High-tech composites to ancient metals

Zhang, S. Y.*; Godfrey, E.*; Kockelmann, W.*; Paradowska, A.*; Bull, M. J.*; Korsunsky, A. M.*; Abbey, B.*; Xu, P. G.; Tomota, Yo*; Liljedahl, D.*; et al.

Materials Today, 12(7-8), p.78 - 84, 2009/07

https://doi.org/10.1016/S1369-7021(09)70233-0

Neutron diffraction methods offer a direct measure of the elastic component of strain deep within crystalline materials through precise characterisation of the interplanar crystal lattice spacing. The unique non-destructive nature of this measurement technique is particularly beneficial in the context of engineering design and archaeological materials science, since it allows the evaluation of a variety of structural and deformational parameters inside real components without material removal, or at worst with minimal interference. We review a wide range of recent experimental studies using the Engin-X materials engineering instrument at the ISIS neutron source and show how the technique provides the basis for developing improved insight into materials of great importance to applications and industry.

Dynamic ferrite transformation behavior during hot deformation of low alloy steels studied by neutron diffraction

Xu, P. G.; Tomota, Yo*; Paradowska, A.*; Vogel, S. C.*

no journal, , 

The deformation induced ferrite transformation at two different strain rates was carried out to compare that during isothermal holding without deformation and the effects of hot deformation and strain rate on the dynamic transformation evolution was investigated. It confirmed that the deformation induced ferrite transformations could appear not only in the austenite single phase region, but also in the austenite-ferrite dual phase region. It was found that the high strain rates were helpful to accelerate the ferrite transformation at different temperatures. Moreover, the low temperature deformation was more effective than the high temperature to promote the ferrite transformation until a critical strain, and then the accelerating effect of low temperature deformation on ferrite transformation was weakened because of the evident increment of carbon concentration in austenite and the appearance of dynamic recrystallization of ferrite.

Ausformed bainite transformation behaviors studied by in situ neutron diffraction

Gong, W.; Tomota, Yo; Harjo, S.; Paradowska, A.*

no journal, ,