The effect of M23C6 on the high-temperature tensile strength of two austenitic heat-resistant steels: 22Cr–25Ni–Mo–Nb–N and 25Cr–20Ni–Nb–N

Peng, Bowen; Zhang, Hongxiang; Hong, Jie; Gao, Jianbao; Zhang, Hanqian; Wang, Qijiang; Li, Jin-Fu

doi:10.1016/j.msea.2011.01.079

Cited by 32 publications

(6 citation statements)

References 9 publications

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“…Reference source not found.(d)). DDC initiates at the incoherent M 23 C 6 /γ interface, because the incoherent M 23 C 6 /γ interface has weak interface strength and higher stress concentration [49,[55][56][57] . Together with the thermal and solidification stresses induced during welding, the incoherent M 23 C 6 /γ interface is prone to crack initially, which exacerbates DDC in NiCrFe-7 alloy at elevated temperatures.…”

Section: Discussionmentioning

confidence: 99%

Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

Mo,

Hu,

et al. 2015

Journal of Materials Science & Technology

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Section: Discussionmentioning

confidence: 99%

Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

Mo,

Hu,

et al. 2015

Journal of Materials Science & Technology

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“…High plasticity of austenitic steels in the as-received condition results, among other things, from their solid solution strengthening and a large number of slip bands [3,4]. significant influence of M23C6 carbides on YS at elevated temperature was pointed out by the authors of [29]. At the same time, during service at elevated temperatures, a gradual decrease in the concentration of solute elements occurs in the austenitic matrix [30], which translates into a reduction in effect of solid solution strengthening mechanism on the strength properties of the steel.…”

Section: Mechanical Properties Of Hr3c Steel After Servicementioning

confidence: 97%

The Effect of Service on Microstructure and Mechanical Properties of HR3C Heat-Resistant Austenitic Stainless Steel

et al. 2020

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The physical metallurgical tests were performed on the test samples made of HR3C steel, taken from a section of a pipeline in the as-received condition and after approximately 26,000 h of service at 550 °C. In the as-received condition, the test material had austenitic microstructure with numerous large primary Z-phase precipitates inside the grains. The service of the test steel mainly contributed to the precipitation processes inside the grains and at the grain boundaries. After service, the following precipitates were identified in the microstructure of the test steel: Z-phase (NbCrN) and M23C6 carbides. The Z-phase precipitates were observed inside the grains, whereas M23C6 carbides - at the boundaries where they formed the so-called continuous grid. The service of the test steel contributed to the growth of the strength properties, determined both at room and elevated temperature (550, 600 °C), compared to the as-received condition. Moreover, the creep properties of HR3C steel after service were higher than those of the material in the as-received condition. The increase in the strength properties and creep resistance was connected with the growth of strengthening of the test steel by the precipitation of Z-phase and M23C6 carbides.

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“…This transformation is accompanied by the precipitation of secondary carbides which typically nucleate and grow within the austenitic matrix [7]. It has been demonstrated that secondary carbides play a very important role since they significantly improve the creep resistance by hindering dislocations [8][9][10][11][12]. Therefore controlling the number density, the volume fraction and the size distribution of these carbides is a key issue to improve the creep resistance.…”

Section: Introductionmentioning

confidence: 99%

Influence of solidification induced composition gradients on carbide precipitation in FeNiCr heat resistant steels

et al. 2018

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Secondary precipitation of Cr-rich carbides in heat resistant austenitic stainless steels has been investigated both experimentally and using finite element simulations. The microstructural evolutions in two commercial grades were characterized using electron microscopy. A special emphasis was given on the peculiar spatial distribution of M23C6 secondary carbides exhibiting precipitate free zones surrounding primary carbides, and high density precipitate zones extending with longer aging times. Solidification induced chemical composition gradients were clearly exhibited in the as-cast alloys with significant chromium depletion in the vicinity of primary M7C3 carbides. It is then proposed that these gradients play a major role in the secondary precipitation mechanism. Classical nucleation and growth theories have been adapted to account for (i) the flux of solutes with large difference in diffusion coefficients, (ii) the initial composition gradients in the matrix and, (iii) the chemical driving force for nucleation and growth of M23C6 carbides. Within this framework, the whole kinetics has been reproduced. It clearly shows that the spatial distribution of secondary carbides that play a key role in the creep resistance of these alloys is the result of a complex interaction between initial composition gradients in as-cast alloys and solute flux resulting from phase transformation during aging.

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The effect of M23C6 on the high-temperature tensile strength of two austenitic heat-resistant steels: 22Cr–25Ni–Mo–Nb–N and 25Cr–20Ni–Nb–N

Cited by 32 publications

References 9 publications

Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

The Effect of Service on Microstructure and Mechanical Properties of HR3C Heat-Resistant Austenitic Stainless Steel

Influence of solidification induced composition gradients on carbide precipitation in FeNiCr heat resistant steels

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