Influence of refined hierarchical martensitic microstructures on yield strength and impact toughness of ultra-high strength stainless steel

Luo, Haiwen; Wang, Xiaohui; Liu, Zhenbao; Yang, Zu‐Po

doi:10.1016/j.jmst.2020.04.001

Cited by 176 publications

(36 citation statements)

References 20 publications

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“…The decrease in the grain sizes caused the significant increase in the microstructure heterogeneity. This resulted in two main effects:  reducing energy consumption to crack initiation, which was expected due to increasing its structural heterogeneity and enhancing the specific length of the grain boundaries (local heterogeneity zones) in micro-volumes of the steel specimens after the HR [41], in comparison with the as-received ones;  increasing the energy intensity to crack propagation, which was associated with high energy consumption in such a "micro-composite material" with the lamellar mesostructure [42,43].…”

Section: Calculation Of Work Spent To Crack Initiation and Propagatiomentioning

confidence: 99%

Increasing Low-Temperature Toughness of 09Mn2Si Steel through Lamellar Structuring by Helical Rolling

Panin

Власов

Моисеенко

et al. 2021

Metals

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The aim of the paper was to investigate the helical rolling parameters (a number of passes) for the microstructural modification and the low-temperature impact toughness improvement of the 09Mn2Si High Strength Low-Alloyed (HSLA) steel. In order to achieve this purpose, work spent to crack initiation and propagation was analyzed and compared with patterns of fracture surfaces. The microstructure and impact toughness values were presented in the temperature range from +20 to –70°C. Also, the fracture mechanisms in individual regions on the fracture surfaces were discussed. In addition, a methodology for computer simulation of the process was developed and implemented within the framework of the excitable cellular automata method and its integration with the kinetic theory of fracture. Finally, a theoretical analysis of the effect of grain shapes and orientations on the strain response patterns of a certain meso-volume simulating the material after the helical rolling was carried out.

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Section: Calculation Of Work Spent To Crack Initiation and Propagatiomentioning

confidence: 99%

Increasing Low-Temperature Toughness of 09Mn2Si Steel through Lamellar Structuring by Helical Rolling

Panin

Власов

Моисеенко

et al. 2021

Metals

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“…At present, the control unit of toughness in high strength structure materials is controversial [32,33], and the EBSD was used to further explore the propagation mechanism of the second crack. A second crack in Ni7.5 generated during the fracture process of the impact specimen at −60 • C was adopted for analysis as shown in Figure 16.…”

Section: The Analysis Of Crack Propagation Features From the Perspective Of Crystallographic Characteristicsmentioning

confidence: 99%

The Effect of Nickel Contents on the Microstructure Evolution and Toughness of 800 MPa Grade Low Carbon Bainite Deposited Metal

Sun

Wei

et al. 2021

Crystals

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In this work, three deposited metals with different nickel (Ni) contents were produced by active gas metal arc welding (GMAW) in order to explore the influence of Ni on the microstructure evolution and toughness of 800 MPa grade low carbon bainite deposited metal. The results showed that microstructure of the deposited metals mainly consisted of lath bainite, lath martensite, coalesced bainite (CB), and retained austenite (RA), and that the toughness was closely related to two factors: CB and RA. RA in deposited metal could improve the toughness, while the CB would deteriorate the toughness of deposited metal. As the Ni content increased, a large amount of CB was generated in the deposited metals. The RA content increased from 1.5% to 5.7% with the content of Ni increasing from 5.5% to 6.5%. However, the RA content did not increase when the Ni content increased from 6.5% to 7.5%. Additionally, the smallest control unit of toughness in 800 MPa grade low carbon bainite deposited metals is the Bain Packet (BP) from the perspective of crystallography characteristics. This work provided a reference for the chemical composition design of 800 MPa grade steel welding consumables and showed that the toughness of the deposited metal could be improved effectively by increasing the RA content while suppressing the formation of CB.

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“…The key to determining the hydrogen trapping ability of defects is to determine the binding energy between defects and hydrogen. A binding energy of ≥50 kJ/mol is a strong trap, while a binding energy of ≤30 kJ/mol is a weak trap [18][19][20][21][22]. The order of all defects according to binding energy is lattice gap < grain boundary < dislocation < vacancy < carbide [23].…”

Section: Introductionmentioning

confidence: 99%

Effects of the Addition of Nb and V on the Microstructural Evolution and Hydrogen Embrittlement Resistance of High Strength Martensitic Steels

Liu

Liao²,

Tang

et al. 2022

Scanning

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Hydrogen embrittlement can easily occur in high strength martensitic steel, manifesting itself as a sudden failure or fracture without warning and greatly threatening the safety of automotive applications. Optimizing the composition of the alloy can be performed by matching heat treatment processing methods and controlling the precipitation amounts to form hydrogen traps. In doing so, the hydrogen embrittlement susceptibility of steel can be effectively delayed, reducing the risk of hydrogen-induced delayed cracking. In this study, four kinds of 1500 MPa strength grade martensitic steel were selected for testing and supplemented with different loadings of Nb and V, respectively. Their grains, phases, and precipitations were compared by optical microscopy (OM), electron backscattered diffraction (ESBD), and transmission electron microscopy (TEM) analyses. After the addition of Nb and V, the microstructure was refined, the residual austenite content increased, and the hydrogen embrittlement resistance was significantly improved.

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Influence of refined hierarchical martensitic microstructures on yield strength and impact toughness of ultra-high strength stainless steel

Cited by 176 publications

References 20 publications

Increasing Low-Temperature Toughness of 09Mn2Si Steel through Lamellar Structuring by Helical Rolling

Increasing Low-Temperature Toughness of 09Mn2Si Steel through Lamellar Structuring by Helical Rolling

The Effect of Nickel Contents on the Microstructure Evolution and Toughness of 800 MPa Grade Low Carbon Bainite Deposited Metal

Effects of the Addition of Nb and V on the Microstructural Evolution and Hydrogen Embrittlement Resistance of High Strength Martensitic Steels

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