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이원범(W. B. Lee),김경황(K. K. Kim),조균택(J. T. Joe),임경묵(K. M. Lim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
This study investigates the effect of cementite phase on surface hardening of carbon steels when the materials are shot-peened with balls with 250㎛ in diameter. Three carbon steels; 0.1%C(AISI1010), 0.45%C (AISI1045) carbon steel and 0.8%(eutectoid carbon steel) was used in this study. Results reveal that increment rate of surface hardness is dependent on carbon content. Grain at the surface transformed into grains with lamellar structure and highly dense dislocations are entangled at the neighboring grains. In case of eutectoid carbon steel, grain size at surface is refined up to 20~30㎚. Owing to severe plastic deformation at the surface of carbon steels, ferrite grain size is refined and spheroidization of cementite is observed. We can deduce that a primary reason for significant surface hardening of carbon steels might be attributed to surface grain size refinement and ferrite solution increase of carbon following cementite dissolution.