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首页> 外文期刊>Materials Science and Engineering >A study of solution cooling rate on γ' precipitate and hardness of a polycrystalline Ni-based superalloy using a high-throughput methodology
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A study of solution cooling rate on γ' precipitate and hardness of a polycrystalline Ni-based superalloy using a high-throughput methodology

机译：使用高通量方法研究溶液冷却速率对多晶镍基高温合金γ'析出物和硬度的影响

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摘要

In powder metallurgy Ni-based superalloys, the mechanical properties such as strength, creep and fatigue resistance at the elevated temperature closely rely on the solution cooling rate during heat treatment. Understanding the precipitation mechanisms upon different quenching media can offer a bridge across cooling rate to mechanical response. To date, extensive works have been done to construct the relationship between cooling rate and mechanical performance only using a limited quantity of quenching media such as water, oil and air, resulting in the inadequacy of process-microstructure-property database. In this work, a high-throughput approach based on the Jominy end quenching technique was developed to produce a gradient distribution of gamma' precipitates within an individual specimen by introducing a wide range of cooling rates from 35 degrees C/min to 6346 degrees C/min. A transformation from unimodal to bimodal gamma' Particle Size Distribution (PSD) was observed along the end quenched specimen. The average size of gamma' precipitates is inversely proportional with cooling rate in logarithmic scale. The hardness measurements display a strong dependence on cooling rate, which is explained by phase field simulation to provide deeper insight into the interaction between dislocation and gamma' precipitates.
机译：在粉末冶金镍基高温合金中，高温下的机械性能（例如强度，蠕变和抗疲劳性）紧密依赖于热处理过程中的溶液冷却速率。了解不同淬火介质上的沉淀机理可以为冷却速率与机械响应之间的桥梁提供桥梁。迄今为止，已经进行了大量工作来构造冷却速率与机械性能之间的关系，仅使用有限数量的淬火介质（例如水，油和空气），从而导致工艺-微结构-性能数据库不足。在这项工作中，开发了一种基于Jominy末端淬灭技术的高通量方法，通过引入从35℃/ min到6346℃/ min的宽范围冷却速率，在单个样品中产生gamma'沉淀物的梯度分布。分钟沿末端淬火样品观察到了从单峰到双峰伽马的粒度分布（PSD）的转变。 γ'沉淀物的平均大小与冷却速率成对数比例成反比。硬度测量值显示出对冷却速率的强烈依赖性，这可以通过相场模拟来解释，以更深入地了解位错与γ'沉淀之间的相互作用。

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