| Abstract Scope |
Moving beyond the original use of TTT diagrams to capture proeutectoid ferrite, pearlite, and bainite, phase transformations as diverse as discontinuous precipitation and coarsening, continuous precipitation, order-disorder, spinodal decomposition, massive transformation, and isothermal martensite have been captured. Although the qualitative understanding of the C-curve shapes is well-established, comparison between theory and experiment of their quantitative shapes across multiple alloy systems and reactions is lacking. This work will examine the factors that determine relative locations of the various curves in alloys as a function of alloy content and diffusion mechanism. Consideration is given to alloys exhibiting multiple competitive reactions. The influence of measurement technique on the published curves will be one factor of interest, with a view towards their possible blind spots, biasing towards earlier vs later times, and convolution of simultaneous reactions. The emphasis will be on nonferrous, especially uranium alloys. |