中文摘要：

Fe-32％Ni合金在形变温度550qC、形变速率2×10^-2s^-1的试验条件下，经过长、宽、高三个方向的多道次轮流压缩变形后，其奥氏体晶粒得到明显细化。通过金相组织观察，形变带扫描电镜观察、晶界取向差EBSD分析，认为其发生了低温动态再结晶，其机理为：随着不同方向的强烈塑性变形，形变带复杂化，相互交割，将原始晶粒有效地分割细化，从而形成许多小亚晶，随着后续变形，这些小亚晶逐渐倾转导致亚晶界逐渐大角化，最终形成相互独立的新晶粒。

英文摘要：

The austenite grains of Fe-32%Ni alloy were obviously refined after it was alternately compressed in three directions along length, width and thickness at 550℃ with the strain rate of 2 × 10^-2s^-1. It was considered that the low temperature dynamic recrystallization was completed after observing the micrographs with Light Optical Microscope （ LOM）, investigating the deformation band with Scanning Electron Microscope （SEM） and analyzing the grain orientations with Electron Back Scatter Diffraction （EBSD）. The grain refinement mechanism was that along with the intensive deformation in different directions, the deformed bands became complex and crossed each other to subdivide the austenite grain into several subgrains, and these subgrains were gradually angled to new independent grains with their boundaries being transformed into big angle boundaries in subsequent deformation.