本文選題：FeCrMoCu合金 + Cu��； 參考：《金屬學(xué)報(bào)》2017年05期

【摘要】：采用掃描透射電鏡(STEM)和動(dòng)態(tài)機(jī)械分析儀(DMA)研究了FeCrMoCu合金(Cu添加量為1.0%和2.0%,質(zhì)量分?jǐn)?shù))在不同冷速條件下Cu的析出行為及其對阻尼性能和力學(xué)性能的影響。結(jié)果表明:1.0Cu合金中Cu主要以過飽和的形式固溶在基體,當(dāng)冷速較慢(爐冷)時(shí)會(huì)析出少量的富Cu相,該相尺寸較小(5nm),Cu含量較低(3.7%);Cu增加到2.0%后,隨著冷速的下降(從水冷到空冷,最后到爐冷),合金中先析出數(shù)量較少、尺寸較小的富Cu相,隨后析出數(shù)量較多、尺寸稍大的球狀第二相(10~15nm),最后析出相粗化成圓棒狀(100~400nm)但數(shù)量顯著減少,后2種析出相的Cu含量明顯增加(30%~40%)。含Cu第二相的析出,明顯增加合金平均內(nèi)應(yīng)力,使合金的阻尼性能顯著下降,因此有第二相析出的2.0Cu合金阻尼性能明顯低于1.0Cu合金。與此同時(shí),合金的強(qiáng)度隨著富Cu相的析出而明顯提高,其中尺寸較小的富Cu相析出強(qiáng)化效果較好,且對塑韌性的影響相對較小。含1.0%Cu的FeCrMoCu合金可以同時(shí)獲得較好的阻尼性能和力學(xué)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.
【作者單位】： 中國科學(xué)院金屬研究所中國科學(xué)院核用材料與安全評價(jià)重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)技術(shù)大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目No.51301170~~
【分類號】：TG135
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本文編號：1786837