Evolution of the substructure of a novel 12% Cr steel under creep conditions

Yadav, Surya Deo; Kalácska, Szilvia; Dománková, Mária; Canelo-Yubero, David; Resel, Roland; Groma, István; Béal, Coline; Sonderegger, Bernhard; Sommitsch, Christof; Poletti, María Cecilia

doi:10.1016/j.matchar.2016.03.015

Cited by 45 publications

(13 citation statements)

References 42 publications

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“…For comparison of creep strength of 11-12% Cr steels, the 12Cr steel studied by Yadav et al with conventional B and N was also used [57,58].…”

Section: The 11-12% Cr Steelsmentioning

confidence: 99%

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9–12% Cr Heat-Resistant Martensitic Steels with Increased Boron and Decreased Nitrogen Contents

Dudova

2022

Metals

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As a promising alloying approach, the modification of chemical composition by increasing the B content and decreasing the N content has been applied to improve the creep resistance of various 9–12% Cr heat-resistant martensitic steels. This paper presents an overview of the creep strength and related microstructural features of the 9% Cr and 10–12% Cr martensitic steels with high B and low N contents. The factors that determine the optimal B/N ratio in steels are considered. The creep properties are compared with those for similar steels with conventional B and N contents. The relationships between the stability of lath structure and precipitates of M23C6, Laves, and MX phases and the creep strength of steels are considered. Further perspectives of this modification of alloying by high boron and low nitrogen are outlined.

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“…For comparison of creep strength of 11-12% Cr steels, the 12Cr steel studied by Yadav et al with conventional B and N was also used [57,58].…”

Section: The 11-12% Cr Steelsmentioning

confidence: 99%

“…Data are adapted from Refs. [2,5,6,8,11,[15][16][17][18][20][21][22][25][26][27][31][32][33][34][35][36][37][38][39][41][42][43][44][45][46][49][50][51][52][53][54][55][56][57][58]. * N-normalization, T-tempering.…”

Section: The 11-12% Cr Steelsmentioning

confidence: 99%

9–12% Cr Heat-Resistant Martensitic Steels with Increased Boron and Decreased Nitrogen Contents

Dudova

2022

Metals

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“…However, degradation of strength may occur due to the evolution of the microstructure at elevated temperatures and over-heating over a long service exposure time [42][43][44][45][46]. It is widely recognised that fracture in P91 steels occurs through progressive nucleation, growth and eventual coalescence of voids.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of deformation process and fracture mechanisms of P91 steel at 600 °C in small punch tensile testing

Chen

Yang

Al-Abedy

et al. 2020

Materials Characterization

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This paper investigates the microstructural evolution and fracture mechanism of the P91 steel during small punch tensile tests. Disc specimens, 8 mm in diameter and 0.5 mm in thickness, were tested in a small punch test rig at 600 °C using a constant displacement rate of 2 µm/s.Interrupted small punch tensile tests were performed to investigate the microstructural evolution in different deformation regimes. Deformed specimens were characterised by scanning electron microscopy and electron backscatter diffraction. Microstructure characterisation showed that block boundary alignment occurred in the plastic deformation direction, before achieving the maximum punch load. It was revealed that the martensitic structure was recovered when the tests progressed. The elongation of recovered grains occurred after achieving the maximum punch load. In addition, it was shown that the voids tended to nucleate along the recovered grain boundaries and became elongated to align with the plastic flow within the specimen.

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“…The thermal stability of the microstructure, especially the thermal stability of the precipitate phases, has been known as a critical factor for the creep rupture [7]. During the longterm creep exposure process, the nucleation and coarsening of precipitate phases deteriorate the properties of martensitic lath [8,9]. Pandey et al [10] have proved that the effects of a small number of MX carbonitrides on creep behavior are negligible in the deformation process, therefore, the effect of MX carbonitrides on creep behavior will not be discussed in this study.…”

mentioning

confidence: 99%

“…During the long-term creep exposure process, the content of the Cr element in M 23 C 6 particles increases and M 23 C 6 carbides coarsen. Laves phase, which is a type of creep-brittle phase, will nucleate and coarsen during the long-term creep exposure process, and it can degrade the creep behavior of the welded joint significantly [9]. The nucleation and coarsening of Laves phase particles can inevitably deplete the solute W and Mo elements, which play a role in solid-solution strengthening [11].…”

mentioning

confidence: 99%

Characterization of Multi-layer Weld Metal and Creep–Rupture Behavior of Modified 10Cr–1Mo Welded Joint

Zhang

Shao

Cui

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The rupture behavior of the modified 10Cr-1Mo steel multi-layer welded joint is determined by the fine-grain zones of the weld metal adjacent to the fusion line during the long-term creep test at 620 °C. The microstructures of multi-layer weld metal before and after the creep tests were characterized in detail, and its role in creep behavior was systematically investigated. Most grain boundaries of subgrains represented the low-angle boundaries in the weld metal adjacent to the fusion line both before and after the creep test. The widths of grains in the fine-grain zones were about 0.5-1 μm. The fracture morphology appeared as "wave" structure due to the cracking initiating from multi-layer grain boundaries in the fine-grain zones. Some W elements that melted into weld metal adjacent to the fusion line altered the thermodynamic and kinetic conditions of the Laves phase formation during long-term creep exposure. Laves phase particles mainly distributed along the grain boundaries due to the faster diffusion and segregation of Mo, W, and Si elements. Moreover, higher-density grain boundaries in the fine-grain zones led to easier nucleation and growth of Laves phase particles. Compared with other areas in the welded joint, the size of Laves phase particles in the fine-grain zones of the weld metal adjacent to the fusion line was the largest ones. The interface between Laves phase particles and the matrix acted as the nucleation site of creep micro-cavities. The creep micro-cavities grew up at the expense of fine-grain boundaries and even grew across the grain boundary deeply into adjacent grains, and then developed to cracks in the fine-grain zones.

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Evolution of the substructure of a novel 12% Cr steel under creep conditions

Cited by 45 publications

References 42 publications

9–12% Cr Heat-Resistant Martensitic Steels with Increased Boron and Decreased Nitrogen Contents

9–12% Cr Heat-Resistant Martensitic Steels with Increased Boron and Decreased Nitrogen Contents

Characterisation of deformation process and fracture mechanisms of P91 steel at 600 °C in small punch tensile testing

Characterization of Multi-layer Weld Metal and Creep–Rupture Behavior of Modified 10Cr–1Mo Welded Joint

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