Integrated Modelling of Microstructure Evolution and Mechanical Properties Prediction for Q&P Hot Stamping Process of Ultra-High Strength Steel

High strength steel products with good ductility can be produced via Q&P hot stamping process, while the phase transformation of the process is more complicated than common hot stamping since two-step quenching and one-step carbon partitioning processes are involved. In this study, an integrated...

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Bibliographic Details
Published in:Chinese journal of mechanical engineering 2020-12, Vol.33 (1), Article 45
Main Authors: Chen, Yang, Zhang, Huizhen, Tang, Johnston Jackie, Han, Xianhong, Cui, Zhenshan
Format: Article
Language:English
Subjects:
Carbon
Electrical Machines and Networks
Electronics and Microelectronics
Elongation
Engineering
Engineering Thermodynamics
Evolution
Finite element method
Grain size
Heat and Mass Transfer
Heat treating
High strength steel
High strength steels
Hot stamping
Instrumentation
Interrupted quenching
Machines
Manufacturing
Martensite
Martensitic transformations
Mechanical Engineering
Mechanical properties
Microstructure
Original Article
Partitioning
Phase transitions
Power Electronics
Prediction models
Processes
Smart Material
Steel products
Theoretical and Applied Mechanics
Transformation temperature
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Summary:High strength steel products with good ductility can be produced via Q&P hot stamping process, while the phase transformation of the process is more complicated than common hot stamping since two-step quenching and one-step carbon partitioning processes are involved. In this study, an integrated model of microstructure evolution relating to Q&P hot stamping was presented with a persuasively predicted results of mechanical properties. The transformation of diffusional phase and non-diffusional phase, including original austenite grain size individually, were considered, as well as the carbon partitioning process which affects the secondary martensite transformation temperature and the subsequent phase transformations. Afterwards, the mechanical properties including hardness, strength, and elongation were calculated through a series of theoretical and empirical models in accordance with phase contents. Especially, a modified elongation prediction model was generated ultimately with higher accuracy than the existed Mileiko’s model. In the end, the unified model was applied to simulate the Q&P hot stamping process of a U-cup part based on the finite element software LS-DYNA, where the calculated outputs were coincident with the measured consequences.
ISSN:1000-9345
2192-8258
DOI:10.1186/s10033-020-00461-3