Full length articlePlastic yielding in lath martensites – An alternative viewpoint
Graphical abstract
Section snippets
Background
Quench-hardened medium carbon steels are undergoing a remarkable renaissance at present due to their high strength and potential for weight-saving, especially in vehicles. Although their formability is quite limited, some degree of ductility is needed in component manufacture as well as in crash situations. This concern is reflected in quite a large number of publications describing the nature of the lath martensitic microstructures [[1], [2], [3], [4], [5], [6], [7], [8], [9], [10]] and,
Conclusions
The combination of in-situ synchrotron deformation and CPFEM modelling shows that the presence of (Type II) residual stresses in martensite created during the transformation from austenite is the most important factor controlling its yielding behaviour on loading. Microstructural influences such as lath shape or carbon distributions may also play a role but are of lesser significance.
The probably unique phenomenon for martensite whereby diffraction peaks become narrower during straining is
Acknowledgements
The experiments were undertaken on the Powder Diffraction beamline at the Australian Synchrotron, Victoria, Australia. The authors thank Dr Sitarama Kada (Deakin University) for his assistance during those measurements. They also thank Professor Christopher Magee (MIT) for his comments on the manuscript. Materials were provided by SSAB Europe as part of a long-term R&D collaboration.
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