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Cold unidirectional/cross‑rolling of austenitic stainless steels: a review

Mohammadzehi Sara, Mirzadeh Hamed

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 3

art. no. e129

The effects of cold unidirectional/cross-rolling on the development of substructure, strain-induced martensitic transformation, crystallographic texture (preferred orientation), and mechanical properties, as well as the microstructure after subsequent annealing of metastable austenitic stainless steels were overviewed. First, the deformed state was discussed. Compared to unidirectional rolling, it was revealed that cross-rolling leads to the formation of a greater amount of deformation-induced martensite, which is related to the generation of numerous intersecting shear bands and nano-twins, as well as a higher dislocation density in the austenite phase (activation of higher number of slip/twinning systems). It was concluded that these effects are more pronounced at low reductions in thickness. Regarding texture evolution, cross-rolling tends to strengthen the Brass component in the retained austenite phase. Subsequently, the mechanical properties were reviewed, where it was concluded that a more rapid work-hardening and higher strength/hardness at low strains can be obtained due to the effects of cross-rolling on the microstructure. Moreover, while the effects of cross-rolling on the strength at high rolling reductions might not be significant, it is possible to decrease the anisotropy of the sheet due to the alternate change in the rolling direction. Afterward, the annealing of cold-rolled sheets was discussed. It was deduced that cross-rolling might be used for more intense grain refinement based on the thermomechanical processing of cold-rolling and reversion/recrystallization annealing, where the activation of greater number of slip systems, higher dislocation density, and greater martensite content in the deformed state are responsible in this regard. Finally, the suggestions for future works were proposed.

Wpływ pasm ścinania na teksturę i własności mechaniczne walcowanej miedzi

Stalony-Dobrzański F., Bochniak W.

Rudy i Metale Nieżelazne

2006

R. 51, nr 1

11-25

Wykazano związek pomiędzy zjawiskami strukturalnymi a teksturą i własnościami mechanicznymi miedzi poddanej jednokierunkowemu i krzyżowemu walcowaniu oraz próbie rozciągania. W szczególności, ujawniono dominującą rolę mechanizmu zlokalizowanego plastycznego płynięcia w pasmach ścinania po zmianie drogi odkształcenia wywołanej rozciąganiem próbek w kierunku prostopadłym do kierunku walcowania. Znalazło ono również odzwierciedlenie w obrazach tekstury odkształcanej miedzi oraz dwukrotnie wyższej wartości współczynnika Lankforda w porównaniu z wartością określoną z próbek poddanych rozciąganiu w kierunku zgodnym z kierunkiem walcowania.

Relationship between structural phenomena, texture and mechanical properties of copper subjected to non-reversing rolling, alternate longitudinal and cross rolling and to a tensile test, has been proved. In particular, the dominant role of a mechanism of localized plastic flow in the shear bands after the change of a strain path caused by tension applied perpendicularly to the rolling direction has been revealed. This phenomenon has also been reflected in the images of a texture of copper under deformation and in twice higher value of a Lankford’s coefficient compared to that determined for the samples subjected to the tensile test in the direction consistent with the rolling direction.