Hot cracking investigation during laser welding of high-strength steels with multi-scale modelling approach

He Gao, G. Agarwal, M. Amirthalingam, M. J.M. Hermans

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
218 Downloads (Pure)

Abstract

Hot cracking during laser welding of advanced high-strength steels is reported to be a serious problem by automotive manufacturers. In this work, hot cracking susceptibilities of transformation-induced plasticity (TRIP) and dual-phase (DP) steels are studied based on a multi-scale modelling approach. Transient temperatures measured from welding experiments are used to validate a finite element (FE) model. The temperature, thermal gradient and cooling rate in the weld fusion zone are extracted from the FE model and pre-defined as boundary conditions to a phase field model. The welding-induced microstructural evolution is simulated considering thermodynamic and mobility data. Results show that, compared to the DP steel, the TRIP steel has a broader solidification range, a greater pressure drop at the inter-dendritic regions, and an increased phosphorus segregation at the grain boundaries; all these make this steel more susceptible for hot cracking.

Original languageEnglish
Pages (from-to)287-294
JournalScience and Technology of Welding and Joining
Volume23 (2018)
Issue number4
DOIs
Publication statusPublished - 2017

Keywords

  • advanced high-strength steel
  • finite element model
  • Hot cracking
  • laser welding
  • phase field model

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