Abstract
Kinetics of deformation bands in a low-carbon steel – stainless steel bimetal
Highlights
Macroscopic non-uniformity and instability of plastic flow arise at sample size scales as mutually consistent changes in stress-strain curves σ(ε) and strain localization patterns [1]
As for the similarity, it is worth mentioning that the Lüders bands (LB) fronts and the Portevin-Le Chatelier (PLC) bands are the macroscopic phenomena of plastic strain localization, which are the narrow moving bands with plastic strain inside them
Noticeable differences between these phenomena are observed at the developed strain localization stage associated with LB and PLC effects [5]
Summary
Macroscopic non-uniformity and instability of plastic flow arise at sample size scales as mutually consistent changes in stress-strain curves σ(ε) and strain localization patterns [1]. Loading the bimetal composed of metals with various mechanical properties may give rise to additional internal stresses In this respect, unlike the stainless steel, where the strain-induced γ - α’ - phase transition occurs under severe plastic deformations [13], the martensite transformation in the bimetal stainless steel clad layer begins immediately after the end of the yield point. By analogy with PLC bands, the single plastic strain localization fronts for a monolithic stainless steel sample were observed under severe deformations at the discontinuous flow stage They were caused by the interactions between the intercalated carbon atoms and the mobile dislocations in the martensite α’ - phase formed by the strain-induced γ - α’ phase transition [13]. One can affirm that the 750 μm thick stainless steel clad layer in case of bimetal does not suppress the formation of LBs, but increases the propagation velocity of the LB front in both the low – carbon steel base layer and the clad layer, as compared to data from the individual low – carbon and stainless steel components
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