Graduate Institute ofFerrous Technology



[ADL] Prof. Yoon-Uk Heo: Determination of Yield Stress in a Duplex Steel with a + c Lamellar Structure
GIFT 18-11-30 13:58

Yield stress ry is evaluated in a duplex steel with a + c lamellar structure by calculating the stress for the propagation of pile-up dislocations in one phase into another phase. Effective grain size of a lamella is determined to calculate the contribution of each boundary of a lamella to dislocation pile-up. Comparison of stresses required to drive a-to-c and c-to-a propagations of pile-up dislocations suggests that a + c lamellar structure yields by propagation of pile-up dislocations in a lamella to c lamella. ry of a + c lamellar structure is calculated as the sum of friction stress roa of a and the stress component Drc for yielding of c lamella at the effective grain size da,eff of a lamella. The calculated results explain better to the experimental ry than do results calculated using rule of mixture.


10.1007_s11661-018-4960-1.pdf 32회 (2.3M) 2018-11-30 13:58:35

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[CTL] Prof. Jung-Wook Cho: oxide metallurgy during AM

 In laser metal deposition (LMD) process, meltpool oxidation is inevitable due to high working temperature, which results in finely dispersed non-metallic inclusions in the steel matrix. In this paper, cha…

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