ZrC粒子, 形变诱导铁素体相变, 晶粒细化, 热力学条件

The effects of ZrC particles on thermodynamic conditions of low carbon steel during DIFT were studied by unidirectional compression thermal simulating experiment.The results show that ZrC particles with definite radius and suitable volume fraction as the nucleus of deformation and recrystallization,it can improve the start temperature and reduce critical deformation of DIFT, and greatly improve α-Fe nucleating rate which leads to the ferrite grains further refinement.However,the role of ZrC particles in promoting nucleation exists a critical value, an excessive amount of particles will produce inhibition of ferrite core, it is not conducive to the organization refinement. Based on thermodynamic theory of phase transitions, a laboratory rolling process is developed, and obtains the ferrite grain size of low carbon steel plate up to 3.9μm, material yield strength reached 802MPa, it significantly improves overall performance.

ZrC particle, deformation induced ferrite transformation(DIFT), grain refinement;thermodynamic condition