High-strength yet hydrogen embrittlement-resistant laser powder bed fusion Inconel 718 alloy through heat treatment

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-07-23 DOI:10.1016/j.corsci.2025.113208

Kunjie Dai , Xing He , Decheng Kong , Reynier I. Revilla , Yucheng Ji , Tianle Liu , Wei Zhang , Anqing Fu , Chaofang Dong

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Abstract

Hydrogen embrittlement (HE) stands out as a critical challenge for 3D-printed metals and alloys, which inherently exhibit high strength due to their refined microstructures formed during rapid solidification. In this work, we systematically investigate the HE characteristics of the Inconel 718 alloy fabricated by laser powder bed fusion (LPBF) through microstructural engineering employing a two-step solid solution heat treatment process (1050 ℃/1 h + 980 ℃/1 h) followed by conventional aging. The optimized heat-treated LPBF Inconel 718 achieves an exceptional balance of high strength (∼1363 MPa ultimate tensile strength) and HE resistance, attributable to the formation of annealing twins, γ''/γ' precipitation, and recrystallization. Concurrently, low-index grains with precipitates formed at the boundaries shifted the cracking failure mode from intergranular to transgranular, thereby mitigating hydrogen-induced ductility loss. This research provides valuable insights into microstructural tailoring via heat treatment design to simultaneously enhance both strength and HE resistance for LPBF nickel-based superalloys.

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高强度抗氢脆激光粉末床熔合Inconel 718合金通过热处理

氢脆（HE）是3d打印金属和合金面临的一个关键挑战，这些金属和合金由于在快速凝固过程中形成的精细微观结构而具有高强度。采用两步固溶热处理工艺（1050℃/1 h + 980℃/1 h），再进行常规时效处理，通过显微组织工程系统地研究了激光粉末床熔合法制备的Inconel 718合金的HE特性。经过优化的热处理LPBF Inconel 718实现了高强度（~ 1363 MPa极限抗拉强度）和抗HE性能的卓越平衡，这是由于退火孪晶的形成、γ“/γ”析出和再结晶。同时，低指数晶粒在边界处形成析出相，使裂纹破坏模式由晶间转变为穿晶，从而减轻了氢致延性损失。该研究为通过热处理设计来定制微结构提供了有价值的见解，同时提高了LPBF镍基高温合金的强度和抗HE性。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.