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研究相同锻造工艺下的TC6合金Ф50mm棒材经不同的热处理工艺处理后,其显微组织、室温拉伸性能、高温抗拉强度及冲击韧性的差别。结果表明:普通退火后的组织由细小的初生α和β相组成,双重退火和等温退火后的组织由初生α相、β相和次生α相组成;双重退火的室温及400℃拉伸强度都高于普通退火和等温退火,但塑性最差,普通退火的强度与塑性匹配最好;普通退火后棒材的冲击韧性最高,可达60J/cm2,等温退火次之,双重退火最差。
The differences of microstructure, tensile properties at room temperature, tensile strength at high temperature and impact toughness of TC6 alloy Ф50mm bar under the same forging process after different heat treatment processes were studied. The results show that the microstructure of normal annealed microstructure is composed of tiny primary α and β phases, and the structure of double annealed and isothermal annealed is composed of primary α phase, β phase and secondary α phase. The room temperature of double annealing and the tensile strength at 400 ℃ Which is higher than that of ordinary annealing and isothermal annealing, but the plasticity is the worst. The strength and plasticity of ordinary annealing are the best. The average toughness of ordinary annealed bar is up to 60J / cm2, the isothermal annealing is the second, and the double annealing is the worst.