Characterizing dislocation configurations and their evolution during creep of a new 12% Cr steel

Yadav, Surya Deo; El-Tahawy, Moustafa; Kalácska, Szilvia; Dománková, Mária; Canelo-Yubero, David; Poletti, María Cecilia

doi:10.1016/j.matchar.2017.11.017

Cited by 45 publications

(13 citation statements)

References 71 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%

“…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%

“…It seems that these steels also show the sigmoidal shape of time to rupture versus applied stress curves. As compared to the 12% Cr steels with conventional B and N content, such as SAVE12 (11Cr-3W-3C0-40 ppm B/600 ppm N) [37] and the 12Cr steel studied by Yadav et al (12Cr-2.5W-3.5Co-2Cu-0.36Ta-60 ppm B/600 ppm N) [57,58], the 12% Cr and 12% Cr-Ta steels demonstrate significantly higher creep strength in the high-stress region (>120 MPa).…”

Section: The 10% Cr and 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%

Section: The 11-12% Cr Steelsmentioning

confidence: 99%

Section: The 10% Cr and 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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“…The creep behavior of real and simulated welds in 9-12% Cr steels with a special emphasis on the HAZ has been a subject of extensive investigations by many authors [2][3][4][5][6][7][8]. The dependence of creep resistance on the microstructure of 9-12% Cr steels including PAG and subgrain sizes [9][10][11], dislocation structure and evolution [12][13][14][15], and precipitates size, distribution, and coarsening [16][17][18][19][20][21][22] has been studied extensively. Theoretical calculations of stationary creep rate and/or lifetime prediction of creep-loaded materials using either empirical or physical models, supported by experimental results, were quite successfully accomplished by many authors [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Stationary Creep Rate in Heat-Affected Zone of Martensitic 9–12% Cr Steels

Kafexhiu¹,

Burja²

2020

Metals

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The purpose of the present study was to evaluate the contribution of distinct regions of the simulated heat-affected zone (HAZ) to the overall creep behavior of welded joints in the X20 and P91 steels. The HAZ was simulated by means of dilatometry at four peak temperatures (900, 1000, 1200, and 1350 °C) with a consequent tempering at 650 °C. Microstructure features of the four simulated HAZ regions including precipitates, prior austenite grains, and subgrains were quantified by means of electron microscopy. The quantified parameters and the measured hardness were used in three physical models for evaluation of the stationary creep rate (ε˙ at 170 MPa and 580 °C. The resulting ε˙ values fall within the range 10−8–10−7 s−1, being in good agreement with the experimental data with a similar thermal history, but an order of magnitude lower than the measured values for the parent metal of the studied steels (10−7–10−6 s−1). Depending on the model utilized, their output can be linearly related to hardness, subgrain size, or interparticle spacing. The model relating ε˙ to hardness was the most consistent one in prediction, being always lower for higher peak temperatures.

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“…There are also several recent examples of application of this model to cold forming (Schacht et al, 2017) or creep (Yadav et al, 2017). The conventional constitutive models for single crystals, including the kinematics of single-crystal plasticity and dislocation density evolution, are described in the literature, as well (Zhuang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Possibilities of the numerical solution of the dislocation evolution equation for stochastic variables

Milenin¹,

Rauch²,

Szeliga³

et al. 2019

cmms

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The model describing evolution of dislocation population based on fundamental works of Kocks, Estrin and Mecking (KEM) is a useful tool in modelling of metallic materials processing. In combination with the Sandstrom and Lagneborg approach it can predict changes of the dislocation density accounting for hardening, recovery and recrystallization. Numerical solutions of a one-parameter model (average dislocation density), as well as for two types of dislocations and three types of dislocation are described in the literature. All these solutions were performed for deterministic variables. On the other hand, an advanced modelling of materials requires often an information about distribution of parameters. This is the case when uncertainty of the model has to be evaluated or when an information about distribution of product properties is needed. The latter is crucial when deterioration of local formability is caused by sharp gradients of properties. Thus, the investigation of possibilities of numerical solution for the KEM model with stochastic variables was the main objective of the present work. Evolution equation was written for the distribution function and solution was performed using Monte Carlo method. Analysis of the results with respect to the reliability and computing costs was performed. The conclusions towards selection of the best approach were formulated.

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Characterizing dislocation configurations and their evolution during creep of a new 12% Cr steel

Cited by 45 publications

References 71 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

Evaluation of Stationary Creep Rate in Heat-Affected Zone of Martensitic 9–12% Cr Steels

Possibilities of the numerical solution of the dislocation evolution equation for stochastic variables

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