A study of the mechanism of delamination fracture in bainitic magnetic yoke steel

Tao, Junhui; Hu, Shubing; Yan, Fengyuan; Zhang, Yongfeng; Langley, Myrle

doi:10.1016/j.matdes.2016.06.120

Cited by 8 publications

(6 citation statements)

References 37 publications

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“…occurrence of the crack source in the half thickness of the cross section of the specimen during tension test [42]. The fracture surfaces of the samples after test in higher RH environment are severely corroded and show different fracture modes from that in air.…”

Section: Ssrtt Results Under Different Humidity For M10bmentioning

confidence: 94%

“…However, from a macro perspective in Figure 10c,e,g,i the fracture has more tearing layers and a delamination fracture pattern, which remains at a low strain rate or occurs after the introduction of humidity. Some researchers reported that the delamination fracture appeared at half thickness of the cross section, where stress exceeded yield strength to accelerate the occurrence of the crack source in the half thickness of the cross section of the specimen during tension test [42]. The fracture surfaces of the samples after test in higher RH environment are severely corroded and show different fracture modes from that in air.…”

Section: Ssrtt Results Under Different Humidity For M10bmentioning

confidence: 99%

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Effect of Relative Humidity on Mechanical Degradation of Medium Mn Steels

Liu

Shen

et al. 2020

Materials

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Medium Mn steels have been considered as the next-generation materials for use in the automotive industry due to their excellent strength and ductility balance. To reduce the total weight and improve the safety of vehicles, medium Mn steels look forward to a highly promising future. However, hydrogen-induced delayed cracking is a concern for the use of high strength steels. This work is focused on the service characteristics of two kinds of medium Mn steels under different relative humidity conditions (40%, 60%, 80% and 100%). Under normal relative humidity (about 40%) at 25 °C, the hydrogen concentration in steel is 0.4 ppm. When exposed to higher relative humidity, the hydrogen concentration in steel increases slowly and reaches a stable value, about 0.8 ppm. In slow strain rate tensile tests under different relative humidity conditions, the tensile strength changed, the hydrogen concentration increased and the elongation decreased as well, thereby increasing the hydrogen embrittlement sensitivity. In other words, the smaller the tensile rate applied, the greater the hydrogen embrittlement sensitivity. In constant load tests under different relative humidity conditions, the threshold value of the delayed cracking of M7B (‘M’ referring to Mn, ‘7’ meaning the content of Mn, ‘B’ denoting batch annealing) steel maintains a steady value of 0.82 σb (tensile strength). The threshold value of the delayed cracking of M10B significantly changed along with relative humidity. When relative humidity increased from 60% to 80%, the threshold dropped sharply from 0.63 σb to 0.52 σb. We define 80% relative humidity as the ‘threshold humidity’ for M10B.

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Section: Ssrtt Results Under Different Humidity For M10bmentioning

confidence: 94%

Section: Ssrtt Results Under Different Humidity For M10bmentioning

confidence: 99%

Effect of Relative Humidity on Mechanical Degradation of Medium Mn Steels

Liu

Shen

et al. 2020

Materials

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“…And then, more and more TiN and TiC particles would precipitate in RT330 enamel substrate. However, in the same time of solution, the solid solution elements in the matrix increased with the increasing solution temperature . The amount of solid solution of TiN and TiC particles at 900 °C was much more than that at 850 °C, which reduced the number of TiN and TiC particles after the crystallization treatment at the temperature of 900 °C.…”

Section: Resultsmentioning

confidence: 95%

Effect of Crystallization Temperature on the Microstructures and Mechanical Properties of Enamel Substrate RT330

Tao

Yan

et al. 2016

Adv Eng Mater

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The experimental crystallization simulates the manufacturing process of the heat sink in a heat exchanger used in nuclear power stations. The effect of the temperature of crystallization on the microstructures and mechanical properties of enamel substrate RT330 was investigated using an optical microscope, scanning electron microscope, transmission electron microscope and others. The experiment demonstrates that second-phase particles generated at the bottom of dimples enhance the RT330 mechanical properties. Due to the interaction between the precipitation and the solid solution, the density of precipitations (TiN and TiC) reaches the maximum when crystallization treatment is at 850 C.

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“…It is difficult to eliminate during heating and rolling [4,5]. Many studies [6][7][8][9][10][11][12][13][14][15][16] suggested that centerline segregation decreases the mechanical performance of final products, such as: Low temperature toughness, weldability, and resistance to sour gas worsen; delamination fracture and band structure increase. References [17][18][19][20] suggested that control of centerline segregation in continuously cast slab can effectively improve low temperature toughness and elongation of pipeline steel.…”

Section: Introductionmentioning

confidence: 99%

Controlling Variability in Mechanical Properties of Plates by Reducing Centerline Segregation to Meet Strain-Based Design of Pipeline Steel

Guo

Liu

Wang

et al. 2019

Metals

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Low variability in mechanical properties is required for pipeline project designs to meet a strain-based design, which is used in regions of large ground movements. The objective of this study is to elucidate the influence of centerline segregation in continuously cast slab on variability in the mechanical property of pipeline steel, and controlling centerline segregation can meet the requirements of a strain-based design. Mannesmann rating method was used to evaluate the degree of segregation of two slabs and its effect on variability in mechanical properties of corresponding plates. Microstructural characterization indicated that bainite/martensite was formed in a segregated area where the content of C and Mn enriched. The mechanical property results indicated that controlling the degree of centerline segregation can reduce tensile strength variability and improve ductile-brittle transition temperature (DBTT).

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A study of the mechanism of delamination fracture in bainitic magnetic yoke steel

Cited by 8 publications

References 37 publications

Effect of Relative Humidity on Mechanical Degradation of Medium Mn Steels

Effect of Relative Humidity on Mechanical Degradation of Medium Mn Steels

Effect of Crystallization Temperature on the Microstructures and Mechanical Properties of Enamel Substrate RT330

Controlling Variability in Mechanical Properties of Plates by Reducing Centerline Segregation to Meet Strain-Based Design of Pipeline Steel

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