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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Microstructure and Environment on Static Crack Growth Resistance in Alloy 706
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Effect of Microstructure and Environment on Static Crack Growth Resistance in Alloy 706

机译：显微组织和环境对706合金静态裂纹扩展性的影响

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The relationship between thermo-mechanical processing, resultant microstructure, and mechanical properties has been of interest in the field of metallurgy for centuries. In this work, the effect of heat treatment on microstructure and key mechanical properties important for turbine rotor design has been investigated. Specifically, the tensile yield strength and crack growth resistance for a nickel-iron based superalloy 706 has been examined. Through a systematic study, a correlation was found between the processing parameters and the microstructure. Specifically, differences in grain boundary and grain interior precipitates were identified and correlated with processing conditions. Further, a strong relationship between microstructure and mechanical properties was identified. The type and orientation of grain boundary precipitates affect time-dependent crack propagation resistance, and the size and volume fraction of grain interior precipitates were correlated with tensile yield strength. It was also found that there is a strong environmental effect on time-dependent crack propagation resistance, and the sensitivity to environmental damage is microstructure dependent. Microstructures with η decorated grain boundaries were more resistant to environmental damage through oxygen embrittlement than microstructures with no η phase on the grain boundaries. An effort was made to explore the mechanisms of improving the time-dependent crack propagation resistance through thermo-mechanical processing, and several mechanisms were identified in both the environment-dependent and the environment-independent category. These mechanisms were ranked based on their contributions to crack propagation resistance.
机译：数百年来，热机械加工，最终的微观结构和机械性能之间的关系一直是冶金领域关注的问题。在这项工作中，研究了热处理对涡轮转子设计非常重要的微观结构和关键机械性能的影响。具体地，已经检查了镍-铁基超级合金706的拉伸屈服强度和抗裂纹扩展性。通过系统的研究，发现了加工参数和微观结构之间的相关性。具体而言，识别出晶界和晶粒内部沉淀物的差异并将其与加工条件相关联。此外，确定了微观结构和机械性能之间的密切关系。晶界析出物的类型和取向影响随时间变化的裂纹扩展阻力，并且晶粒内部析出物的尺寸和体积分数与拉伸屈服强度相关。还发现对随时间变化的裂纹扩展阻力具有强烈的环境影响，并且对环境破坏的敏感性与微结构有关。具有η装饰晶界的显微组织比在晶界上没有η相的显微组织更能抵抗氧脆引起的环境破坏。努力探索通过热机械加工提高随时间变化的裂纹扩展阻力的机制，并在与环境有关和与环境无关的类别中确定了几种机制。根据这些机制对裂纹扩展阻力的贡献对其进行排名。

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