Study on the Influence of Prior Cold Work on Precipitation Behavior of 304HCu Stainless Steel During Isothermal Aging
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The precipitation strengthening behavior of 304HCu austenitic stainless steel during isothermal aging at 650 °C is studied under 10 and 20 pct prior cold-worked conditions. The age hardening behavior under these cold-working conditions have been studied using hardness and electrical conductivity measurements. The analysis of electrical conductivity and hardness variation, during isothermal aging at 650 °C using the Johnson–Mehl–Avrami equation, indicates an increase in precipitation kinetics in the matrix, influenced by the dislocations formed during cold working. Further, XRD profiles of different cold-worked samples obtained from the INDUS-2 synchrotron are able to indicate the formation of very fine precipitates during thermal aging and these findings are corroborated with conductivity and hardness changes. The observed change in precipitation kinetics due to deformation is analyzed to evaluate an equivalent change in activation energy which is attributed to an equivalent of increase in aging temperature.
The authors thank Shri. A. Viswanath and Smt. T. Nivedha, Non-Destructive Evaluation Division (NDED), Metallurgy and Materials Group (MMG), IGCAR, for their help in preparing the samples. The authors express their gratitude to Dr. A. K. Sinha and Dr. Archana Sagdeo, Raja Ramanna Centre for Advanced Technology (RRCAT), Indore, for their involvement during the experiments at INDUS II synchrotron. The authors would also like to thank Dr. G. Amarendra, Director, MMG, IGCAR, and Dr. A. K. Bhaduri, Director, IGCAR, for their constant encouragement and support.
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