通过电子背散射衍射(EBSD)实验,对挤压IN690高温合金管材的织构进行了研究。结果表明,孪晶与母体晶粒有着<111>/60o的取向差关系,从而导致IN690合金挤压变形后存在较多的60°的大角晶界。IN690合金的晶界以相干孪晶晶界(Σ3)重位点阵为主体。通过比较不同挤压参数对IN690合金管材Σ3晶界比例和织构的影响,发现当挤压温度在1200℃和挤压比λ=5时,挤压管材的抗腐蚀能力和塑性较好。 The texture of extruded IN690 superalloy was investigated by electron backscatter diffraction (EBSD). The results show that the twins and the host grains have a <111> / 60o orientation difference, resulting in the existence of more 60 ° large-angle grain boundaries after IN690 alloy is deformed. The grain boundaries of IN690 alloy are dominated by coherent twin crystal grain boundaries (Σ3) heavy lattice. By comparing the influence of different extrusion parameters on Σ3 grain boundary ratio and texture of IN690 alloy pipe, it is found that the extrusion pipe has better corrosion resistance and plasticity when the extrusion temperature is 1200 ℃ and the extrusion ratio λ = 5.