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研究了具有[001]、[011]和[111]取向以及[001]附近取向的DD407单晶高温合金经过热处理后,在760℃温度下的拉伸性能。结果表明,该合金具有明显的拉伸性能各向异性:[001]取向上表现出了最高的屈服强度和抗拉强度;当取向逐渐偏离[001]时,强度开始降低,但在相同的偏离角度内,偏向[111]取向的试样具有比偏向[011]取向的试样高的拉伸性能;[011]取向表现出了最低的抗拉强度和伸长率;[111]取向表现出了最高的断后伸长率。[001]取向、[011]取向以及[001]取向附近的试样,变形机制为八面体滑移,其中[001]取向和[001]取向附近偏向[111]的试样均表现出了明显的双滑移;[111]取向试样变形时启动了立方滑移系。双滑移系的启动导致了[001]取向具有高于[011]取向的抗拉强度和伸长率。立方滑移的均匀性导致了[111]取向上高的伸长率。
The tensile properties of DD407 single crystal superalloy with [001], [011] and [111] orientations and near [001] orientation after heat treatment at 760 ℃ were investigated. The results show that the alloy has obvious tensile anisotropy: [001] shows the highest yield strength and tensile strength; when the orientation deviates gradually from [001], the strength begins to decrease, but in the same deviation Angle [111] orientation had higher tensile properties than the specimens oriented toward [011] orientation; [011] orientation exhibited the lowest tensile strength and elongation; [111] orientation exhibited The highest elongation after break. The samples with [001] orientation, [011] orientation and [001] orientation show octahedron slippage, and the samples with [001] orientation and [111] orientation near [001] Of the double slip; [111] oriented specimen deformation cubic slip system was activated. Activation of the double slip system results in tensile strength and elongation of the [001] orientation being higher than the [011] orientation. The uniformity of cubic slippage leads to high elongation in [111] orientation.