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A dislocation mechanics constitutive model for effects of welding-induced microstructural transformation on cyclic plasticity and low-cycle fatigue for X100Q bainitic steel
- Publication Year :
- 2020
- Publisher :
- Elsevier, 2020.
-
Abstract
- This paper presents a physically-based cyclic viscoplasticity model to capture the influence of welding-induced microstructural transformation on the fatigue response of the bainitic high-strength low-alloy steel, X100Q. The model incorporates the strengthening effects of dislocations, microstructural boundaries and precipitates, and the softening effects of microstructural degradation and early-life fatigue damage on yield strength and nonlinear cyclic-plastic response. The model is applied to predict the constitutive responses of X100Q parent material, physically-simulated intercritical heat affected zone (HAZ) and fine-grained HAZ, based on differences in bainitic hierarchical microstructure between the materials. A refined bainitic block structure is shown to be the primary microstructural feature contributing to monotonic and cyclic strength in the materials, whereas dislocation annihilation and the concomitant coarsening of the bainitic lath structure with cyclic-plastic deformation leads to cyclic softening behaviour. This publication has emanated from research conducted the financial support of Science Foundation Ireland as part of the MECHANNICS joint project between NUI Galway and University of Limerick under grant number SFI/14/IA/2604 and the I-Form Advanced Manufacturing Research Centre under grant number SFI/16/RC/3872. peer-reviewed
- Subjects :
- Heat-affected zone
Materials science
Bainite
02 engineering and technology
Welding
Lath
engineering.material
Industrial and Manufacturing Engineering
law.invention
0203 mechanical engineering
law
General Materials Science
Composite material
Softening
Microstructure
Fatigue
Viscoplasticity
Cyclic plasticity
Mechanical Engineering
021001 nanoscience & nanotechnology
020303 mechanical engineering & transports
Mechanics of Materials
Modeling and Simulation
engineering
Deformation (engineering)
Dislocation
0210 nano-technology
Heat affected zone
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....1fd2e0312f0930668f0759881b47362a