粉末床熔合制备的IN718高温合金热处理后沿LAGBs有γ′非均匀析出

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-07-30 DOI:10.1016/j.scriptamat.2025.116898

Ramakrishna M , Divya K , Chandrasekhar S B , Suresh Koppoju , Rajesh Korla

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引用次数: 0

摘要

采用激光辅助粉末床熔融增材制造技术（PBF-AM）对IN718进行后处理后，在低角晶界（LAGBs）上观察到γ′′相包络层。在1030℃固溶1小时后，元素Nb在γ基体中重新分布，沿LAGBs形成低能位错结构，同时保留了原位晶粒结构。随后，双时效处理导致γ″沿lagb非均相析出，晶粒内均相析出。利用电子显微镜和3D原子探针观察以及Calphad模拟来了解每个阶段的微观结构，以创建导致几乎完全利用Nb形成γ″的途径，同时保留其构建结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Heterogeneous precipitation of γ′′ along LAGBs during post-heat treatment of powder bed fusion additively manufactured IN718 superalloy

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Heterogeneous precipitation of γ′′ along LAGBs during post-heat treatment of powder bed fusion additively manufactured IN718 superalloy

Envelop of γ′′ precipitates is observed along low angle grain boundaries (LAGBs) after post-process heat treatment of IN718 produced through laser assisted powder bed fusion additive manufacturing technique (PBF-AM). Solutionization of as-built IN718 at 1030 °C for 1 hr resulted in a redistribution of elemental Nb in the γ matrix and the formation of low energy dislocation structure along LAGBs while retaining the as-build grain structure. Subsequently, double aging treatment resulted in heterogeneous precipitation of γ″ along LAGBs with homogeneous precipitation within the grains. Electron microscopy and 3D atom probe observations along with Calphad simulations were used to understand the microstructure at each stage to create the pathway leading to near complete utilization of Nb for γ″ formation while retaining the as-build structure.

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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.