Examination of Plain Carbon Steels Using an Atomic Force Microscope
Atomic force microscope (AFM) examination was performed on plain carbon steels. A 1018 steel that was austenized and furnace cooled revealed raised grain boundaries when etched with nital. It was concluded that these grain boundaries consist of walls of cementite formed during cooling below the eutectoid temperature. Examination using the AFM was done on 1045 and 1095 steels that had been water quenched after austenizing. Lath martensite and also martensite platelets were etched less than bainite using nital. These structures were seen more clearly than with optical microscopy.
KeywordsAtomic Force Microscope Gamma Alumina Differential Interference Contrast Water Quench Lath Martensite
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