Precipitation mechanism of σ phase in S32654 super austenitic stainless steel

Article Materials Science, Multidisciplinary

Impact of boron addition on the hot deformation behavior and microstructure evolution of S31254

Shuai Li et al.

Summary: This study investigates the microstructure changing of B modified as-cast S31254 super austenitic stainless steels before and after hot compression test at 950 degrees C and a fixed strain rate of 0.01 s(-1). It is found that S31254 with B exhibits enhanced thermoplasticity during the test and also restrains the generation and propagation of cracks. The presence of B prevents the precipitation of a phases and promotes their recrystallization during hot deformation. The segregation of B atoms at the austenite grain boundary influences the microstructure and thermoplasticity properties, and accelerates the inhibition function during the nucleation of a phase.

MATERIALS LETTERS (2022)

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Review Engineering, Mechanical

Non-destructive techniques for the detection of sigma phase in duplex stainless steel: A comprehensive review

M. Biezma et al.

Summary: Sigma phase, a deleterious phase in duplex stainless steels, can decrease mechanical properties and corrosion resistance. Non-destructive techniques (NDT) such as ultrasound and magnetic methods are commonly used for detection, with other alternatives like electrochemical potentiokinetic reactivation (EPR) and replication metallography (RM) analysis. The trend for NDT applied to sigma phase, mechanisms influencing its formation, and consequences on DSSs are thoroughly discussed in this review.

ENGINEERING FAILURE ANALYSIS (2021)

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Article Materials Science, Multidisciplinary