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On the low temperature deformation behavior of a warm rolled 304L-type stainless steel
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DOI：10.1016/j.mtla.2025.102372.png)
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Abstract
En 中文
The deformation behavior of a warm rolled 304L-type austenitic stainless steel was studied by means of tensile tests at temperatures of 213 - 293 K. The starting material was subjected to warm rolling to a strain of 0.5 at 573 K. This warm working promoted the alpha'-martensite formation upon subsequent tensile tests at lowered temperatures owing to shortening the transformation critical strain. The fraction of alpha'-martensite comprised more than 0.2 after tension to a strain of 0.3 at 293 K, whereas that was above 0.8 at 213 K. Moreover, the cold deformation was accompanied by twinning and the development of strain-induced grain boundaries leading to submicrocrystalline microstructure evolution. The deformation behavior during tensile tests was characterized by a rapid increase in the flow stress in the strain range of 0.1 - 0.25 that was more pronounced at a lower temperature. The tensile flow stress could be related to the dislocation density, which in turn can be expressed by a function of strain, taking into account the grain subdivision by strain-induced boundaries and martensitic transformation.
Keywords:
304L austenitic stainless steel
Strain hardening
Phase transformation
Deformation twinning
Dislocation density
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