High Temperature Deformation Behavior of 25Cr5MoA Nitriding Steel

Abstract:

The high temperature deformation law of nitriding steel 25Cr5MoA over the strain rate range 0.001S^-1~20S^-1 and temperature range 850°C to 1150°C was studied in the thermal simulation testing machine Gleeble-1500. Under a certain strain rate and a certain deformation degree, the flow stress decreased with the increase of deformation temperature. Work hardening of nitriding steel 25Cr5MoA was strong when the true strain was less than 0.2, otherwise the flow stress increased slowly, even dropped. High temperature deformation flow stress of nitriding steel 25Cr5MoA was influenced by the deformation temperature and strain rate. When the strain rate was 0.1S^-1, true stress-true strain curve exhibited a dynamic recrystallization model, and with the increase of deformation temperature, peak flow stress shift left. When deformation degree was 0.69, the strain rate was 1S^-1, and when deformation temperature was in the region of 850°C~1050°C, true stress-true strain curve exhibited a dynamic recovery model. And when the deformation temperature was in the region of 1100°C~1150°C, it showed a dynamic recrystallization model. Dynamic recrystallization diagrams of nitriding steel 25Cr5MoA were also established.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 240-244
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.240
• Online since: November 2011
• Authors: Yue Zang, Shu Xia Li, Yi Kun Yang, Xue Ping Ren
• Keywords: 25Cr5MoA Nitriding Steel, Flow Stress, High Temperature Deformation

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