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신선가공 고탄소 강선에서의 시효현상과 딜라미네이션 발생간의 상관관계 고찰
이중원(J. W. Lee),이종철(J. C. Lee),강의구(U. G. Gang),이용신(Y. S. Lee),박경태(K. T. Park),남원종(W. J. Nam) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The effects of annealing temperature and time on mechanical properties and microstructures were already investigated in cold drawn pearlitic steel wires. During annealing, the increment of the tensile strength at low temperatures found to be due to age hardening, while the decrease in the tensile strength at high temperatures was attributed to age softening, involving the spheroidization of lamellar cementite and recovery of lamellar ferrite. Since Between increase of tensile strength and the occurrence of the delamination would be closely related to the dissolution of cementite, the increase of drawing strain by lower annealing temperature caused the between higher tensile strength and the easier occurrence of the delamination in cold drawn pearlitic steel wires.
초경량 Fe-27Mn-12Al-0.8C 이상조직강의 상온인장변형특성
하민철(M. C. Ha),황시우(S. W. Hwang),구진모(J. M. Koo),이재곤(J. G. Lee),박경태(K.-T. Park) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
Room temperature tensile deformation behavior of a low density Fe-27Mn-12Al-0.8C duplex steel was investigated to understand for plastic deformations with constituent phases. Various ordered phases were formed by quenching of the steel after annealing at the (austenite + ferrite) two phase region. The B2 domains were formed in disordered ferrite matrix. In addition to the B2 domains, fine D0 phases were evenly distributed through both B2 domains and disordered ferrite matrix. The nano-sized k-carbides were precipitated in austenite. The steel exhibited the relatively high yield strength and the low strain hardening rate initially, leading to the moderate elongation. Deformed structure of ferrite is manifested by short, straight segments of paired superdislocations. In austenite, a single planar dislocation glide was dominant at low strains and multiple planar slip occurred at high strains. Based on these microstructural observations, it is suggested that strain hardening of the steel is dominated mainly by shearing of the ordered phases by superdislocations (in ferrite) and planar gliding dislocation (in austenite).