Texture and microstructure evolution during cold rolling of a strip cast and of a hot rolled austenitic stainless steel
- RWTH Aachen (Germany). Inst. fuer Metallkunde und Metallphysik
The microstructure and texture evolution of a strip cast and of a hot rolled austenitic stainless steel (18% Cr, 8.5% Ni) during cold rolling was studied (maximum thickness reduction {Delta}d/d{sub 0} = 80%). The microstructure of the hot band was homogeneous through the sheet thickness, except that in the center layer a small volume fraction of martensite appeared. The hot band texture revealed a through-thickness gradient which was discussed in terms of the shear distribution during hot rolling. The microstructure of the cast strip showed globular grains with martensite in the center layer and blocks of austenitic dendrites in the other layers. The formation of martensite was attributed to the deformation of the solidified films in the rolling gap. The strip cast sample revealed a weak texture fiber close to {l_brace}001{r_brace} uvw which was interpreted in terms of growth selection during solidification. During cold rolling in both types of samples the volume fraction of martensite increased up to ca. 50 vol.% (80% reduction). The cold rolling texture of the austenite was in both cases characterized by {l_brace}011{r_brace}<211> and {l_brace}111{r_brace}<100>. The cold rolling texture of the hot band was stronger than that of the strip cast sample which was attributed to the influence of the starting texture and of the grain size. The cold rolling texture of the austenite was simulated by means of a Taylor type model considering grain interaction and the so-called card glide mechanism. The martensite texture was characterized by {l_brace}211{r_brace}<011> and {l_brace}111{r_brace}<211>. The former component was interpreted in terms of the relaxation of shear constraints. The latter was attributed to selective phase transformation of {l_brace}011{r_brace}<211> (austenite) to {l_brace}332{r_brace}<113> (martensite) which then rotated towards {l_brace}111{r_brace}<112>. The rolling textures of the martensite were simulated using a Sachs type deformation model.
- OSTI ID:
- 483628
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 3 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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