TY - JOUR
T1 - Hot cracking investigation during laser welding of high-strength steels with multi-scale modelling approach
AU - Gao, He
AU - Agarwal, G.
AU - Amirthalingam, M.
AU - Hermans, M. J.M.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
KW - advanced high-strength steel
KW - finite element model
KW - Hot cracking
KW - laser welding
KW - phase field model
UR - http://resolver.tudelft.nl/uuid:7269da70-7220-4013-9ccc-c7868d0fa248
UR - http://www.scopus.com/inward/record.url?scp=85030722516&partnerID=8YFLogxK
U2 - 10.1080/13621718.2017.1384884
DO - 10.1080/13621718.2017.1384884
M3 - Article
AN - SCOPUS:85030722516
SN - 1362-1718
VL - 23 (2018)
SP - 287
EP - 294
JO - Science and Technology of Welding and Joining
JF - Science and Technology of Welding and Joining
IS - 4
ER -