An assessment of the contributing factors to the superior properties of a nanostructured steel using in situ high-energy x-ray diffraction.
In contrast to most nanostructured materials, outstanding mechanical property has been demonstrated in a nanostructured metastable austenitic steel, owing to the new characteristics of deformation-induced martensitic transformation. In this paper, by employing an in situ high-energy X-ray diffraction technique, we explore these characteristics by examining factors from the load partitioning, Lueders banding, to texture development. It was found that the martensitic transformation was mainly driven through Lueders band propagation. Marked load transfer takes place from austenite to martensite as Lueders band propagates, and continues into the homogeneous deformation regime. The texture development is mostly contributed by martensitic transformation, but dislocation-based plasticity also plays a role. The effective load partitioning along with the deformability of martensite promotes sample ductility.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 977368
- Report Number(s):
- ANL/XSD/JA-65836; ACMAFD; TRN: US201009%%715
- Journal Information:
- Acta Materiala, Vol. 58, Issue 7 ; Apr. 2010; ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- ENGLISH
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