Investigation and modelling of theplasticity-induced martensite formation in metastable austenites

Abstract

Mechanical stress -strain hysteresis, temperature and magnetic measurements were performed for the detailed characterisation of the cyclic deformation behaviour of metastable austenitic steels with particular attention to plasticity-induced martensite formation. Specimens of AISI 304, AISI 321 and AISI 348 stainless steels were investigated under plastic strain control at ambient temperature. On the basis of comprehensive experimental data, a model was developed for the description of the plasticity-induced martensite formation in metastable austenites under cyclic loading. The process of martensite formation was described as a function of the cumulative plastic strain and the cumulative strain energy density.Keywords: Cyclic deformation behaviour; Mechanical stress -strain hysteresis, temperature and magnetic measurements; Metastable austenitic steels; Plasticity-induced martensite formation; Modelling of martensite formation Int.

Frequency‐dependent fatigue and corrosion fatigue assessment of brazed AISI 304L/BNi‐2 joints in air and synthetic exhaust gas condensate

“…The chemical composition according to the test certificate is listed in Table . For AISI 304L, plastic deformations can lead to a phase transformation from paramagnetic austenite to ferromagnetic martensite . A commercially available nickel‐based brazing alloy BNi‐2 (Ni 620) with the chemical composition Ni‐7Cr‐4.5Si‐3.2B‐3Fe was applied as a 50‐ μm amorphous brazing foil between the base material prior to the brazing.…”

“…The effect of the loading frequency on the fatigue behaviour of metastable austenitic stainless steels has already been extensively researched . Different effects of higher frequencies are reported with both an increase and a decrease in lifetime.…”

The effect of hydrogenation on structure and strength properties of austenitic stainless steel Fe-18Cr-9Ni-Ti

“…MS-values determined by magnetization saturation analysis. For initial state, the values of H , 0.2 , uts , and tot are given from work[7] …”

Influence of Matrix Strength and Volume Fraction of Mg‐PSZ on the Cyclic Deformation Behavior of Hot Pressed TRIP/TWIP‐Matrix Composite Materials

“…The M d30 temperature defines the temperature at which 50% α′‐martensite is transformed under tension as a result of 0.30 true strain . In literature various empirical equations have been derived for calculating M s and M d30 , see ref …”