Effect of Strength and Microstructure on Stress Corrosion Cracking Behavior and Mechanism of X80 Pipeline Steel in High pH Carbonate/Bicarbonate Solution

Zhu, Min; Du, Cuiwei; Li, Yong; Sheng-rong, Wang; Zhao, Tianliang; Jia, Jinghuan

doi:10.1007/s11665-014-0880-4

Cited by 26 publications

(7 citation statements)

References 37 publications

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“…To meet the increased demand of energy, large diameter, high-strength pipes are widely used for the purpose of improving energy transport efficiency (Ref [1][2][3][4][5]. Strength and low-temperature toughness, weldability, resistance to hydrogen-induced cracking, and resistance to fatigue were the critical properties required in these types of steels (Ref 6).…”

Section: Introductionmentioning

confidence: 99%

Effects of Ultra Fast Cooling on Microstructure and Mechanical Properties of Pipeline Steels

Tian

Li²,

Wang

et al. 2015

J. of Materi Eng and Perform

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X70 (steel A) and X80 (steel B) pipeline steels were fabricated by ultra fast cooling (UFC). UFC processing improves not only ultimate tensile strength (UTS), yield strength (YS), yield ratio (YS/UTS), and total elongation of both steels, but also their Charpy absorbed energy (A K ) as well. The microstructures of both steels were all composed of quasi polygonal, acicular ferrite (AF), and granular bainite. MA islands (the mixtures of brittle martensite and residual austenite) are more finely dispersed in steel B, and the amount of AF in steel B is much more than that in steel A. The strength of steel B is higher than that of steel A. This is mainly attributed to the effect of the ferrite grain refinement which is resulted from UFC processing. The finely dispersed MA islands not only provide dispersion strengthening, but also reduce loss of impact properties to pipeline steels. UFC produces low-temperature transformation microstructures containing larger amounts of AFs. The presence of AF is a crucial factor in achieving desired mechanical properties for both steels. It is suggested that the toughness of the experimental steel increases with increasing the amount of AF.

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Section: Introductionmentioning

confidence: 99%

Effects of Ultra Fast Cooling on Microstructure and Mechanical Properties of Pipeline Steels

Tian

Li²,

Wang

et al. 2015

J. of Materi Eng and Perform

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“…The microstructural features of X70, X80, and X100 pipeline steels were examined with optical microscope, as shown in Figure 1. It can be seen that X70 steel ( Figure 1(a)) exhibited a complex microstructure including fine acicular ferrite (AF) and granular bainite (BF), which gave rise to high strength of pipeline steel [23,24]. The microstructure of X80 steel (Figure 1(b)) may be a combination of polygonal ferrite (PF) and granular bainite (BF), and X100 steel (Figure 1(c)) was also mainly composed of AF, BF, and martensitic-austenitic particles (M-A) distributed along the grain boundaries, and M-A phases can improve significantly the strength of X100 pipeline steel as the second phase.…”

Section: Resultsmentioning

confidence: 99%

The Pitting Susceptibility Investigation of Passive Films Formed on X70, X80, and X100 Pipeline Steels by Electrochemical Noise and Mott-Schottky Measurements

Zhang

Liang

Shi

et al. 2015

International Journal of Corrosion

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The pitting susceptibility of passive films formed on X70, X80, and X100 pipeline steels was investigated by means of electrochemical noise (EN) and Mott-Schottky measurements. The EN results were analyzed according to the shot-noise theory and stochastic theory. Pit initiation process was analyzed quantitatively using the Weibull distribution function. Pit growth process was simulated by Gumbel distribution function. The experimental results of Mott-Schottky plots showed that the passive films formed on the three pipeline steels displayed an n-type semiconductor character, and the passive film for X100 pipeline steel has the lowest donor density (ND) among the three passive films. The EN results demonstrated that X100 pipeline steel had the lowest pit initiation rate and pit growth probability, which implied that the X100 pipeline steel had the lowest pitting susceptibility.

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“…Most of the papers have discussed the role of microstructure on the nature of crack. For instance, Zhu et al [22] investigated the mechanism of failure by the SCC in X80 pipeline steel in high pH carbonate and bicarbonate solution. These authors concluded that the nature of the SCC cracks mainly depends on the microstructure of steel.…”

Section: Role Of Microstructure On the Scc Cracksmentioning

confidence: 99%

“…At the crack initiation stage, the crack type is intergranular; however, both types of cracks are observed at the later stage. [22]. Reproduced with permission from [22], Springer Nature, 2014.…”

Section: Role Of Microstructure On the Scc Cracksmentioning

confidence: 99%

“…Roffey et al [26] investigated the SCC in an austenitic stainless steel hydrocarbon gas pipeline and concluded that transgranular SCC cracks initiate from corrosion pits from the internal and external surfaces and are divided to some branches, see Figure 4a,b. [22]. Reproduced with permission from [22], Springer Nature, 2014.…”

Section: Role Of Microstructure On the Scc Cracksmentioning

confidence: 99%

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

Mohtadi-Bonab

2019

Metals

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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.

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Effect of Strength and Microstructure on Stress Corrosion Cracking Behavior and Mechanism of X80 Pipeline Steel in High pH Carbonate/Bicarbonate Solution

Cited by 26 publications

References 37 publications

Effects of Ultra Fast Cooling on Microstructure and Mechanical Properties of Pipeline Steels

Effects of Ultra Fast Cooling on Microstructure and Mechanical Properties of Pipeline Steels

The Pitting Susceptibility Investigation of Passive Films Formed on X70, X80, and X100 Pipeline Steels by Electrochemical Noise and Mott-Schottky Measurements

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

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