caa a22 4500 463229339 CHVBK 20180405153237.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10853-006-1273-3 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1273-3 Acoustic emission during tensile deformation of pre-strained nuclear grade AISI type 304 stainless steel in the unnotched and notched conditions [Elektronische Daten] [Chandan Mukhopadhyay, Tamanna Jayakumar, Baldev Raj, Kalyan Ray] Acoustic emission (AE) generated during tensile deformation of notched specimens with varying notch lengths has been compared with those from unnotched specimens of a nuclear grade AISI type 304 stainless steel in the 5 and 30% pre-strained conditions. The results indicate that (a) nature of AE generation is different for different stages of deformation and (b) amount of cold work or pre-strain influences the magnitude of such AE generation. The observed results have been explained using the phenomena of varied localized deformation at the notch tip and deformation-induced α′-martensite formation in cold worked AISI type 304 stainless steel. An examination of the correlation between total AE counts (N) and stress intensity factor (K) has shown that the value of the exponent (m) in the relationship N=AK m decreases with increasing pre-strain. The formation of α′-martensite in unnotched specimens has been confirmed by equivalent δ-ferrite (%) content measurements. The examination of fracture surfaces by scanning electron microscopy (SEM) has indicated that the localized plastic deformation at the notch tip depends on the level of pre-strain. Springer Science+Business Media, LLC, 2007 Mukhopadhyay Chandan Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India aut Jayakumar Tamanna Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India aut Raj Baldev Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India aut Ray Kalyan Department of Metallurgical & Materials Engineering, Indian Institute of Technology, 721 302, Kharagpur, India aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/14(2007-07-01), 5647-5656 0022-2461 42:14<5647 2007 42 10853 https://doi.org/10.1007/s10853-006-1273-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1273-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mukhopadhyay Chandan Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India aut NATIONALLICENCE 700 1- Jayakumar Tamanna Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India aut NATIONALLICENCE 700 1- Raj Baldev Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India aut NATIONALLICENCE 700 1- Ray Kalyan Department of Metallurgical & Materials Engineering, Indian Institute of Technology, 721 302, Kharagpur, India aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/14(2007-07-01), 5647-5656 0022-2461 42:14<5647 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer