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Sai Srikanth Gvk,M. J. Tan,Zhenyun Liu 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
This study investigates the eff ect of strain rate (SR) on the strain rate sensitivity (SRS), strain rate work hardening (SRWH)in Co–35Ni–20Cr–10Mo alloy (MP35N) wires, subjected to drawing practices namely full die drawing (FDD) and half diedrawing (HDD). The experimental results illustrate that the strength, and SRWH, of the drawn wires, increased with therise of SR, whereas the SRS(m) and the ductility decreased with the increase of strain rate (10 −6 s −1 to 10 −2 s −1 ). However,the relative strength, hardening, and the m values were observed to be higher in the FDD drawn wire when compared to theHDD drawn wire. The increase in strength and hardening rate of the FDD drawn wire with the rise in SR was ascribed toincreased dislocation density and reduced twin thickness, and the increased SRS and ductility at low SR were attributed tothe increased grain boundary (GB) activities. The HDD drawn wire had a relatively lower strength, SRWH and SRS rate at anSR of 10 −6 s −1 when compared to other SR, this was attributed to plastic fl ow localization, which led to the formation of shearbands in the material. An abnormal SRWH was observed in the HDD drawn wire tested to an SR of 10 −2 s −1 , where a StageII hardening peak was observed at a very high strain, this was attributed to the solute segregation of the Mo atoms to the GB.