Abstract:  In order to obtain GH4169 alloy wire with stable microstructure and properties， the effects of different cold drawing deformation and annealing process on the microstructure and properties of GH4169 alloy wire were studied.Two cold deformation paths were used to prepare 5.84 mm wires， and the intermediate wires were heat treated at 1 020 ℃/1 min and 1 020 ℃/10 min. Optical microscope analysis of the prepared wire and the sample after heat treatment， EBSD analysis and other methods to observe the grain size and grain boundary characteristics， and compare the mechanical properties of the two kinds of processes of wires， such as tensile strength and plasticity， to establish the relationship between parameters-microstructure-properties.The results showed that the wires’ grains obtained by the process of small deformation + more annealing times were large， which cannot meet the requirements of the index. The grain size of the wire obtained by increasing the deformation and reducing the annealing times was small， and the tensile strength and plasticity were improved. After heat treatment at 1 020 ℃/1 min， there were still many substructures in the wire sample， most of the grains were deformed grains， the proportion of deformed grains was 73%， and the proportion of recrystallized grains was 16.4%；After heat treatment at 1 020 ℃/10 min， the substructure in wire sample almost disappeared， most of the grains were recrystallized grains， the proportion of recrystallized grains was 93%， and the proportion of deformed grains was only 1.13%. Cold-drawn wire was very sensitive to heat treatment， and the recrystallization process could be completed in a very short time. The optimum fabrication process for GH4169 alloy wire is to cold-roll 8.5 mm wire to 6.6 mm， then perform an in-line annealing at 1 020 °C， 2.5 m/min， and hydrogen atmosphere， and finally cold-roll to 5.84 mm.

Key words: GH4169, Cold Drawing Process, Annealing Treatment, EBSD, Mechanical Property

摘要： 为了获得组织性能稳定的GH4169合金丝材，研究了不同冷拉变形量和退火处理工艺对GH4169合金丝材组织和性能的影响。采用两种冷变形路径制备5.84 mm的丝材，并对中间丝材进行1 020 ℃/1 min和1 020 ℃/10 min的热处理。对制备的丝材和热处理后的试样进行光学显微镜、EBSD等观察晶粒尺寸、晶界特征，对比两种工艺丝材的拉伸强度、塑性等力学性能，确立参数-组织-性能之间的关系。结果表明：变形量小+退火次数多的工艺获得的丝材晶粒较大，不能满足要求，增加变形量并减少退火次数获得的丝材晶粒尺寸小，抗拉强度和塑性均得到提高。1 020 ℃/1 min热处理后，丝材试样中亚结构仍然大量存在，大部分晶粒为变形晶粒，变形晶粒的比例达到73%，再结晶晶粒比例为16.4%；1 020 ℃/10 min热处理后，丝材试样中亚结构几乎消失，大部分晶粒为再结晶晶粒，再结晶晶粒比例为93%，变形晶粒的比例仅为1.13%。冷拉后的丝材对热处理十分敏感，在短时间内就可以完成再结晶过程。GH4169合金丝材的最佳制备工艺为8.5 mm冷轧至6.6 mm后进行1 020 ℃、2.5 m/min、氢气气氛在线退火最后冷轧至5.84 mm。

关键词: GH4169合金, 冷拉过程, 退火处理, EBSD, 力学性能