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

Chen, Hao; Yang, Rui; Al-Abedy, H.K.; Li, H.; Sun, Wei; Jones, I.A.

doi:10.1016/j.matchar.2020.110514

Cited by 18 publications

(3 citation statements)

References 51 publications

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“…Choudhary et al [13] delineated three different temperature regimes for the tensile properties of boron added reduced nitrogen containing P91 steel at different temperatures and strain rates. Chen et al [14] performed a small punch tensile test on P91 steel, indicating that the recovered grains are elongated along the plastic flow direction and the void coalescence at the recovered grain boundaries affect the final fracture. During the tensile deformation of Cr-Mn-Si-Ni alloy steel at room temperature (RT), dislocation rearrangement occurs sequentially, and the transformation from dislocations to low angle grain boundaries (LAGBs) and high angle grain boundaries (HAGBs) leads to the refinement of microstructure [15].…”

Section: Introductionmentioning

confidence: 99%

Tensile Behavior, Constitutive Model, and Deformation Mechanisms of MarBN Steel at Various Temperatures and Strain Rates

Cai

Wang

et al. 2022

Materials

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To reduce harmful gas emission and improve the operational efficiency, advanced ultra-supercritical power plants put forward higher requirements on the high temperature mechanical properties of applied materials. In this paper, the tensile behavior and deformation mechanisms of MarBN steel are discussed at different strain rates (5 × 10−3 s−1, 5 × 10−4 s−1, and 5 × 10−5 s−1) under room temperature and 630 °C. The results show that the tensile behavior of the alloy is dependent on temperature and strain rate, which derived from the balance between the average dislocation velocity and dislocation density. Furthermore, observed dynamic recrystallized grains under severe deformation reveal the existence of dynamic recovery at 630 °C, which increases the elongation compared to room temperature. Finally, three typical constitutive equations are used to quantitatively describe the tensile deformation behavior of MarBN steel under different strain rates and temperatures. Meanwhile, the constitutive model of flow stress for MarBN steel is developed based on the hyperbolic sine law.

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Section: Introductionmentioning

confidence: 99%

Tensile Behavior, Constitutive Model, and Deformation Mechanisms of MarBN Steel at Various Temperatures and Strain Rates

Cai

Wang

et al. 2022

Materials

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“…Different colors were used to show the boundaries with different misorientations. Therefore, the boundaries with misorientations between 10 and 49° (grain boundaries) were distinguishable from the ones belonged to misorientations higher than 49° (block boundaries); the boundaries between 10 and 49º delimit equiaxed grains (ferrite) and the ones higher than 49º define microstructures with an elongated or lath shape (martensite) [28,29]. It should also be mentioned that the misorientation range for the packet boundaries might feasibly overlap with that of block boundaries.…”

Section: Metallography and Microstructural Examinationsmentioning

confidence: 99%

Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties

Torkamani

Raygan

García‐Mateo

et al. 2021

Archiv.Civ.Mech.Eng

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In this study, dual-phase (DP, ferrite + martensite) microstructures were obtained by performing intercritical heat treatments (IHT) at 750 and 800 °C followed by quenching. Decreasing the IHT temperature from 800 to 750 °C leads to: (i) a decrease in the volume fraction of austenite (martensite after quenching) from 0.68 to 0.36; (ii) ~ 100 °C decrease in martensite start temperature (Ms), mainly due to the higher carbon content of austenite and its smaller grains at 750 °C; (iii) a reduction in the block size of martensite from 1.9 to 1.2 μm as measured by EBSD. Having a higher carbon content and a finer block size, the localized microhardness of martensite islands increases from 380 HV (800 °C) to 504 HV (750 °C). Moreover, despite the different volume fractions of martensite obtained in DP microstructures, the hardness of the steels remained unchanged by changing the IHT temperature (~ 234 to 238 HV). Applying lower IHT temperature (lower fraction of martensite), the impact energy even decreased from 12 to 9 J due to the brittleness of the martensite phase. The results of the tensile tests indicate that by increasing the IHT temperature, the yield and ultimate tensile strengths of the DP steel increase from 493 to 770 MPa, and from 908 to 1080 MPa, respectively, while the total elongation decreases from 9.8 to 4.5%. In contrast to the normalized sample, formation of martensite in the DP steels could eliminate the yield point phenomenon in the tensile curves, as it generates free dislocations in adjacent ferrite.

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“…Many other properties have been explored in terms of the coverage of both standards, such as the elastic modulus, fracture toughness, creep response, and fatigue behavior [4,5]. In terms of testing conditions, the SPT has been used for characterizing the mechanical response of materials submitted to magnetic fields [6], at cryogenic temperatures [6][7][8], at elevated temperatures [9][10][11][12], and immersed in embrittling media [13].…”

Section: Introductionmentioning

confidence: 99%

Small Punch Test on Jominy Bars for High-Throughput Characterization of Quenched and Tempered Steel

Miguel,

Berriozabalgoitia,

Artola

et al. 2023

Metals

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Studying the effect of quench and tempering heat treatments on steel, more specifically screening the effect of the austenitizing, quenching, and tempering conditions on mechanical properties, can be extremely material- and time-consuming when standard tensile testing specimens are employed. Jominy bar end quench testing has been used as a standard method to reduce the resources that are required for this type of screening. Jominy bar testing by itself shows, though, the limitation of yielding only hardness and microstructure as a result. In the last few years, the small punch test (SPT) standard has been developed. This technique can obtain an estimation of tensile mechanical properties with miniaturized specimens, which can be dissected from Jominy bars. The paper proposes a new testing methodology for screening the outcome of heat treatment conditions by combining the Jominy bar testing and SPT. Quench and tempering of API 5L X65Q pipe steel is used as a case study to describe the proposed methodology. The ability of the Jominy with SPT to detect variations in the mechanical properties produced by heat treatments is shown. This methodology can be directly applied as a high-throughput testing approach in the optimization of heat treatments.

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

Cited by 18 publications

References 51 publications

Tensile Behavior, Constitutive Model, and Deformation Mechanisms of MarBN Steel at Various Temperatures and Strain Rates

Tensile Behavior, Constitutive Model, and Deformation Mechanisms of MarBN Steel at Various Temperatures and Strain Rates

Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties

Small Punch Test on Jominy Bars for High-Throughput Characterization of Quenched and Tempered Steel

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