Comparison on Tensile Characteristics of Plain C–Mn Steel with Ultrafine Grained Ferrite/Cementite Microstructure and Coarse Grained Ferrite/Pearlite Microstructure

Tian, Yan; Zhao, Ming-Chun; Liu, Wenjian; Zhang, Jimou; Zhang, Min; Li, Hongying; Yin, Dong; Atrens, Andrej

doi:10.3390/ma14092309

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…There was much necking, which meant a high ductility. 15 This was consistent with the nominal engineering stress-strain curve. The SEM tensile fracture morphologies at room temperature exhibited typical dimple fracture, illustrating clear ductile dimples characteristics of microvoid coalescence as shown in Figure 4(b).…”

Section: Resultssupporting

confidence: 82%

Sulfide stress cracking (SSC) of a commercial Q345 pressure vessel steel in a wet H₂S environment

Tian,

Zhang,

Wang

et al. 2024

Materials Science and Technology

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The steel Q345 is extensively used in pressure vessels with low and medium pressure because of good mechanical properties and low cost. Good resistance to sulfide stress cracking (SSC) is required for the pressure vessel steel, but the SSC behavior of the Q345 has received little attention. This work investigated the SSC behavior of the Q345 in a wet H2S environment. The microstructure contained the irregular various-sized polygonal-like ferrite grains plus a carbon-rich degenerate pearlite banded structure. The Q345 had high ductility but failed to pass the SSC tests. The SSC cracking involved hydrogen embrittlement. The SSC preferentially occurred at the carbon-rich degenerate pearlite banded structure. The elimination of the carbon-rich degenerate pearlite banded structure is necessary to improve the SSC resistance of the Q345 pressure vessel steel.

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Section: Resultssupporting

confidence: 82%

Sulfide stress cracking (SSC) of a commercial Q345 pressure vessel steel in a wet H₂S environment

Tian,

Zhang,

Wang

et al. 2024

Materials Science and Technology

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“…The higher-magnification SEM micrograph embedded in Figure 2b revealed that the banded structure presented a lamellar arrangement with alternate thin ferrite and cementite layers, i.e., a typical pearlite characteristic. [17] When the cooling rate was ≈5 °C s À1 , the obtained microstructure was consisted of irregular various-sized polygonal-like ferrite grains plus faintly banded structure. In OM micrograph as shown in Figure 2c, the ferrite matrix region was white, and faintly banded structure region was slightly dark.…”

Section: Resultsmentioning

confidence: 95%

Effect of Cooling Rate on Sulfide Stress Cracking Resistance of a Q345 Pressure Vessel Steel Subject to Hydrogen Sulﬁde

Tian,

Zhang,

Wang

et al. 2023

steel research int.

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As an important equipment for the separation, store, and transport of the oil and natural gas in energy industry, the pressure vessels are subjected to harsh service environments of sulfide stress cracking (SSC). In this work, the effect of the cooling rate on the SSC susceptibility of a Q345 pressure vessel steel is studied. A pronounced distinction in microstructure is presented as the cooling rate is increased from ≈1 to ≈15 °C s−1. At ≈1 °C s−1, the microstructure is consisted of polygonal‐like ferrite and distinct banded pearlite. At ≈5 °C s−1, the microstructure is consisted of polygonal‐like ferrite and faintly banded pseudo‐pearlite. At ≈15 °C s−1, the microstructure is acicular ferrite with a complete elimination of banded structure. The cooling rate decides the level of the banded structure. As the cooling rate increases, the banded structure becomes relatively slight and even disappears. Strength in sort ascending is ≈1, ≈ 5, and ≈15 °C s−1. The SSC failure happens at ≈1 and ≈5 °C s−1, while does not happen at ≈15 °C s−1. The strength is not the only dominant factor responsible for the SSC failure. The SSC is preferentially generated at the banded structure. The elimination of the banded structure is necessary to improve the SSC resistance of the Q345 pressure vessel steel.

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“…The grain boundaries hindered dislocation movement. The smaller grain size had the larger proportion of grain boundaries, resulting in a more obvious hindrance [ 14 ]. In addition, the undistorted grain obtained by recrystallization annealing could also reduce the hardness.…”

Section: Resultsmentioning

confidence: 99%

Relationship between Biodegradation Rate and Grain Size Itself Excluding Other Structural Factors Caused by Alloying Additions and Deformation Processing for Pure Mg

Liu

Deng

et al. 2022

Materials

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This work studied the relationship between biodegradation rate and grain size itself, excluding other structural factors such as segregations, impure inclusions, second phase particles, sub-structures, internal stresses and textures caused by alloying additions and deformation processing for pure Mg. A spectrum of grain size was obtained by annealing through changing the annealing temperature. Grain boundary influenced the hardness and the biodegradation behavior. The hardness was grain size-dependent, following a typical Hall–Petch relation: HV=18.45+92.31d−12. The biodegradation rate decreased with decreasing grain size, following a similar Hall–Petch relation: Pi=0.17−0.68d−12 or Pw=1.34−6.17d−12. This work should be helpful for better controlling biodegradation performance of biodegradable Mg alloys through varying their grain size.

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Comparison on Tensile Characteristics of Plain C–Mn Steel with Ultrafine Grained Ferrite/Cementite Microstructure and Coarse Grained Ferrite/Pearlite Microstructure

Cited by 6 publications

References 16 publications

Sulfide stress cracking (SSC) of a commercial Q345 pressure vessel steel in a wet H₂S environment

Sulfide stress cracking (SSC) of a commercial Q345 pressure vessel steel in a wet H₂S environment

Effect of Cooling Rate on Sulfide Stress Cracking Resistance of a Q345 Pressure Vessel Steel Subject to Hydrogen Sulﬁde

Relationship between Biodegradation Rate and Grain Size Itself Excluding Other Structural Factors Caused by Alloying Additions and Deformation Processing for Pure Mg

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Comparison on Tensile Characteristics of Plain C–Mn Steel with Ultrafine Grained Ferrite/Cementite Microstructure and Coarse Grained Ferrite/Pearlite Microstructure

Cited by 6 publications

References 16 publications

Sulfide stress cracking (SSC) of a commercial Q345 pressure vessel steel in a wet H2S environment

Sulfide stress cracking (SSC) of a commercial Q345 pressure vessel steel in a wet H2S environment

Effect of Cooling Rate on Sulfide Stress Cracking Resistance of a Q345 Pressure Vessel Steel Subject to Hydrogen Sulﬁde

Relationship between Biodegradation Rate and Grain Size Itself Excluding Other Structural Factors Caused by Alloying Additions and Deformation Processing for Pure Mg

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Product

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Sulfide stress cracking (SSC) of a commercial Q345 pressure vessel steel in a wet H₂S environment

Sulfide stress cracking (SSC) of a commercial Q345 pressure vessel steel in a wet H₂S environment