Abstract
Elastic-plastic deformation behavior of austenitic, martensitic, and austenitic-martensitic high-Mn steels is investigated by using crystal plasticity theory. The development of expandable pipes made of two-phase steel for oil and gas well applications is needed for improved and efficient recovery of hydrocarbons from difficult reservoirs. The current research is aimed at improving the down-hole post-expansion material properties of expandable pipes. A mathematical model is first developed based on finite-deformation crystal plasticity theory assuming that slip is the prime mode of plastic deformation. The developed model is then numerically implemented by using the finite element software ABAQUS, through a user defined subroutine. Finite element simulations are performed for austenitic, martensitic, and austenitic-martensitic steels having different proportions of martensite in an austenite matrix. Three primary modes of loading are considered: uniaxial tension, compression and simple shear. The variation in yield strength, hardening pattern and dissipated energy is observed and analyzed.
Highlights
As recoverable hydrocarbon resources are depleting, the oil and gas industry focuses more on exploring oil and gas from ultra-deep, tight and pocketed reservoirs
Compression, and simple shear simulations have been performed in order to estimate the deformation behavior of steel with varying volume fraction of austenite and martensite phases
The simulations have been done for dual-phase steel having 5, 10, 15, 20, 25, and 50 percent of martensite
Summary
As recoverable hydrocarbon resources are depleting, the oil and gas industry focuses more on exploring oil and gas from ultra-deep, tight and pocketed reservoirs. There is a significant demand for new metallic materials for well drilling and construction that can meet stringent requirements regarding operation in sub-surface environment, elevated strength, immunity to sulphur cracking, and light in weight. One of the new applications in well drilling and remediation is expandable pipes, requiring the development of modern steels. Different types of MT models are developed which span from single to polycrystalline, atomic to continuum, and microscopic to macroscopic [7] Whether these models are simple or complex, one solution approach is based on the finite element method (FEM). Crystal plasticity theory based on finite element formulation is used to predict the deformation behavior of dual-phase high-Mn steel. Finite element simulations are performed to analyze the stress-strain behavior of high-Mn steel having different percentage of austenite and martensite
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