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将沉淀强化型奥氏体钢在980℃固溶1 h后淬火,然后在500~850℃时效4 h,750℃析出强化效果最好。结合透射电子显微镜(TEM)和场离子显微镜(FIM),用原子探针层析技术(APT)研究强化相析出过程。结果表明,析出相为球形,是与基体共格的面心立方结构的γ’-Ni3(Al,Ti)相。随着时效温度提高,析出相尺寸增大,密度降低,Al元素和Ti元素在析出相与基体中的分配比逐渐提高,Ti元素的分配比明显高于Al元素,表现出更强的析出倾向。
The precipitation strengthened austenitic steels quenched at 980 ℃ for 1 h and then quenched at 500 ~ 850 ℃ for 4 h, the precipitation strengthening effect is the best at 750 ℃. Combined with transmission electron microscopy (TEM) and field ion microscopy (FIM), the enhanced phase precipitation process was investigated by atomic probe tomography (APT). The results show that the precipitated phase is spherical and is a γ’-Ni3 (Al, Ti) phase of the face-centered cubic structure conformal with the matrix. With the increase of aging temperature, the precipitated phase increases in size and densities decrease. The distribution ratio of Al and Ti gradually increases between the precipitates and the matrix. The distribution ratio of Ti is obviously higher than that of Al, which shows a stronger precipitation tendency .