction of ferrite must be increased to prevent the decrease in the corrosion resistance; when precipitating 30% of the secondary phase, the heat treatment at a high temperature of up to 1200 • C results in equivalent fractions of austenite and ferrite [5,26,27]. The studies of Y. Kong and M. Li show grain growth to higher heat input energy of stainless steels [26,27].…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, when the secondary phase is precipitated, the volume fraction of ferrite must be increased to prevent the decrease in the corrosion resistance; when precipitating 30% of the secondary phase, the heat treatment at a high temperature of up to 1200 • C results in equivalent fractions of austenite and ferrite [5,26,27]. The studies of Y. Kong and M. Li show grain growth to higher heat input energy of stainless steels [26,27]. When the cooling rate is equal, the grain growth is easy because of enough energy and time.…”

Section: Discussionmentioning

confidence: 99%

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Effects of the Volume Fraction of the Secondary Phase after Solution Annealing on Electrochemical Properties of Super Duplex Stainless Steel UNS S32750

Kim

Chung

Shin

2023

Metals

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Super duplex stainless steel (SDSS) is used for manufacturing large valves and pipes in offshore plants because of its excellent strength and corrosion resistance. Large valves and pipes are manufactured by forging after casting, and the outside and inside microstructures are different owing to the difference in the cooling rate caused by the thermal conductivity. This microstructural variation causes cracks during solution annealing, which breaks the materials. To study the corrosion resistance of the SDSS forged material, the influence of the microstructure according to the difference between the inside and outside cooling rates of the cast SDSS was evaluated. To analyze the effects of the secondary phase fraction before solution annealing on the solution and corrosion resistance, the corrosion resistance with and without solution annealing was measured using the potentiodynamic polarization test and critical temperature test after the precipitation of the secondary phase. In the potentiodynamic polarization test, the secondary phase decreased the activation polarization and increased the corrosion rate. The critical pitting temperature exhibited the effect of the secondary phase.

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