Crystallographic Texture Evolution During Microstructure Refinement Processes Studied by Time-Of-Flight Neutron Diffraction

利用国产角度色散中子衍射仪和国外的飞行时间中子衍射仪对原位热压缩样品的体织构进行了定量测量，研究了双相区变形对动态铁素体相变的影响，发现在非均匀塑性变形过程中，铁素体动态再结晶发生在较低温度的双相区，导致动态铁素体相变较慢。冷压缩低合金钢试件在分步加热和冷却过程中的织构记忆现象与相变过程中的相变应变有关，而与原始试件中获得的形变储能无关。

The effect of dual phase region deformation on the dynamic ferrite transformation was investigated by quantitatively measuring the bulk textures of in situ hot-compressed samples through using a domestic angle dispersive neutron diffractometer and an oversea time-of-flight neutron diffractometer, and the relative slow dynamic ferrite transformation in lower temperature dual phase region was found due to the occurrence of dynamic ferrite recrystallization during heterogeneous plastic deformation. The texture memory phenomenon during the step-by-step heating and cooling of a cold compressed low alloy steel sample is related to the phase strains during phase transformation rather than the deformation stored energy obtained in the initial sample.