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- W2618719015 abstract "Dynamic strain aging (DSA) affects mechanical properties of the materials and promotes strain localisation. DSA results in serrated plastic flow, which was observed by means of constant extension rate tensile (CERT) tests in commercial AISI 316NG austenitic stainless steel and Inconel 600 and Inconel 690 Ni-base alloys at temperature range of 200 – 600 C and values of strain rate from 10 to 10 s. Negative strain rate sensitivity, which is another manifestation of DSA, was also reported for the studied materials at temperatures and strain rates where serrated plastic flow appeared. The map for occurrence of serrated flow as a function of strain rate and temperature was built for these materials. The activation enthalpies of dynamic strain aging appearance were found to be 120 kJ/mol for the austenitic stainless steel and 159 kJ/mol for both Ni-base alloys. The internal friction (IF) peak associated with the interstitial atoms of nitrogen and carbon in the solid solution of AISI 316NG austenitic stainless steel and Inconel 600 alloy was reported. The enthalpies of nitrogen diffusion in AISI 316NG steel (140 kJ/mol) and carbon diffusion in Inconel 600 alloy (162 kJ/mol), obtained by means of internal friction, correspond well to the enthalpies of DSA appearance. The height of the internal friction peak increases depending on the pre-straining conditions in the similar way for AISI 316NG steel and Inconel 600 alloy. Annealing in situ at the IF peak temperature results in the decay of the IF peak enhanced by pre-straining for both materials. At the initial stage, the peak annealing processes can be described as an elemental exponential decay function with characteristic times of 0.95 and 0.92 ks for AISI 316NG steel and Inconel 600 alloy, respectively. Transmission electron microscopy was performed on the specimens of AISI 316NG steel after CERT tests at temperatures of 400 and 200 C, where serrated and smooth plastic flow was observed, respectively. Long-range planarity was observed in the dislocation structures of the specimen tested at 400 °C. The microstructure of the specimen strained at 200°C exhibited cellular dislocation structure. It was concluded, that diffusion re-distribution of nitrogen in the DSA regime affected the deformation behaviour of the material by restricting cross-slip, which in turn promotes strain localization, degrading the mechanical performance of the material." @default.
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- W2618719015 date "2009-01-01" @default.
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- W2618719015 title "Manifestations of DSA in austenitic stainless steels and inconel alloys (1-2013)" @default.
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