A method for increasing the supersolvus critical strain for recrystallization in single-crystal superalloys

IF 8.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Research Letters Pub Date : 2023-09-04 DOI:10.1080/21663831.2023.2253267

Sicong Lin, Kai Chen, Qiang Zeng, U. Ramamurty

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Abstract

Recrystallization, possibly triggered during heat treatments by plastic strains of only 1–2%, is highly deleterious to Ni-based single-crystal superalloys. Herein, we successfully recover plastic deformation and enhance the supersolvus critical strain for recrystallization by ramping the annealing temperature slowly from 1100 °C to γ′-solvus point. This preempts recrystallization during the subsequent supersolvus solutionizing treatment. The proposed method is validated in single-crystals compressed to 5.9% plastic strain at room temperature. After supersolvus solutionizing, an almost dislocation-free single-crystal with uniformly distributed γ′-precipitates is obtained. The proposed method offers a practical means to bring down the overall expenses of single-crystal turbine blades. GRAPHICAL ABSTRACT IMPACT STATEMENT An optimized pre-solutionizing recovery heat treatment can elevate the critical plastic strain value for recrystallization in Ni-based superalloy single-crystals to 3 times higher than previously established.

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提高单晶高温合金再结晶超溶质临界应变的方法

再结晶对镍基单晶高温合金非常有害，可能在热处理过程中仅由1-2%的塑性应变触发。通过将退火温度从1100℃缓慢升高到γ′溶点，我们成功地恢复了塑性变形，并提高了再结晶的超溶剂临界应变。这可以防止在随后的超溶剂固溶处理过程中再结晶。该方法在单晶压缩至5.9%塑性应变的室温条件下得到了验证。经超溶剂固溶后，得到了几乎无位错的单晶，其γ′析出相分布均匀。该方法为降低单晶涡轮叶片的总体成本提供了一种实用的方法。优化后的预固溶恢复热处理可将ni基高温合金单晶再结晶的临界塑性应变值提高到原来的3倍。

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来源期刊

Materials Research Letters Materials Science-General Materials Science

CiteScore

12.10

自引率

3.60%

发文量

审稿时长

3.3 months

期刊介绍： Materials Research Letters is a high impact, open access journal that focuses on the engineering and technology of materials, materials physics and chemistry, and novel and emergent materials. It supports the materials research community by publishing original and compelling research work. The journal provides fast communications on cutting-edge materials research findings, with a primary focus on advanced metallic materials and physical metallurgy. It also considers other materials such as intermetallics, ceramics, and nanocomposites. Materials Research Letters publishes papers with significant breakthroughs in materials science, including research on unprecedented mechanical and functional properties, mechanisms for processing and formation of novel microstructures (including nanostructures, heterostructures, and hierarchical structures), and the mechanisms, physics, and chemistry responsible for the observed mechanical and functional behaviors of advanced materials. The journal accepts original research articles, original letters, perspective pieces presenting provocative and visionary opinions and views, and brief overviews of critical issues.