Effects of microstructure on crack resistance and low-temperature toughness of ultra-low carbon high strength steel

Zhao, Yuyuan; Tong, Xiaole; Wei, Xixi; Xu, Shijie; Lan, Shuhuai; Wang, X.-L.; Zhang, Z.W.

doi:10.1016/j.ijplas.2019.01.004

Cited by 86 publications

(20 citation statements)

References 41 publications

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“…Low carbon steel with a uniform microstructure is considered to have better toughness because of its ferritic structure. High carbon steel with a martensitic structure has more brittle sites, providing lesser resistance to crack propagation [31,32]. However, in this case, a uniform microstructure with a mostly ferritic structure proves to be a hindrance to dislocations in all directions, resulting in a slanted fracture in each plane, as shown in Figure 8.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Ductile Fracture Obtained by Charpy Impact Test of a Steel Structure Created by Robot-Assisted GMAW-Based Additive Manufacturing

Waqas

Qin

Xiong

et al. 2019

Metals

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In this study, gas metal arc welding (GMAW) was used to construct a thin wall structure in a layer-by-layer fashion using an AWS ER70S-6 electrode wire with the help of a robot. The Charpy impact test was performed after extracting samples in directions both parallel and perpendicular to the deposition direction. In this study, multiple factors related to the resulting absorbed energy have been discussed. Despite being a layered structure, homogeneous behavior with acceptable deviation was observed in the microstructure, hardness, and fracture toughness of the structure in both directions. The fracture is extremely ductile with a dimpled fibrous surface and secondary cracks. An estimate for fracture toughness based on Charpy impact absorbed energy is also given.

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Section: Resultsmentioning

confidence: 99%

Analysis of Ductile Fracture Obtained by Charpy Impact Test of a Steel Structure Created by Robot-Assisted GMAW-Based Additive Manufacturing

Waqas

Qin

Xiong

et al. 2019

Metals

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“…10, the nanostructured steels failed through a mixed brittle intergranular-cleavage mechanism. There might be other factors, apart from the impurities segregating along the prior austenite grain boundaries during slow cooling, possibly contributing to the low impact toughness of the nanostructured steels [84].…”

Section: The Impact Toughness Of the Nano-precipitate-strengthened Lomentioning

confidence: 99%

Low-carbon advanced nanostructured steels: Microstructure, mechanical properties, and applications

Kong

Jiao

et al. 2021

Sci. China Mater.

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Low-carbon advanced nanostructured steels have been developed for various structural engineering applications, including bridges, automobiles, and other strength-critical applications such as the reactor pressure vessels in nuclear power stations. The mechanical performances and applications of these steels are strongly dependent on their microstructural features. By controlling the size, number density, distribution, and types of precipitates, it is possible to produce nanostructured steels with a tensile strength reaching as high as 2 GPa while keeping a decent tensile elongation above 10% and a reduction of area as high as 40%. Besides, through a careful control of strength contributions from multiple strengthening mechanisms, the nanostructured steels with superior strengths and low-temperature impact toughness can be obtained by avoiding the temper embrittlement regime. With appropriate Mn additions, these nanostructured steels can achieve a triple enhancement in ductility (total tensile elongation, TE of~30%) at no expense of strengths (yield strength, YS of~1100 to 1300 MPa, ultimate tensile strength, UTS of~1300 to 1400 MPa). More importantly, these steels demonstrate good fabricability and weldability. In this paper, the microstructure-property relationships of these advanced nanostructured steels are comprehensively reviewed. In addition, the current limitations and future development of these nanostructured steels are carefully discussed and outlined.

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“…The higher strain in the crystal lattice can be reflected by the local misorientation angle. The distribution of local misorientation in some areas is obviously uneven [17]. Dark blue represents smaller local misorientation, while green represents medium local misorientation.…”

Section: The Relationship Between the Microstructure And He Micromechanism Of Cleavage Fracturementioning

confidence: 99%

“…Both high-angle grain boundaries and effective grain size in the microstructure have an important influence on crack propagation. Zhao et al reported the influence of an ultra-low carbon bainite steel microstructure on low-temperature impact properties, indicating that high-angle grain boundaries can deflect the crack from extending and efficiently hinder the crack propagation [17]. Lan et al reported that the effect of microstructural characteristics on the toughness of the simulated coarse-grained heataffected zone of high-strength, low-carbon bainitic steel, indicating that M-A constituents are primarily responsible for the low toughness of the simulated coarse-grained heataffected zone (CGHAZ).…”

Section: Introductionmentioning

confidence: 99%

Effects of Microstructure on the Low-Temperature Toughness of an X80 × D1422 mm Heavy-Wall Heat-Induced Seamless Bend

Liu

Wang

et al. 2021

Metals

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The relationship between the microstructure and the low-temperature toughness of an X80 × D1422 mm heavy-wall heat-induced seamless bend was investigated, including the influence of microstructure on crack initiation and crack propagation. Using optical microscopy, scanning electron microscopy, transmission electron microscopy, and electron backscattered diffraction, the microstructure and crystallographic orientation characteristics were studied. An instrumented impact tester was used to investigate the impact toughness. The results showed that during the hot bending process, there was a difference in the induction heating temperature and the cooling rate results in the uneven microstructure of the inner surface, center position, and outer surface of the bend. The center position was mainly composed of granular bainite and exhibited the best combination of strength and toughness. The ductile–brittle transition temperatures of the inner surface, center position, and outer surface were −88, −85, and −60 °C, respectively. In the process of impact deformation, the non-uniformly distributed strain concentration regions are likely to cause uneven distribution of plastic deformation and the nucleation of microcracks. The high ratio of high-angle grain boundaries and the smaller effective grain size of the inner surface and center position lead to higher crack growth absorption energy. The low crack propagation energy of the outer surface is attributed to the fact that the high-angle grain boundary does not effectively deviate or arrest the crack propagation, and multiple microcracks are connected to one another and cause fracture failure.

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Effects of microstructure on crack resistance and low-temperature toughness of ultra-low carbon high strength steel

Cited by 86 publications

References 41 publications

Analysis of Ductile Fracture Obtained by Charpy Impact Test of a Steel Structure Created by Robot-Assisted GMAW-Based Additive Manufacturing

Analysis of Ductile Fracture Obtained by Charpy Impact Test of a Steel Structure Created by Robot-Assisted GMAW-Based Additive Manufacturing

Low-carbon advanced nanostructured steels: Microstructure, mechanical properties, and applications

Effects of Microstructure on the Low-Temperature Toughness of an X80 × D1422 mm Heavy-Wall Heat-Induced Seamless Bend

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