Investigation on micromechanism and stress state effects on cleavage fracture of ferritic-pearlitic steel at −196 °C

He, Jinshan; Lian, Junhe; Golisch, Georg; He, Anrui; Di, Yidu

doi:10.1016/j.msea.2017.01.042

Cited by 16 publications

(10 citation statements)

References 27 publications

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“…Energy-dispersive X-ray spectroscopy (EDX) analyses were performed at particle A (Figure 11f) and the results are shown in Figure 11g. It can be seen that O, Fe, Mn, Cr, Si, and S were the main elements in particle A, which could be identified as either non-metallic inclusion, such as MnS [30] or oxide. Comparing Figure 11b-e, the dimple size in the horizontal samples (numbers 3, 6, and 8) were found to be similar to that in the vertical sample (number 11).…”

Section: Fractographymentioning

confidence: 99%

Microstructure and Mechanical Properties of Medium Carbon Steel Deposits Obtained via Wire and Arc Additive Manufacturing Using Metal-Cored Wire

Lin

Goulas

et al. 2019

Metals

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Wire and arc additive manufacturing (WAAM) is a 3D metal printing technique based on the arc welding process. WAAM is considered to be suitable to produce large-scale metallic components by combining high deposition rate and low cost. WAAM uses conventional welding consumable wires as feedstock. In some applications of steel components, one-off spare parts need to be made on demand from steel grades that do not exist as commercial welding wire. In this research, a specifically produced medium carbon steel (Grade XC-45), metal-cored wire, equivalent to a composition of XC-45 forged material, was deposited with WAAM to produce a thin wall. The specific composition was chosen because it is of particular interest for the on-demand production of heavily loaded aerospace components. The microstructure, hardness, and tensile strength of the deposited part were studied. Fractography studies were conducted on the tested specimens. Due to the multiple thermal cycles during the building process, local variations in microstructural features were evident. Nevertheless, the hardness of the part was relatively uniform from the top to the bottom of the construct. The mean yield/ultimate tensile strength was 620 MPa/817 MPa in the horizontal (deposition) direction and 580 MPa/615 MPa in the vertical (build) direction, respectively. The elongation in both directions showed a significant difference, i.e., 6.4% in the horizontal direction and 11% in the vertical direction. Finally, from the dimple-like structures observed in the fractography study, a ductile fracture mode was determined. Furthermore, a comparison of mechanical properties between WAAM and traditionally processed XC-45, such as casting, forging, and cold rolling was conducted. The results show a more uniform hardness distribution and higher tensile strength of the WAAM deposit using the designed metal-cored wires.

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Section: Fractographymentioning

confidence: 99%

Microstructure and Mechanical Properties of Medium Carbon Steel Deposits Obtained via Wire and Arc Additive Manufacturing Using Metal-Cored Wire

Lin

Goulas

et al. 2019

Metals

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“…Alharbi et al [19] investigated the stress state of martensite and ferrite before cracking of dual phase DP1000 steel and estimated for crack initiation in the martensite. He et al [20] reported that for a ferritic-pearlitic steel, the initiation of the cleavage fracture is located in the pearlitic phase where the ferrite and the cementite show a lamella structure with different properties.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effect of Inclusions on the Residual Stress Distribution in High-Strength Martensitic Steels During Cooling

Lian

Bao

et al. 2019

Applied Sciences

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In high-strength martensitic steels, the inclusions significantly affect the material performance especially in terms of fatigue properties. In this study, a numerical procedure to investigate the effect of the inclusions types and shapes on the residual stresses during the cooling process of the martensitic steels is applied systematically based on the scanning electronic microscopy (SEM) and energy dispersive spectrometer (EDS) results of different types of inclusions. The results show that the maximum residual stress around the interface between Mg-Al-O inclusion and the matrix is the largest, followed by TiN, Al-Ca-O-S, and MnS when the inclusions are assumed as perfect spheres for simplicity. However, these results are proved to be 28.0 to 48.0% inaccurate compared to the results considering actual shapes of inclusions. Furthermore, the convex shape of inclusion will lead to stress concentration in the matrix while the concave shape of inclusion will lead to stress concentration in the inclusion. The residual stress increases with the increase of inclusion edge angle. The increase rate is the largest for TiN inclusions on the concave angle, which leads to extreme stress concentration inside TiN inclusion.

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“…According to the statistical analysis of a figure of 200:1 magnification, the steel is composed of 43 vol.-% ferrite (white region) and 57 vol.-% pearlite (dark region) respectively. Since the few inclusions do not play a significant role during the process of cleavage fracture, they are not taken into account for the construction of RVEs [21].…”

Section: Rve Generationmentioning

confidence: 99%

Micromechanical modeling of cleavage fracture for a ferritic-pearlitic steel

Piao

Wang

et al. 2019

Engineering Fracture Mechanics

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Investigation on micromechanism and stress state effects on cleavage fracture of ferritic-pearlitic steel at −196 °C

Cited by 16 publications

References 27 publications

Microstructure and Mechanical Properties of Medium Carbon Steel Deposits Obtained via Wire and Arc Additive Manufacturing Using Metal-Cored Wire

Microstructure and Mechanical Properties of Medium Carbon Steel Deposits Obtained via Wire and Arc Additive Manufacturing Using Metal-Cored Wire

Numerical Study of the Effect of Inclusions on the Residual Stress Distribution in High-Strength Martensitic Steels During Cooling

Micromechanical modeling of cleavage fracture for a ferritic-pearlitic steel

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