Selective Anisotropy of Mechanical Properties in Inconel718 Alloy.

Selective Anisotropy of Mechanical Properties in Inconel718 Alloy.
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Inconel718合金力学性能的选择性各向异性

DOI:
10.3390/ma14143869
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发表时间:
2021-07-11
期刊:
Materials (Basel, Switzerland)
影响因子:
--
通讯作者:
Li W
Li W
中科院分区:
其他
文献类型:
--
作者:
Liang Y;Ma J;Zhou B;Li W

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研究了在各种固溶和时效处理过程中产生的具有弦状δ相和碳化物的Inconel718轻微轧制合金的机械各向异性行为。在 650 °C时,强度和断裂性能的各向异性较弱,而延展性,即减薄面积(RA)和冲击韧性(CVN)则呈现出良好的各向异性。MC 碳化物促进了滑移系统的运行,因此有利于削弱强度各向异性。RA 各向异性主要源于高密度的 δ 相颗粒,它们提供了更多的裂纹成核点,并由于轧制方向上微裂纹之间的桥距较短而刺激了裂纹的快速扩展。相比之下,在较低的固溶温度(940 °C)下,CVN 各向异性来自 δ 相和碳化物,但在 980 °C(δ 相完全溶解)下,CVN 各向异性仅取决于碳化物。除了在室温下运行的位错运动外,激活的晶界过程也是造成高温下断裂性能各向异性较弱的原因。这项研究为 Inconel718 合金热加工工艺的技术应用提供了指导。
Mechanical anisotropy behaviors are investigated in slightly rolled Inconel718 alloy with string-like δ phase and carbides produced during various solid-solution and aging treatments. A weak anisotropy in the strengths and rupture properties at 650 °C is visible, whereas ductility, i.e., reduction in area (RA) and impact toughness (CVN), presents a sound anisotropy behavior. MC carbides promote the operation of slip systems and thus are conducive to weakening the strength anisotropy. The RA anisotropy mainly stems from high-density δ phase particles that provide more crack nucleation sites and stimulate rapid propagation because of the shorter bridge distance between micro-cracks at the rolling direction. In contrast, CVN anisotropy arises from both δ phase and carbides at a lower solid-solution temperature of 940 °C but only depends on carbides at 980 °C where the δ phase fully dissolves. Apart from dislocation motions operated at room temperature, the activated grain boundary processes are responsible for the weak anisotropy of rupture properties at the elevated temperature. This work provides a guideline for technological applications in the hot working processes for Inconel718 alloys.
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