Abstract
The effect of friction stir welding on microstructure and corrosion property was studied in Fe-30Mn-3Al-3Si (wt.%) twinning-induced plasticity steel using both an electron backscattered diffractometer and electrochemical testing (i.e., polarization test and electrochemical impedance spectroscope). The stir zone has a relatively higher corrosion resistance with uniform dissolution on the surface despite after welding, whereas the base metal shows localized corrosion attack with deep and long degradation along the grain boundaries. This is due to the corrosion-resistant coincidence site lattice boundaries caused by discontinuous dynamic recrystallization via the grain boundary bulging during the friction stir welding.
Highlights
For several decades, modern industries have focused on Fe-high Mn twinning-induced plasticity (TWIP) steels due to their outstanding combination of strength and ductility (>50,000 MPa%)
To examine the change in the microstructure of the C free TWIP steel before and after friction stir welding (FSW), the electron backscattered diffractometer (EBSD) observation was conducted along a normal direction (Figure 1)
2.780 mils per year, whereas the Icorr value of the stir zone is 5.350 μA cm−2 and its corrosion rate is on the polarization results, it is clear that the stir zone of C-free TWIP steel after FSW has a relatively
Summary
Modern industries have focused on Fe-high Mn twinning-induced plasticity (TWIP) steels due to their outstanding combination of strength and ductility (>50,000 MPa%). For the weldability of Fe-18Mn-0.6C-(0, 1.5)Al (wt.%) TWIP steels, friction stir welding (FSW) can suppress the degradation of mechanical properties in weldment, because of both grain refinement by dynamic recrystallization and active twinning by optimal twinning stress [6]. The grain refinement of Fe-13Mn-0.5C-1.6Al (wt.%) TWIP steel after FSW results from two types of discontinuous- and continuous-dynamic recrystallization [9]. Metals 2020, 10, 1557 and Fe-30Mn-3Al-3Si (wt.%) TWIP steels after FSW show an increase in the value of stacking-fault energy This is because of an increase in non-chemical Gibbs free energies, such as shear strain energy, by accumulated dislocations and excess free energy by grain refinement, leading to a change in the twinning stress [7]. To elucidate the relationship between the corrosion behavior and microstructure, the microstructural evolution in the FSW joint was characterized using an electron backscattered diffractometer (EBSD)
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