A Microtexture-Microstructure Model to Simulate Intergranular Stress Corrosion Crack Propagation in Pipeline Steel

Boundary Character ◽

Electron backscattered diffraction (EBSD) investigations were carried out to obtain the microtexture, grain boundary character, and physical microstructural parameters, such as the grain size and grain shape distributions, of API X65 pipeline steel that experienced extensive intergranular stress corrosion cracking (IGSCC). The orientation distribution functions (ODF) and the grain boundary character distributions (GBCD) of the cracked and crack-arrest microstructures were obtained from the EBSD data of the corresponding regions. First, a Voronoi algorithm based microstructure reconstruction model has been utilized to generate model microstructure that resembles the experimentally observed ones. Subsequently, a Markov Chain–Monte Carlo model, coupled with the grain boundary character and orientation dependent vulnerability statistics, has been employed to simulate the crack propagation behavior. The simulation results are in good agreement with the experimental observations.

A new understanding of intergranular stress corrosion cracking resistance of pipeline steel through grain boundary character and crystallographic texture studies

Corrosion Science ◽

10.1016/j.corsci.2008.10.006 ◽

2009 ◽

Vol 51 (1) ◽

pp. 119-128 ◽

Cited By ~ 142

Author(s):

M.A. Arafin ◽

J.A. Szpunar

Keyword(s):

Grain Boundary ◽

Stress Corrosion ◽

Stress Corrosion Cracking ◽

Crystallographic Texture ◽

Pipeline Steel ◽

Corrosion Cracking ◽

Intergranular Stress Corrosion Cracking

Boundary Character ◽

Grain Boundary Character ◽

A novel microstructure – Grain boundary character based integrated modeling approach of intergranular stress corrosion crack propagation in polycrystalline materials

Computational Materials Science ◽

10.1016/j.commatsci.2009.11.020 ◽

2010 ◽

Vol 47 (4) ◽

pp. 890-900 ◽

Cited By ~ 15

Author(s):

M.A. Arafin ◽

J.A. Szpunar

Keyword(s):

Grain Boundary ◽

Crack Propagation ◽

Stress Corrosion ◽

Stress Corrosion Crack ◽

Integrated Modeling ◽

Polycrystalline Materials ◽

Boundary Character ◽

Modeling Approach ◽

Study of grain boundary character along intergranular stress corrosion crack paths in austenitic alloys

Acta Materialia ◽

10.1016/s1359-6454(01)00064-7 ◽

2001 ◽

Vol 49 (9) ◽

pp. 1589-1598 ◽

Cited By ~ 250

Author(s):

V.Y. Gertsman ◽

S.M. Bruemmer

Keyword(s):

Grain Boundary ◽

Stress Corrosion ◽

Stress Corrosion Crack ◽

Boundary Character ◽

Grain Boundary Character ◽

Austenitic Alloys ◽

Crack Paths

Stress Corrosion Cracks in Pipeline Steels

10.32545/encyclopedia201906.0002.v1 ◽

2019 ◽

Author(s):

Mohammad Ali Mohtadi Bonab

Keyword(s):

Grain Boundary ◽

Crack Propagation ◽

Grain Boundaries ◽

Stress Corrosion ◽

Coincidence Site Lattice ◽

Rolling Plane ◽

Pipeline Steels ◽

Factors Affecting ◽

Boundary Character ◽

The demand for pipeline steels has increased in the last several decades since they were able to provide an immune and economical way to carry oil and natural gas over long distances. There are two important damage modes in pipeline steels including stress corrosion cracking (SCC) and hydrogen induced cracking (HIC). The SCC cracks are those cracks which are induced due to the combined effects of a corrosive environment and sustained tensile stress. The present review article is an attempt to highlight important factors affecting the SCC in pipeline steels. Based on a literature survey, it is concluded that many factors, such as microstructure of steel, residual stresses, chemical Composition of steel, applied load, alternating current (AC) current and texture, and grain boundary character affect the SCC crack initiation and propagation in pipeline steels. It is also found that crystallographic texture plays a key role in crack propagation. Grain boundaries associated with {111}//rolling plane, {110}//rolling plane, coincidence site lattice boundaries and low angle grain boundaries are recognized as crack resistant paths while grains with high angle grain boundaries provide easy path for the SCC intergranular crack propagation. Finally, the SCC resistance in pipeline steels is improved by modifying the microstructure of steel or controlling the texture and grain boundary character.

Effects of Different Parameters on Initiation and Propagation of Stress Corrosion Cracks in Pipeline Steels: A Review

Metals ◽

10.3390/met9050590 ◽

2019 ◽

Vol 9 (5) ◽

pp. 590 ◽

Cited By ~ 7

Author(s):

M.A. Mohtadi-Bonab

Keyword(s):

Grain Boundary ◽

Crack Propagation ◽

Grain Boundaries ◽

Stress Corrosion ◽

Coincidence Site Lattice ◽

Rolling Plane ◽

Pipeline Steels ◽

Boundary Character ◽

Grain Boundary Character ◽

Initiation And Propagation

The demand for pipeline steels has increased in the last several decades since they were able to provide an immune and economical way to carry oil and natural gas over long distances. There are two important damage modes in pipeline steels including stress corrosion cracking (SCC) and hydrogen induced cracking (HIC). The SCC cracks are those cracks which are induced due to the combined effects of a corrosive environment and sustained tensile stress. The present review article is an attempt to highlight important factors affecting the SCC in pipeline steels. Based on a literature survey, it is concluded that many factors, such as microstructure of steel, residual stresses, chemical composition of steel, applied load, alternating current (AC) current and texture, and grain boundary character affect the SCC crack initiation and propagation in pipeline steels. It is also found that crystallographic texture plays a key role in crack propagation. Grain boundaries associated with {111}∥rolling plane, {110}∥rolling plane, coincidence site lattice boundaries and low angle grain boundaries are recognized as crack resistant paths while grains with high angle grain boundaries provide easy path for the SCC intergranular crack propagation. Finally, the SCC resistance in pipeline steels is improved by modifying the microstructure of steel or controlling the texture and grain boundary character.

Statistical Analysis of Boundaries in NiO Films Grown on Ni Single Crystals

MRS Proceedings ◽

10.1557/proc-472-119 ◽

1997 ◽

Vol 472 ◽

Author(s):

A. P. Zhilyaev ◽

Hualong Li ◽

F. Czerwinski ◽

J.A. Szpunar

Keyword(s):

Statistical Analysis ◽

Grain Boundary ◽

Growth Parameters ◽

Orientation Distribution ◽

Ionic Species ◽

Distribution Functions ◽

Grain Boundary Character Distribution ◽

Boundary Misorientation ◽

Boundary Character ◽

ABSTRACTAn attempt was made to apply the statistical analysis of NiO grain boundaries to explain the dependence of NiO growth kinetics on the crystallographic orientation of Ni substrate. Study was conducted for two crystals faces of Ni, (100) and (111), which exhibits a difference in oxidation rate constants at 1073 K, over one order of magnitude. The orientation distribution functions (ODF), calculated from X-ray measurements for NiO grown on both Ni faces, were analyzed numerically to assess the grain boundary character. The grain boundary misorientation distribution (GBMD) and grain boundary character distribution (GBCD), used to describe oxide structure, were derived using three different assumptions regarding the spatial correlation in orientation of neighbouring grains. Grain boundary network was created to analyze the high temperature diffusion properties through the oxide using diffusion constants available in the literature under assumption of various contribution of bulk and grain boundary diffusion paths to overall transport of ionic species. The growth parameters obtained were finally verified by comparison with experimentally measured oxidation kinetics.