Surface morphology evolution of GTD-450 stainless steel during laser powder bed fusion

Jiabao Hao, Lei Wei, Haiou Yang, Ting Bao, Fan Zhou, Yimin Cui, Xin Lin, Weidong Huang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

GTD-450 is a new type of maraging stainless steel. It has a wide application prospect in the additive manufacturing of complex components such as GTD-450 compressor blades using L-PBF technology. In this study, a multi-scale numerical model was used to simulate the whole process of L-PBF forming of GTD-450 stainless steel block. This numerical model can describe the evolution process of L-PBF forming temperature field, melt flow field and melt free surface. With the help of simulation results, the surface morphology of GTD-450 stainless steel formed under different layers is clarified. The experimental and numerical data of surface morphology are in good agreement, which verifies the reliability of the numerical model. Based on the experimental results, the influence mechanism of melt pool behaviour and thermal history on melt solidification behaviour was discussed, and the development process of L-PBF block surface morphology under the influence of melt pool behaviour was explained.

Original languageEnglish
Article number112107
JournalVacuum
Volume213
DOIs
StatePublished - Jul 2023

Keywords

  • Additive manufacturing
  • GTD-450 stainless steel
  • Laser powder bed fusion
  • Multi-scale numerical model
  • Surface morphology

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