The compression behavior of a ferritic-martensitic Cr-Mo steel is characterized for strain rates ranging from 10-4 s-1 to 10-1 s-1 and engineering strains up to 40%. Adiabatic heating causes a reduction in flow stress during continuous compression at a strain rate of 10-1 s-1. No reduction in the flow stress is observed if interrupted compression tests are performed with loading and holding steps. Two work-hardening stages with work-hardening rates decreasing linearly with the flow stress are identified and interpreted in terms of the KocksMecking model. The microstructural evolution is governed by storage of dislocations leading to formation of fine subgrains within martensitic laths.
Risoe International Symposium on Materials Science. Proceedings, 2012, Vol 33, p. 423-430
Lette stærke materialer til energiformål
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33rd Risø International Symposium on Materials Science, 2012