Crystal Plasticity Modeling of Tension Process of QP980 Steel

doi:10.16183/j.cnki.jsjtu.2020.391

Abstract

Abstract:

The mechanical behavior of the quenching and partitioning 980 (QP980) steel is affected by martensitic transformation during deformation. The microstructure of QP980 steel before and after deformation is characterized by using the electron backscattered diffraction (EBSD) method. An elastic visco-plastic self-consistent (EVPSC) polycrystalline model considering phase transformation is established based on the phenomenological theory of martensite crystallography (PTMC). The macroscopic flow stress as well as texture evolution of QP980 steel during uniaxial tension process is reproduced by the model. The material consists of ferrite (F), martensite, and retained austenite (RA) with rolling texture in the initial state. After deformation, the content of RA decreases and the <111> fiber of the RA, the <110> fiber of the ferrite and martensite along the tensile direction are enhanced. Phase transformation enhances the strength and work hardening rate but has little effect on the texture evolution. According to the distribution of stress and strain during the calculation of deformation, ferrite and tempered martensite (TM) contribute most to the deformation, and the new martensite (NM) is the most probable nucleation sites of fracture due to its highest average stress.

Key words: quenching and partitioning (QP) steel, crystal plasticity, martensitic transformation, elastic visco-plastic self-consistent (EVPSC)

CLC Number:

YANG Hao, WANG Huamiao, LI Dayong. Crystal Plasticity Modeling of Tension Process of QP980 Steel[J]. Journal of Shanghai Jiao Tong University, 2021, 55(11): 1476-1482.

Figures/Tables 6

Fig.1

Tab.1

Hardening parameters of constituent phases and transformation parameters of austenitic phase

相	滑移系	$τ α 0$ /MPa	$τ α 1$ /MPa	$θ α 0$ /MPa	$θ α 1$ /MPa	β₁	β₂	β₃
奥氏体	{111}<110>	240	1	800	20	6.26	0.57	2
铁素体	{110}<111>+{112}<111>	190	150	1200	150
回火马氏体	{110}<111>+{112}<111>	390	50	600	50
新生马氏体	{110}<111>+{112}<111>	450	40	2500	2200

Tab.1

Fig.2

Fig.3

Fig.4

Fig.5

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