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Stress Corrosion Cracking of Austenitic Stainless Steel Rebar in Simulated Concrete Pore Solution Influenced by Strain-Induced Martensitic Transformation.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Stress Corrosion Cracking of Austenitic Stainless Steel Rebar in Simulated Concrete Pore Solution Influenced by Strain-Induced Martensitic Transformation./
Author:	Martin Diaz, Ulises.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	111 p.
Notes:	Source: Masters Abstracts International, Volume: 83-04.
Contained By:	Masters Abstracts International83-04.
Subject:	Physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28765537
ISBN:	9798538147205

Stress Corrosion Cracking of Austenitic Stainless Steel Rebar in Simulated Concrete Pore Solution Influenced by Strain-Induced Martensitic Transformation.
Martin Diaz, Ulises.

Stress Corrosion Cracking of Austenitic Stainless Steel Rebar in Simulated Concrete Pore Solution Influenced by Strain-Induced Martensitic Transformation. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 111 p.

Source: Masters Abstracts International, Volume: 83-04.

Thesis (M.S.E.)--The University of Akron, 2021.

This item must not be sold to any third party vendors.

Reinforced concrete structures (RCS) are widely used in the construction and building industries due to their increased mechanical performance and service lifetime. The most commonly used reinforced material carbon steel, however in recent years stainless steel (SS) rebars have gathered high attention as an alternative to carbon steel due to their improved corrosion protection properties. Steel RCS are commonly exposed to aggressive environments, containing chloride species in the solution and/or promoting carbonation processes, making the steel reinforcement susceptible to corrosion. In addition, RCS are also subjected to the loading they were designed for, which in combination with the corrosion susceptibility due to the aggressive environment; the RCS are likely to suffer from stress corrosion cracking (SCC). SCC is considered one of the highest risk critical factors for the failure of RCS, and hence, the study of SCC mechanisms and its influencing factors like the pH drop from the carbonation process, the chloride threshold that the steels can withstand, the material selection, the stress level and the phase influence due to the applied work have being of high interest for the research community. While several studies have been carried on finding the SCC mechanism for RCS, no agreement has yet been reached due to the numerous influencing factors. Even more, as of today no standard considers SCC as a design factor, no for carbon steel, nor for SS, which are not even regarded in the standards. To better understand the SCC mechanism of RCS, austenitic SS AISI 316 LN rebar was studied in simulated concrete pore solution at different chloride concentrations by continuous monitoring by electrochemical techniques along the entire stress-strain diagram by slow strain rate technique (SSRT). The growth and passivity breakdown of the passive film is studied by alternating current (AC) electrochemical tests, like electrochemical impedance spectroscopy (EIS) which will give information about the electrochemical properties at the interfaces, as well as by direct current (DC) test like cyclic potentiodynamic polarization (CPP) curves which will give information about the type of reaction kinetics, charge transfer or mass transport kinetics. In addition, Mott-Schottky plots were made along the loading to study the semiconducting properties of the passive film. The morphology of the fracture and the fracture mode were also analyzed by characterization techniques to study the cracking mechanism. The influence of the strain-induced martensitic transformation on the enhancement of the corrosion behavior and the accelerated crack nucleation is studied by electrochemical and characterization techniques. The strain-induced martensite transformed during manufacturing and during the straining of the sample promotes a faster and more severe localized attack by chlorides, developing a premature failure as well as changing the fracture mode of the sample compared to the austenite matrix. The final goal is to find the relationship between the electrochemical and mechanical properties of SS under the effects of SCC to be able to understand the SCC mechanism of steel RCS. The effect of the strain-induced martensite is compared to the core austenite matrix and evaluated as a function of the chloride concentration in the solution, evaluating the electrochemical response and the fractographic morphology of the samples before and after the SCC testing.

ISBN: 9798538147205Subjects--Topical Terms:

564049
Physics.
Subjects--Index Terms:

Stress corrosion cracking

Stress Corrosion Cracking of Austenitic Stainless Steel Rebar in Simulated Concrete Pore Solution Influenced by Strain-Induced Martensitic Transformation.
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520 $a Reinforced concrete structures (RCS) are widely used in the construction and building industries due to their increased mechanical performance and service lifetime. The most commonly used reinforced material carbon steel, however in recent years stainless steel (SS) rebars have gathered high attention as an alternative to carbon steel due to their improved corrosion protection properties. Steel RCS are commonly exposed to aggressive environments, containing chloride species in the solution and/or promoting carbonation processes, making the steel reinforcement susceptible to corrosion. In addition, RCS are also subjected to the loading they were designed for, which in combination with the corrosion susceptibility due to the aggressive environment; the RCS are likely to suffer from stress corrosion cracking (SCC). SCC is considered one of the highest risk critical factors for the failure of RCS, and hence, the study of SCC mechanisms and its influencing factors like the pH drop from the carbonation process, the chloride threshold that the steels can withstand, the material selection, the stress level and the phase influence due to the applied work have being of high interest for the research community. While several studies have been carried on finding the SCC mechanism for RCS, no agreement has yet been reached due to the numerous influencing factors. Even more, as of today no standard considers SCC as a design factor, no for carbon steel, nor for SS, which are not even regarded in the standards. To better understand the SCC mechanism of RCS, austenitic SS AISI 316 LN rebar was studied in simulated concrete pore solution at different chloride concentrations by continuous monitoring by electrochemical techniques along the entire stress-strain diagram by slow strain rate technique (SSRT). The growth and passivity breakdown of the passive film is studied by alternating current (AC) electrochemical tests, like electrochemical impedance spectroscopy (EIS) which will give information about the electrochemical properties at the interfaces, as well as by direct current (DC) test like cyclic potentiodynamic polarization (CPP) curves which will give information about the type of reaction kinetics, charge transfer or mass transport kinetics. In addition, Mott-Schottky plots were made along the loading to study the semiconducting properties of the passive film. The morphology of the fracture and the fracture mode were also analyzed by characterization techniques to study the cracking mechanism. The influence of the strain-induced martensitic transformation on the enhancement of the corrosion behavior and the accelerated crack nucleation is studied by electrochemical and characterization techniques. The strain-induced martensite transformed during manufacturing and during the straining of the sample promotes a faster and more severe localized attack by chlorides, developing a premature failure as well as changing the fracture mode of the sample compared to the austenite matrix. The final goal is to find the relationship between the electrochemical and mechanical properties of SS under the effects of SCC to be able to understand the SCC mechanism of steel RCS. The effect of the strain-induced martensite is compared to the core austenite matrix and evaluated as a function of the chloride concentration in the solution, evaluating the electrochemical response and the fractographic morphology of the samples before and after the SCC testing.
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