Unified Tensile Work Hardening Behaviour of Thin Section Plate and Forged Thick Section 9Cr-1Mo Ferritic Steel

作者：Choudhary B K^*; Samuel E Isaac; Palaparti D P Rao; Christopher J; Mathew M D

来源：High Temperature Materials and Processes, 2013, 32(3): 287-294.

DOI：10.1515/htmp-2012-0110

• 9Cr-1Mo steel
• tubeplate forging
• unified tensile work hardening
• work hardening rate
• plastic strain rate

Detailed investigation has been performed on tensile work hardening behaviour in terms of the variations of instantaneous work hardening rate (theta = d sigma/d epsilon(p), where sigma is true stress and epsilon(p) is true plastic strain) with stress and true plastic strain rate ((epsilon) over dot(p)) for temperature range 300-873 K in two different material conditions, (i) normalised and tempered plate and (ii) quenched and tempered tubeplate forging of 9Cr-1Mo ferritic steel. Both plate and tubeplate forging exhibited two-stage work hardening and three different temperature regimes in the variation of theta with sigma. The variations of theta with respect to (epsilon) over dot(p) exhibited unified work hardening in terms of a single master curve independent of temperature and initial microstructure. theta varied linearly with reciprocal of plastic strain rate, i. e. 1/(epsilon) over dot(p), and as a consequence, linear correlation between the rate of change of true stress and true plastic strain rate independent of temperature and microstructure has been obtained.

• 出版日期2013-6