High-temperature deformation of Ni-based superalloy and recrystallization prevention by recovery

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-04-30 DOI:10.1016/j.scriptamat.2025.116732

Hongfei Zhang , Kai Chen , Wolfgang Pantleon , Hao Shen , Evan Ma

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Abstract

Achieving high recoverability is essential to maintaining the structural integrity for Ni-based superalloy single crystals. However, the recovery and recrystallization mechanisms in Ni-based superalloys after high-temperature deformation are still discussed controversially. This study reveals that for plastic strains of up to 3.2 %, dislocations carry plasticity in superalloy single crystals compressed at high temperatures, and that both dislocations as well as superlattice stacking faults can be easily annealed out by recovery treatment to preempt recrystallization. This means that the recoverability of Ni-based superalloy single crystals can be increased by more than twice compared to previous reports. For larger plastic strains, deformation twins form. They block moving dislocations which assemble in new boundaries that eventually trigger dynamic recrystallization. Upon subsequent heat treatment, such newly recrystallized grains grow rapidly further, resulting in a coarse polycrystalline microstructure. Consequently, avoiding deformation twins becomes the key to maintaining the single-crystalline microstructure.

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镍基高温合金的高温变形及回收防止再结晶

实现高可恢复性是保持镍基高温合金单晶结构完整性的关键。然而，镍基高温合金高温变形后的恢复和再结晶机理仍存在争议。研究结果表明，当塑性应变高达3.2%时，高温合金单晶的位错具有塑性，并且位错和超晶格层错都可以通过恢复处理很容易地退火以防止再结晶。这意味着镍基高温合金单晶的可恢复性比以前的报道提高了两倍以上。对于较大的塑性应变，形成变形孪晶。它们阻止在新边界中聚集的移动位错，最终触发动态再结晶。在随后的热处理中，这些新再结晶的晶粒进一步迅速长大，形成粗糙的多晶微观结构。因此，避免变形孪晶成为保持单晶组织的关键。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.