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贝氏体相变机制是固态相变领域中争论时间最长、分歧最大的问题之一.切变和扩散两大学派对此均开展了大量研究工作,所得结果各自不同,观点亦大相径庭.本世纪60年代,美国学者Aaronson将蒸汽凝聚或液相凝固成晶体的台阶生长机制引入固态相变,建立了扩散控制的台阶长大模型,成功地解释了许多片状相及贝氏体相变的实验现象.迄今,已在许多钢和有色合金的贝氏体中发现了台阶结构,为扩散机制提供了实验依
The bainite transformation mechanism is one of the most controversial and disagreeable problems in the field of solid phase transformation, and both the school of shear and proliferation have carried out a large amount of research work, and the results obtained are very different from each other and the opinions are very different. In the 1960s, the American scholar Aaronson introduced the step growth mechanism of steam condensation or liquid phase solidification into crystals into the solid state phase transition, established a diffusion-controlled step-growth model and successfully explained many experiments of lamellar phase and bainite transformation So far, step structures have been found in the bainite of many steels and non-ferrous alloys, providing an experimental basis for the diffusion mechanism