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首页> 外文期刊>Metals >Evolution of the Annealing Twin Density during δ-Supersolvus Grain Growth in the Nickel-Based Superalloy Inconel? 718
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Evolution of the Annealing Twin Density during δ-Supersolvus Grain Growth in the Nickel-Based Superalloy Inconel? 718

机译：镍基高温合金Inconelδ-超溶剂晶粒生长过程中退火双密度的演变？ 718

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摘要

Grain growth experiments were performed on Inconel? 718 to investigate the possible correlation of the annealing twin density with grain size and with annealing temperature. Those experiments were conducted at different temperatures in the δ supersolvus domain and under such conditions that only capillarity forces were involved in the grain boundary migration process. In the investigated range, there is a strong inverse correlation of the twin density with the average grain size. On the other hand, the twin density at a given average grain size is not sensitive to annealing temperature. Consistent with previous results for pure nickel, the twin density evolution in Inconel? 718 is likely to be mainly controlled by the propagation of the pre-existing twins of the growing grains; i.e. , the largest ones of the initial microstructure. Almost no new twin boundaries are created during the grain growth process itself. Therefore, the twin density at a given average grain size is mainly dependent on the twin density in the largest grains of the initial microstructure and independent of the temperature at which grains grow. Based on the observations, a mean field model is proposed to predict annealing twin density as a function of grain size during grain growth.
机译：在Inconel？上进行晶粒长大实验718，以研究退火孪晶密度与晶粒尺寸和退火温度的可能关系。这些实验是在δ超固溶域中的不同温度下进行的，并且在仅毛细作用力参与晶界迁移过程的条件下进行了这些实验。在研究范围内，孪晶密度与平均晶粒尺寸呈强反相关。另一方面，在给定的平均晶粒尺寸下的孪晶密度对退火温度不敏感。与以前的纯镍结果一致，Inconel中的双密度演化？ 718可能主要由生长中的谷物的先前双生子的繁殖所控制;即最大的初始微观结构。在晶粒生长过程中，几乎没有新的孪生边界产生。因此，在给定的平均晶粒尺寸下的孪晶密度主要取决于初始微观结构的最大晶粒中的孪晶密度，并且与晶粒生长的温度无关。基于这些观察结果，提出了一种平均场模型来预测晶粒长大过程中退火双晶密度与晶粒尺寸的关系。

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