Liquid-induced healing of cracks in nickel-based superalloy fabricated by laser powder bed fusion

Hu，Xiaogang1,2; Guo，Chuan1,3; Huang，Yuhe4; Xu，Zhen1; Shi，Zhifang1; Zhou，Fan2; Li，Gan1,3; Zhou，Yang1,2; Li，Yu1; Li，Zhuoyu1; Li，Zhong1,2; Lu，Hongxing1; Ding，Hui5; Dong，Hongbiao6; Zhu，Qiang1,2

2024-04-01

10.1016/j.actamat.2024.119731

Acta Materialia   影响因子和分区

1359-6454

Despite being recognized as a disruptive technology, laser powder bed fusion additive manufacturing has not yet achieved the widespread commercial application envisioned in its early stage. One of the most critical challenges is the cracking issue that limits the printability of most existing engineering alloys. Here we report a liquid-induced healing (LIH) post-process that enables complete healing of those microcracks by inducing the solid-liquid phase transition at the cracking regions, resulting in enhanced mechanical properties. Specifically, we adopted In738LC alloy prepared by laser powder bed fusion as the demonstration material to reveal the mechanisms of remelted liquid fraction and isostatic pressure during the crack healing processing. The effects of LIH treatment on mechanical properties and microstructural evolution were also investigated. Compared with the existing solutions for crack elimination (e.g., shortening the solidification range, promoting equiaxed grains, reducing thermal stress, and hot isostatic pressing), our strategy exhibits superiorities in terms of crack healing efficacy, operation complexity, and process cost. LIH shows promise as a routinized and guaranteed process integrated with additive manufacturing, bypassing the technical barriers to completely crack-free printing and thus immediately promoting the industrial application of the alloys hindered by the cracking issue.

Healing Hot cracking Laser powder bed fusion Micro-remelting

SCI ; EI

英语

第一 ; 通讯

MATERIALS SCIENCE

2-s2.0-85184517601

Scopus

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,Shenzhen,518055,China
3.CityU-Shenzhen Futian Research Institute,Shenzhen,518045,China
4.Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing,100083,China
5.School of Materials Science and Engineering,Southeast University,Nanjing,211189,China
6.School of Engineering,University of Leicester,Leicester,LEI 7RH,United Kingdom

Hu，Xiaogang,Guo，Chuan,Huang，Yuhe,et al. Liquid-induced healing of cracks in nickel-based superalloy fabricated by laser powder bed fusion[J]. Acta Materialia,2024,267.

Hu，Xiaogang.,Guo，Chuan.,Huang，Yuhe.,Xu，Zhen.,Shi，Zhifang.,...&Zhu，Qiang.(2024).Liquid-induced healing of cracks in nickel-based superalloy fabricated by laser powder bed fusion.Acta Materialia,267.

Hu，Xiaogang,et al."Liquid-induced healing of cracks in nickel-based superalloy fabricated by laser powder bed fusion".Acta Materialia 267(2024).