Chinese Journal of Mechanical Engineering >

2020 , Vol. 33 >Issue 3: 45 - 45

DOI: https://doi.org/10.1186/s10033-020-00461-3

Smart Materials

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

  • Yang Chen ,
  • Huizhen Zhang ,
  • Johnston Jackie Tang ,
  • Xianhong Han ,
  • Zhenshan Cui
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  • 1. Institute of Forming Technology & Equipment, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China;
    2. National Engineering Research Center of Die and Mold CAD, Shanghai Jiao Tong University, Shanghai, 200030, China

收稿日期: 2019-08-06

  修回日期: 2020-04-29

  网络出版日期: 2020-08-01

基金资助

Supported by National Natural Science Foundation of China(Grant Nos.51775336, U1564203), and Program of Shanghai Academic Research Leadership (Grant No.19XD1401900)

收起

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

  • Yang Chen ,
  • Huizhen Zhang ,
  • Johnston Jackie Tang ,
  • Xianhong Han ,
  • Zhenshan Cui
Expand
  • 1. Institute of Forming Technology & Equipment, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China;
    2. National Engineering Research Center of Die and Mold CAD, Shanghai Jiao Tong University, Shanghai, 200030, China

Received date: 2019-08-06

  Revised date: 2020-04-29

  Online published: 2020-08-01

Supported by

Supported by National Natural Science Foundation of China(Grant Nos.51775336, U1564203), and Program of Shanghai Academic Research Leadership (Grant No.19XD1401900)

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摘要

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.

关键词： Q & P hot stamping; Phase transformation model; Microstructure evolution; Product properties prediction

本文引用格式

Yang Chen , Huizhen Zhang , Johnston Jackie Tang , Xianhong Han , Zhenshan Cui . Integrated Modelling of Microstructure Evolution and Mechanical Properties Prediction for Q & P Hot Stamping Process of Ultra-High Strength Steel[J]. Chinese Journal of Mechanical Engineering, 2020 , 33(3) : 45 -45 . DOI: 10.1186/s10033-020-00461-3

Abstract

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.

Key words： Q & P hot stamping; Phase transformation model; Microstructure evolution; Product properties prediction

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