Prediction of crack growth in CrMoV cast steel after long-term service at high temperature

Kawashima, Fumiko; Tokiyoshi, Takumi; Igari, Toshihide; Kanaya, Akihiro; Kusumoto,; Hiroe, Tetsuyuki; Takao, Namihira

doi:10.1016/j.msea.2008.04.093

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…These elements can improve the strength and toughness by refining the grains and forming microstructure, such as acicular ferrite. However, 2.25Cr-1Mo-0.25V steels frequently fail after long-term service [21,22].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal

Yan

Cao

et al. 2020

Materials

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The demand for heat-resistant steel has increased owing to its utility in numerous devices that must withstand high steam pressures and high temperatures, such as turbine rotors and blades in ultra-supercritical power plants. It is inevitable to join heat-resistance steel part by welding method, so it is important to maintain the toughness of the weld metals. In this study, the microstructure, low-temperature impact toughness, and fracture surface of as-welded and post-weld heat treatment (PWHT) of 2.25Cr-1Mo-0.25V weld metal were investigated. The microstructures of the as-welded and PWHT specimens are granular bainite and ferrite, respectively. This work revealed the relationship between effective microstructure nearby crack initiation origin and low temperature impact toughness for both the as-welded and PWHT specimens. The evolution of the microstructure and prior austenite was then investigated using confocal laser scanning microscopy (CLSM) to observe the formation of coarse ferrite grain structures. A suggestion for enhancing the low-temperature toughness was provided based on the effect of adjusting Mn content and forming acicular ferrite.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal

Yan

Cao

et al. 2020

Materials

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Failure Analysis and Service Properties of 20Cr1Mo1VNbTiB Bolt in 660 MW Supercritical Thermal Power Unit

Zhang

Zheng

Zhang

et al. 2022

J Fail. Anal. and Preven.

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Effect of heat treatment process on microstructure and properties of S47450 bolt

Tao

Sun

Wang

et al. 2022

Practical Metallography

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The effects of heat treatment process on the microstructure and mechanical properties of S47450 bolt materials were studied by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD), tensile test, impact test and hardness test. The results showed that in the temperature range selected by the test, the quenched martensite of the bolt material after quenching at 1070 °C and tempering at 670 °C was fully refined and evenly distributed, and the precipitation of Cr23C6 played the role of precipitation hardening. It showed the excellent comprehensive mechanical properties, with the Brinell hardness reaching 295 HBW and the tensile strength of 1035 MPa. The elongation was 16 %, and the impact energy at room temperature was 21 J.

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Prediction of crack growth in CrMoV cast steel after long-term service at high temperature

Cited by 3 publications

References 4 publications

Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal

Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal

Failure Analysis and Service Properties of 20Cr1Mo1VNbTiB Bolt in 660 MW Supercritical Thermal Power Unit

Effect of heat treatment process on microstructure and properties of S47450 bolt

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