Cu的析出及其对FeCrMoCu合金阻尼性能和力学性能的影响

发布时间：2018-04-22 10:29

  本文选题：FeCrMoCu合金 + Cu　； 参考：《金属学报》2017年05期

【摘要】：采用扫描透射电镜(STEM)和动态机械分析仪(DMA)研究了FeCrMoCu合金(Cu添加量为1.0%和2.0%,质量分数)在不同冷速条件下Cu的析出行为及其对阻尼性能和力学性能的影响。结果表明:1.0Cu合金中Cu主要以过饱和的形式固溶在基体,当冷速较慢(炉冷)时会析出少量的富Cu相,该相尺寸较小(5nm),Cu含量较低(3.7%);Cu增加到2.0%后,随着冷速的下降(从水冷到空冷,最后到炉冷),合金中先析出数量较少、尺寸较小的富Cu相,随后析出数量较多、尺寸稍大的球状第二相(10~15nm),最后析出相粗化成圆棒状(100~400nm)但数量显著减少,后2种析出相的Cu含量明显增加(30%~40%)。含Cu第二相的析出,明显增加合金平均内应力,使合金的阻尼性能显著下降,因此有第二相析出的2.0Cu合金阻尼性能明显低于1.0Cu合金。与此同时,合金的强度随着富Cu相的析出而明显提高,其中尺寸较小的富Cu相析出强化效果较好,且对塑韧性的影响相对较小。含1.0%Cu的FeCrMoCu合金可以同时获得较好的阻尼性能和力学性能。
[Abstract]:The precipitation behavior of Cu and its effect on damping and mechanical properties of FeCrMoCu alloy at different cooling rates were studied by scanning transmission electron microscopy (TEM) and dynamic mechanical analyzer (DMA). The Cu content of FeCrMoCu alloy was 1.0% and 2.0% by mass fraction. The results show that Cu is mainly dissolved in the matrix in the form of supersaturation. When the cooling rate is slow (furnace cooling), a small amount of Cu-rich phase will be precipitated. When the size of the phase is smaller and the Cu content is lower than 3.7wt%, the content of Cu increases to 2.0%, and with the decrease of cooling rate (from water cooling to air cooling), Finally, at the end of the furnace cooling, the amount of precipitated phase in the alloy is relatively small, the size of the Cu-rich phase is smaller, then the amount of the precipitated phase is larger, the spherical second phase is 1015nm / m, and the final precipitated phase is coarsely formed into a rod-shaped alloy (100nm), but the quantity of the precipitated phase is significantly reduced. The Cu content of the latter two precipitates increased significantly. The precipitation of the second phase containing Cu obviously increases the average internal stress of the alloy and decreases the damping property of the alloy, so the damping property of the 2.0Cu alloy with the second phase precipitation is obviously lower than that of the 1.0Cu alloy. At the same time, the strength of the alloy increases obviously with the precipitation of Cu-rich phase, in which the smaller Cu-rich phase has a better precipitation strengthening effect, and the effect on ductility is relatively small. Both damping and mechanical properties of FeCrMoCu alloy containing 1.0%Cu can be obtained at the same time.
【作者单位】： 中国科学院金属研究所中国科学院核用材料与安全评价重点实验室;中国科学技术大学材料科学与工程学院;
【基金】：国家自然科学基金项目No.51301170~~
【分类号】：TG135
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本文编号：1786837