纳米贝氏体钢相变加速技术开发进展

摘要：纳米贝氏体的成功开发使得常规条件下对钢铁材料组织的纳米级细化成为可能，然而奥氏体中低温转变的热动力学条件限制了纳米贝氏体的相变速率，阻碍了纳米贝氏体钢的合金范围拓展和大规模工程应用。梳理了近期国内外学者针对这一问题开发的纳米贝氏体相变加速技术，综述了化学成分、预相变、预变形、强磁场等条件下贝氏体相变加速方面的进展。综合分析表明，针对贝氏体相变需充分考虑贝氏体形核以及长大2个过程。纳米贝氏体合金和工艺的设计需充分考虑各因素对2个过程的不同影响，充分优化贝氏体相变动力学和微观组织。复合相变加速技术可以成为纳米贝氏体钢开发的新方向。

Development of nanostructured bainite transformation acceleration technology

Abstract：The development of nanostructured bainite makes it possible to refine the microstructure of steel materials at the nanometer level under conventional conditions. However, the thermal dynamics conditions in the low temperature transition of austenite limit the transformation rate of nanostructured bainite and hinder the corresponding alloying development and industrial application. The acceleration technics of nanostructured bainite transformation developed by scholars, especially on conditions of chemical composition, pre transformation, pre deformation, and strong magnetic field were reviewed. The comprehensive analysis shows that bainite nucleation and growth should be separately considered for nano bainite transformation. The design of nanostructured bainite alloy and process should fully consider the different effects of various factors on the two processes, and optimize the transformation kinetics and microstructure of bainite at the same time. Composite phase transformation acceleration technic may be a new direction for the development of nanostructured bainite steels.