Abstract: The effect of different deformation on the microstructure evolution and properties of 5.3 mm thick GH4169 alloy plate was studied. The grain size and grain boundary characteristics were observed by optical microscope and EBSD analysis. The tensile strength， plasticity and other mechanical properties of the materials treated with two deformation amounts were compared， and the relationship between processing， microstructure and properties was established. The results show that the grain size and microstructure are significantly affected by different deformation amounts. Hot rolled plate after process A cold deformation （（thickening1.4 mm） of the grain size is 6 μ m， the small angle grain boundary （<10°） is 73.2%， the large angle grain boundary （> 10 °） is 26.8%， too fast deformation rate makes uneven deformation， the formation of mixed crystal， the proportion of deformation grain is 85.3%， substructure is 5.6%， recrystallization grain rate is 9.1%， After cold deformation of process B （0.7 mm thickening）， the grain size is 35 μ m， the proportion of small angle grain boundary （<10 °） is 51.6%， and the proportion of the large angle grain boundary （> 10 °） is 48.4%， the microstrusture is uniform， the proportion of twins is large， the substructure is 95.7%， the deformed grain is 3.4%， and the recrystallization grain proportion is 0.9%. The room temperature tensile strength and yield strength of cold deformation process A are significantly higher than that of cold deformation process B， but the elongation rate is lower than process B， and the properties of the final plate is attributed to the smaller grain size and higher substructure density of process A.

Key words: Deformation, GH4169, Microstructure, EBSD, Mechanical Properties

摘要： 研究了不同变形量对 GH4169合金5.3 mm厚板材组织演变和性能的影响，采用光学显微镜分析，EBSD分析等方法观察了晶粒尺寸、晶界特征，并对比了两种变形量处理下材料的拉伸强度、塑性等力学性能，确立加工-组织-性能之间的关系。结果显示，不同变形量对晶粒尺寸、显微组织都有显著影响，热轧板材经制度A冷变形（减厚1.4 mm）后的晶粒尺寸为6 μm，小角度晶界（<10°）占比为73.2%，大角度晶界（>10°）占比为26.8%，过快的变形速率使变形不均匀，形成混晶，变形晶粒占比例为85.3%，亚结构所占比例为5.6%，再结晶晶粒所占比例为9.1%。经制度B冷变形（减厚0.7 mm）后晶粒尺寸为35 μm，小角度晶界（<10°）占比为51.6%，大角度晶界（>10°）为48.4%，组织较均匀，孪晶比例较大，亚结构所占比例为95.7%，变形晶粒所占比例为3.4%，再结晶晶粒所占比例为0.9%。冷变形制度A的室温抗拉强度与屈服强度明显高于冷变形制度B，但断后伸长率低于制度B，最终板材的性能归因于制度A的晶粒尺寸更小和亚结构密度更高。

关键词: 变形量, GH4169, 显微组织, EBSD, 力学性能