Microstructure Evolution and Mechanical Properties of Lean Duplex Stainless Steel Bars Prepared by a Short Process.

The effect of cold deformation and annealing temperature on the microstructure evolution and mechanical properties is shown in this research together with a unique short strategy for manufacturing lean duplex stainless steel bars. Furthermore, the effects of post-weld heat treatment (PWHT) and cooling treatments on the microstructure and mechanical properties of LDX 2101 bars are being investigated. The results demonstrate that the austenite produces a large number of deformation twins and strain-induced martensite (SIM) as cold deformation increases, and the SIM and austenite follow the traditional K–S and N–W orientation relationships. The best mechanical properties overall are achieved in LDX 2101 bars that have been annealed at 1020 °C. Moreover, short-time PWHT improves the austenite proportion in the heat-affected zone and weld metal, and PWHT can greatly enhance the overall mechanical properties of the welded joints. Additionally, the optimal heat treatment temperature of the welded joints is 1050–1080 ℃. Furthermore, compared to those treated with air cooling, the mechanical properties of the welded joints treated with water quenching following flash butt welding are superior. As a result, it is recommended that following flash butt welding, the welded joints are given a water-quenching treatment. [ABSTRACT FROM AUTHOR]