Effects of Multiple Addition of Si and Mn on the Migration of α/γ Interphase Boundary

研究了高纯Fe-C-Si-Mn四元合金中双相(DP)钢和相变诱发塑性(TRIP)钢中的硅和锰对铁素体相变的影响及其产生机理。用溶质拖曳理论计算了由于锰和硅的相互作用而引起的锰和硅的共偏析，并与计算结果进行了比较。Mn和Si的扩散和在α/γ相界的偏析(或聚集)都延迟了相变，并可能产生文献中报道的铁素体生长的三个阶段。

The effects of Si and Mn, contained in dual-phase (DP) steel and Transformation-Induced-Plasticity (TRIP) steel, on ferrite transformation and the mechanism through which these elements produce the effects were studied in a high-purity Fe-C-Si-Mn quaternary alloy by deformation of austenite prior to transformation and magnetic heat treatment (the field strength is 8 Tesla). Results were compared with calculation taking into account the co-segregation of Mn and Si caused by the interaction between Mn and Si by means of the solute-drag theory. Diffusion of Mn and Si and segregation (or accumulation) at α/γ phase boundaries both delay the transformation and are likely to produce the characteristic three stages of ferrite growth reported in the literature.