冷变形及退火工艺对617B合金组织性能的影响

Effect of Cold Rolling and Annealing Process on Microstructure and Properties of 617B Alloy

研究了冷加工变形量、退火温度和退火时间对617B合金管材组织及力学性能的影响。结果表明:随着变形量的增大,晶粒沿着最大主变形方向被拉长,形成了长条状的形变带,合金室温抗拉强度和屈服强度逐渐提高,延伸率下降;当退火温度从1080℃提高到1160℃时,随着退火温度的提高,合金的晶粒逐渐长大,抗拉强度和屈服强度降低,塑性提高,退火温度到1160℃以上继续提高温度,晶粒长大速度明显增大,强度和塑性变化不大;不同变形量下合金晶粒长大的激活能Q均远大于纯Ni的自扩散激活能,且Q值随着变形量的增加先升高后降低;合金晶粒长大指数η值随着退火温度的提高先增大后减小。

The effect of cold processing deformation, annealing temperature and annealing time on the microstructure and mechanical properties of 617 B alloy was studied. The results show that with the increase of deformation, grains are elongated along the direction of maximum principal strain to form a deformed strip belt, the tensile strength and yield strength of the alloy at room temperature gradually increase, while the elongation decreases. When the annealing temperature increases from 1080 oC to 1160 oC, the grains of the alloy gradually grow up, the tensile strength and yield strength are reduced, and the ductility is improved. When the annealing temperature of1160 oC continues to increase, the grain growth velocity increases obviously, while the strength and plasticity changes little; grain growth activation energy（Q） of the alloy with different deformation amounts is much higher than that of pure Ni, and the Q value increases first s and then decreases with the amount of deformation increasing; the grain growth exponent η of the alloy increases first and then decreases with the increase of annealing temperature.