Boron-induced unique precipitation behavior at the grain boundary and its effect on the brittle fracture in a Fe-Mn-Al-C-based austenitic lightweight alloy

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

Scripta Materialia Pub Date : 2025-01-22 DOI:10.1016/j.scriptamat.2025.116574

Dongwon Lee , T.T.T. Trang , Dong-Hyun Kim , Gun-Young Yoon , Seong-Jun Park , Jae Sang Lee , Yoon-Uk Heo

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Abstract

Boron-induced unique precipitation behavior at the grain boundary (GB) and its effect on the brittle fracture were studied in a Fe–Mn–Al–C austenitic lightweight alloy. Adding 50 ppm wt.% of B promoted the GB segregation of boron at the early aging stage at 550 °C. The segregated boron forms the M₂₃B₆ at the GBs during further aging treatment. The initial M₂₃B₆ evolves the M₂₃C₆ by the replacement of boron to carbon during prolonged aging. Meanwhile, the M₂₃B₆ promotes the catalytic reaction that sequential formation of α-ferrite and κ-carbide, which results in the accelerated coverage of the GB cellular precipitates. The ductility of the alloy drops faster by cracking of GB α-ferrite and κ-carbide under the applied stress as the cellular precipitate covers the GB. This study provides new insights into the role of boron addition between the GB strengthener and the embrittler in a Fe–Mn–Al–C austenitic lightweight steel.

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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.