弥散强化钨镍铁高比重合金的制备及性能研究

发布时间：2018-04-09 21:46

  本文选题：钨镍铁　切入点：高比重合金　出处：《稀有金属》2017年01期

【摘要】：钨基高比重合金在航天航空、兵器等行业中有着广泛应用,但传统钨镍铁高比重合金需通过后续形变强化处理提高力学性能,限制了其在国防工业和民用领域的广泛应用。利用弥散强化手段,当强化相在基体内呈弥散质点或粒状分布时,可显著提高合金强度和硬度,且塑性和韧性下降不大。本文研究了Y_2O_3弥散强化95W-3.5Ni-1.5Fe合金的制备工艺及性能。与传统钨镍铁高比重合金制备相比,本文首先利用化学气相迁移机制制备Y_2O_3分布在颗粒内部的弥散强化钨粉,重点研究原料种类对弥散强化钨粉粒度的影响以及成形、烧结工艺,利用X射线衍射(XRD)分析、场发射扫描电子显微镜(FESEM)对弥散强化钨粉及弥散强化钨进行性能表征。结果表明:WO2.9+Y_2O_3体系制备的弥散强化钨粉粒度最小,约1μm;经1480℃烧结90 min,弥散强化钨镍铁高比重合金的相对密度达98.6%,Y_2O_3在钨晶粒内呈弥散分布;钨合金的显微硬度达HV 532,表现出较高韧性。
[Abstract]:Tungsten based high specific gravity alloys are widely used in aerospace and weapon industries, but the traditional tungsten nickel iron high gravity alloys need to improve their mechanical properties through subsequent deformation strengthening treatment, which limits their wide application in national defense industry and civil fields.By means of dispersion strengthening, the strength and hardness of the alloy can be significantly increased when the strengthening phase is dispersed or granular in the matrix, and the ductility and toughness of the alloy are not much decreased.The preparation process and properties of Y_2O_3 dispersion-strengthened 95W-3.5Ni-1.5Fe alloy were studied in this paper.Compared with the traditional high specific gravity tungsten nickel iron alloy, in this paper, we first use the chemical vapor migration mechanism to prepare the dispersion strengthened tungsten powder with Y_2O_3 distribution inside the particle, focusing on the influence of the raw materials on the particle size and the forming of the dispersion strengthened tungsten powder.The properties of dispersion-enhanced tungsten powder and diffusion-enhanced tungsten powder were characterized by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD) analysis.The results show that the particle size of dispersion-strengthened tungsten powder prepared by Y_2O_3 system is the smallest, about 1 渭 m, and the relative density of dispersion-strengthened Ni-Ni-Fe high gravity alloy is 98.6% after sintering at 1480 鈩，

本文编号：1728316