Effect of dual-phase structure on the microstructure and deformation inhomogeneity of 2507 duplex stainless steel

ABSTRACT

In this work, the microstructure and deformation mechanism, based on uniaxial tensile tests of 2507 super duplex stainless steel, is investigated using OM, XRD, EBSD, TEM and micro-Vickers. The experimental results indicate that the as-received sheet is not sensitive to strain rate at room temperature. The ferrite phase is softer than austenite phase during the tensile deformation process. In the initial stage of deformation, the strain is mainly accommodated in the ferrite phase. As the deformation increases, the strain continuously transmits to the austenite phase and the two phases coordinately deform. The strain is unevenly distributed in the two phases, and the strain is concentrated at the phase boundary.

KEYWORDS:

• Super duplex stainless steel
• tensile behaviour
• microhardness
• deformation heterogeneity
• strain partitioning
• microstructure
• EBSD
• TEM

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research is finally supported by the National Natural Science Foundation of China (Grant No. U1806220) and the Science and Technology Major Project of Shanxi Province (Grant No.20191102006).