|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical and Creep Behavior of Advanced Materials: A SMD Symposium Honoring Prof. K. Linga Murty
||Cyclic Deformation Behavior of Modified 9Cr–1Mo Steel at Elevated Temperatures
||Vakil Singh, Preeti Verma
|On-Site Speaker (Planned)
Modified 9Cr–1Mo steel exhibited dynamic strain ageing (DSA) in the temperature range from 250 to 400 °C and it was established on the basis of plateau/peak in yield and tensile strength, minima in ductility, serrations in stress–strain curve and negative strain rate sensitivity. High density of dislocations and typical features like dislocation debris, kinks and bowing of dislocations were observed in the regime of DSA. This steel showed cyclic softening irrespective of strain amplitude, strain rate, and temperature. The observed cyclic softening was associated with cell formation at RT and annihilation of array of dislocations at 300 °C. In addition to coarsening of carbides at 600 °C there was dynamic recovery/recrystallization and also grain rotation. There was transition from equiaxed cell structure to elongated cell structure at strain amplitude of ±0.375% and corresponding change from non–Masing to Masing behavior at RT and 300 °C.
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