基于统计分析的镍基单晶高温合金最佳固溶热处理时间选择

Optimal Duration Selection of Solid Solution Heat Treatment of Ni-based Single Crystal Superalloys Based on Statistical Analysis

摘要:

提出了一种基于二代镍基单晶（SX）高温合金γ′相尺寸变化统计分析的SX高温合金固溶热处理最佳时间的选择方法。通过数值分析引入了微观结构均匀性ω，根据数据统计ω曲线可分为3个阶段：显著变化区、过渡区和稳态区。过渡区描述了固溶热处理时间选择的最佳范围。通过测量合金的γ′筏化和蠕变性能，验证了该方法的有效性。同时也通过第四代镍基SX高温合金验证了该方法的准确性。该方法能够有效地建立最优的热处理工艺，并为SX高温合金的设计和工程应用提供指导。

Abstract:

A novel approach was developed to select the optimal duration for solid solution heat treatment of Ni-based single-crystal (SX) superalloys based on the statistical analysis of γ′ phase size in the second-generation SX superalloys. The microstructure uniformity ω was introduced through the statistical analysis. The ω curves can be divided into three stages according to the statistical analysis: the significant change area, transition area, and steady state area. The transition area shows the optimal duration range for solution heat treatment of Ni-based SX superalloys. This approach was verified by measuring the γ′ rafting rate and testing the creep properties of alloys. Meanwhile, the accuracy of this approach was also validated through the fourth-generation Ni-based SX superalloys. This approach can effectively optimize the heat treatment and provide guidance for the design and engineering applications of SX superalloys.