To adapt porous material for its application as low noise trailing edge, a special rolling process, using time-varied gap, was used in previous research to produce porosity gradient the direction of rolling. Investigations suggest that may also be produced thickness material, i.e., gap direction, without specialized mill. Such help further increase acoustic efficiency materials. The aim this st...

in this study, the four cr-mn-(ni-free) austenitic steels were fabricated by vacuum induction furnace. then plates with 10 mm thickness were fabricated by hot-rolling. corrosion behaviour of the four cr-mn steels in 0.1 m h2so4 solution was investigated using by open-circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy (eis). the results indicated that the...