Anomalous plastic deformation and martensitic transformation in metastable austenitic steels at low strain rate characterized by in-situ hydrogen and argon releases and scanning probe microscopy

作者：Zhang L; An B^*; Iijima T; Fukuyama S; Yokogawa K

来源：Journal of Applied Physics, 2011, 110(3): 033540.

DOI：10.1063/1.3622516

Plastic deformation behavior and strain-induced martensite (alpha') transformation in metastable austenitic stainless steel sheets are investigated during tensile loading at a slow strain rate of 1.7 x 10(-4) s(-1) at 298 K by in situ hydrogen and argon releases and scanning probe microscopy. Anomalous stress peaks, which occur on the stress-strain curve in the later half stage of plastic deformation, are simultaneous with distinct hydrogen release peaks and argon release valleys, and the alpha' content measured at a fixed region increases stepwisely with increasing strain in the corresponding stage of deformation. Such anomalous deformation and alpha' transformation phenomena result from repeatedly occurring and propagating of X-shaped strain localization accompanied by the rapid alpha' transformation in the later half stage of deformation.

• 出版日期2011-8-1