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Study of ageing-induced α′-martensite formation in cold-worked AISI type 304 stainless steel using an acoustic emission technique

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Abstract

α′-martensite formation during cooling of cold-worked and aged AISI type 304 stainless steel has been studied by an acoustic emission technique. The ageing was carried out at 673 K for 1 h. A substantial amount of acoustic emission generated during cooling of cold-worked and aged AISI 304 stainless steel specimens compared to negligible acoustic emission observed during cooling (after ageing) of annealed AISI 304, annealed AISI 316 and cold-worked AISI 316 stainless steel specimens, was attributed to the α′-martensite formation from cold-worked 304 stainless steel specimens. The extent of martensite formation was relatively higher for 10% and 50% cold-worked specimens and lower for 20%–40% cold-worked specimens. The temperature range of martensite formation, as detected by the acoustic emission technique lies between 603 and 466 K. The formation of α′-martensite has been established to occur by a shear process.

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Authors and Affiliations

  1. Division for PIE and NDT Development, Indira Gandhi Centre for Atomic Research, Kalpakkam-603 102, Tamil Nadu, India

    C. K. Mukhopadhyay, T. Jayakumar, K. V. Kasiviswanathan & Baldev Raj

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  1. C. K. Mukhopadhyay
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  2. T. Jayakumar
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  3. K. V. Kasiviswanathan
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  4. Baldev Raj
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Mukhopadhyay, C.K., Jayakumar, T., Kasiviswanathan, K.V. et al. Study of ageing-induced α′-martensite formation in cold-worked AISI type 304 stainless steel using an acoustic emission technique. J Mater Sci 30, 4556–4560 (1995). https://doi.org/10.1007/BF01153062

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