冷却速率对Ti-22Al-24Nb-0.5Mo合金显微组织和拉伸性能的影响
发布时间：2018-08-07 14:17
【摘要】：对Ti-22Al-24Nb-0.5Mo合金(摩尔分数,%)进行固溶后,分别以炉冷、空冷、油淬和水淬4种不同的冷却速率冷却到室温,再进行相同的时效处理,采用扫描电子显微镜(SEM)观察,发现空冷、油冷和水淬得到的显微组织为在B2/β相基体上析出弥散分布的α_2相(等轴的和针状的)和细小的O相板条构成的双态组织,且发现随冷速增快,在冷却过程中析出的α_2相减少,保留BCC相增加;炉冷时得到无序的β相,油冷时得到有序的B2相;4种冷却速率中,只有炉冷的过程中有O相析出;对不同冷却速率的试样进行性能测试,发现随冷速的增大,650℃的抗拉强度逐渐增大,室温的强度和塑性也有上升的趋势。
[Abstract]:After solid solution of Ti-22Al-24Nb-0.5Mo alloy (mole fraction of%), four cooling rates of furnace cooling, air cooling, oil quenching and water quenching were used to cool the alloy to room temperature, and then the same aging treatment was carried out. The results of scanning electron microscopy (SEM) showed that air cooling was found. The microstructure obtained by oil cooling and water quenching is a two-state structure composed of 伪 -S _ 2 (equiaxed and needle-shaped) and fine O phase strips precipitated on B _ 2 / 尾 matrix, and it is found that the 伪 _ (2) phase precipitated during cooling decreases with the increase of cooling rate. The retention of BCC phase was increased, the 尾 phase was disordered during furnace cooling, and the ordered B2 phase was obtained during oil cooling, only O phase was precipitated in the process of furnace cooling, and the properties of samples with different cooling rates were tested. It is found that the tensile strength at 650 鈩，
本文编号：2170293
[Abstract]:After solid solution of Ti-22Al-24Nb-0.5Mo alloy (mole fraction of%), four cooling rates of furnace cooling, air cooling, oil quenching and water quenching were used to cool the alloy to room temperature, and then the same aging treatment was carried out. The results of scanning electron microscopy (SEM) showed that air cooling was found. The microstructure obtained by oil cooling and water quenching is a two-state structure composed of 伪 -S _ 2 (equiaxed and needle-shaped) and fine O phase strips precipitated on B _ 2 / 尾 matrix, and it is found that the 伪 _ (2) phase precipitated during cooling decreases with the increase of cooling rate. The retention of BCC phase was increased, the 尾 phase was disordered during furnace cooling, and the ordered B2 phase was obtained during oil cooling, only O phase was precipitated in the process of furnace cooling, and the properties of samples with different cooling rates were tested. It is found that the tensile strength at 650 鈩，
本文编号：2170293
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