The Characteristics of Strain Induced Transformation in Medium Carbon Steels

by "C. Chien, Y. T. Wang, C. Y. Huang"

Publisher - China Steel Corporation, Kaohsiung, Taiwan R.O.C.

Category - Engineering & IT

"In this study, the strain effects on the phase transformation and hardness of medium carbon steels (S50C) was investigated by using computer-aided steel simulation and the dilatometer. It has been well known that the deformation on austenite around Ar3 temperature has profound influences on the microstructure and the phase transformation evolution of the medium carbon steel. Therefore, the effects of different strain levels and deformed at different temperatures were discussed in this study. The microstructure as well as the hardness of the S50C steels were observed by OM/SEM and measured by Rockwell hardness test, respectively. It was found that as the strain energy increases, the volume fraction of ferrite and pearlite which replaces martensite, especially the ferrite phase, will increases resulting in the hardness of S50C steel decreases significantly. The degree of grain refinement also elevates since the nucleation sites increase. When the applied energy is high enough, the pearlite colonies are broken into fragments, and the hardness drops further."

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