Effect of Microstructure on Shear Deformation in (α + γ) Duplex Stainless Steel

Abstract

Duplex stainless steel has excellent strength and corrosion resistance, and it is widely used such, for example, in plant applications. The microduplex structure affects not only the physical properties but also the deformation behavior. The fracture considered to be caused by the peeling duplex interface has been confirmed in various experiments and parts manufacturing factories, but there are few detailed references to the morphology of the microduplex structure. In this study, we examined the relationship between the morphology of the microduplex structure and the deformation behavior by the shearing test with load, horizontal or vertical to the stretching direction of the austenite phase. The latter load divided the duplex interface and delayed the fracture. The results showed that the microduplex structure acts as resistance to the load orthogonal to itself.

 

This Paper was Originally Published in Japanese in J. JSTP 63 (2022) 9–14.