Mechanical properties of 75% Ar /25% CO_2 flux-cored arc welded E309L austenitic stainless steel

摘要

The austenitic stainless steel E309L filler is a commonly used material for in-situ crack repairs of hydro-turbines due to its high weldability, mechanical and chemical compatibility with the turbine's base material. However, experimental data for the as-welded E309L filler is scarce. In this paper, the mechanical properties of as-deposited 75% Ar/2596 CO_2 flux-cored arc welding E309L austenitic stainless steel are investigated. The material is shown to be rate- and temperature-sensitive. Furthermore, although the directional nature of the welding/repair process might suggests otherwise, the response is found to be isotropic. Finally, a classic three-dimension Johnson-Cook plasticity theory is implemented and reproduces the experimental results with good accuracy.