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将Fe-Cu-Ni-Al和Fe-Cu-Ni-Al-Mn钢900℃固溶2 h后水淬,在500℃时效不同时间,利用硬度测试和原子探针层析技术(APT)研究Mn对钢中多元强化相析出过程的影响.硬度测试结果显示,Mn的加入增强了钢时效初期的析出强化效果,加快了整个析出强化的进程.APT结果表明,Mn提高了时效初期析出相的形核率,加快了析出相的长大和粗化速率,进一步加速了富Cu相和Ni Al相的分离.这是由于Mn可降低析出相的形核能,加快各元素在基体中的扩散速率,同时Mn取代Ni Al相中Al的位置,在Ni Al相中形成缺陷,加速了Cu在其中的扩散速率.
The Fe-Cu-Ni-Al and Fe-Cu-Ni-Al-Mn steels were solution-hardened at 900 ° C for 2 h and then water-quenched at 500 ° C for different times. Hardness tests and atomic probe spectroscopy (APT) Mn on the precipitation process of multiple strengthening phases in steel.The results of hardness test showed that the addition of Mn enhanced the precipitation strengthening effect at the initial stage of steel aging and accelerated the whole precipitation strengthening process.APT results showed that Mn increased the precipitation phase The nucleation rate accelerates the growth and the roughening rate of the precipitated phase and further accelerates the separation of the Cu-rich phase and the NiAl phase, because Mn can reduce the nucleation energy of the precipitated phase and accelerate the diffusion rate of each element in the matrix, At the same time, Mn replaces the Al site in the Ni Al phase and forms defects in the NiAl phase, accelerating the diffusion rate of Cu therein.