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采用气氛保护中频炉熔炼新型铝青铜合金,铸锭经热轧后立即淬火,分别进行40%、50%、60%、70%和80%的冷轧变形,然后进行中间退火(700℃×2h)和成品退火(650℃×2h、700℃×2h、750℃×2h)处理,并在两次退火中间分别进行20%、40%和60%的冷轧变形。通过金相显微镜(OM)和透射电镜(TEM)研究了形变热处理参数对铝青铜合金析出相和相变驱动力的影响。结果表明,提高退火温度、增加冷轧变形量,可以增大相变驱动力。合理的形变热处理参数:60%～80%冷变形+700℃×2h中间退火+20%～40%冷变形+(650～750℃)×2h成品退火,可使析出相细小且分布均匀,合金具有较高的综合性能。
A new type of aluminum bronze alloy was melted in an atmosphere-protected medium-frequency furnace. The ingot was quenched immediately after hot rolling and subjected to cold rolling deformation of 40%, 50%, 60%, 70% and 80% respectively, followed by intermediate annealing (700 ℃ × 2h ) And finish annealing (650 ℃ × 2h, 700 ℃ × 2h, 750 ℃ × 2h), respectively, and 20%, 40% and 60% of the cold rolling deformation were carried out in the middle of the two anneals. The effects of deformation heat treatment parameters on the precipitates and transformation driving forces of aluminum bronze alloy were investigated by optical microscope (OM) and transmission electron microscope (TEM). The results show that increasing the annealing temperature and increasing the amount of cold rolling deformation can increase the driving force of phase transformation. Reasonable deformation heat treatment parameters: 60% ~ 80% cold deformation + 700 ℃ × 2h intermediate annealing + 20% ~ 40% cold deformation (650 ~ 750 ℃) × 2h finished annealing, the precipitated phase can be fine and evenly distributed, alloy Has a high overall performance.