High-frequency electropulse deposition of microcrystallized MGH754 ODS alloy coatings

摘要

A simple but more efficient technique——high-frequency electropulse deposition——wasdeveloped to produce microcrystallized MGH754 ODS alloy coatings on the 1Cr18Ni9Ti stainless steel substrate. The coating has a very fine grain size of 30—300 nm and metallurgical bonding with the substrate. Isothermal oxidation in air at 1 000℃ for 100 h shows that micro-crystallisation and dispersed oxide particles promote the selective oxidation of Cr greatly to form a protective and continuous Cr2O3 scale and also improve the scale spallation resistance dramatically, thus increasing the oxidation resistance of 1Cr18Ni9Ti.