Steel name: 0.037C-0.61Si-0.68Nb
  Diagram No.: 3807
  Type of diagram: TTP
  Chemical composition in weight %: 0.037% C, 0.61% Si, 0.68% Nb.
  Note: TTP diagram from Powell et al. In their alloy (0.68Nb, 0.037C, 0.61Si wt%), G-Phase forms
  between 500 and 850 C, first on residual grain boundary particles of NbC, and only after very long
  ageing on NbC particles in the matrix. The authors propose that this is due to the easier diffusion
  of required elements in the grain boundaries.
  Source: T. Sourmail, PrecipitaTES in creep resistant austenitic stainless steels, Mat.Sci.Tech. 2001:
  17-1 p1-14. Powell D. J, Pilkington R., and Miller D. A., The Precipitation Characteristics of
  20%Cr/25%Ni-Nb Stanilised Stainless Steel., Acta Metall., 36(3):713-724, 1988.

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