Effects of Shape and Orientation of MnS on Charpy Impact and Bending Properties in Hot-Press-Forming (HPF) Steels

Jo, Min Cheol; Kim, Selim; Kim, Seongwoo; Oh, Jinkeun; Suh, In Sik; Lee, Sunghak

doi:10.1007/s11661-019-05128-w

Cited by 5 publications

(1 citation statement)

References 31 publications

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“…Interrupted bending tests were also conducted on the same-sized specimens at an interval of a bending angle of 3°. According to the previous bending procedures coupled with a digital image correlation (DIC) technique 35 – 37 , the local tensile strain was concentrated mainly at the center of the outer surface of the bend specimen. Thus, the specimen was bent at a certain bending angle, taken out from the test set-up, and half-sectioned along the longitudinal direction.…”

Section: Methodsmentioning

confidence: 99%

Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels

Kim

et al. 2021

Sci Rep

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The bending angle at the peak load is regarded as the most important parameter for evaluating bending properties of hot-press-forming (HPF) steels. However, it is not a mechanics-based parameter for the bending criterion, and the data interpretation is difficult because bending criteria in relation with microstructures and associated bending mechanisms have not been verified yet. In this study, effects of coating and baking treatments on bending angles at the peak load of three kinds of 1470 MPa-grade HPF steels were investigated by interrupted three-point bending tests coupled with direct microstructural observation. According to direct observations of sequential cracking processes of V-shaped crack (V-crack), bending procedures were classified into four stages: (1) formation of small V-crack, (2) increase in number and size of V-cracks, (3) initiation of shear-crack propagation from the V-crack tip, and (4) further propagation and opening of the shear crack. The minimum bending angle required for initiating the shear-crack propagation from the V-crack tip was defined as a critical angle, which meant the boundary between the 2nd and 3rd stages. The present bending behavior related with critical bending angle and V-cracking could be interpreted similarly by the fracture-mechanics concept, i.e., the initiation of shear-crack propagation.

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Section: Methodsmentioning

confidence: 99%

Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels

Kim

et al. 2021

Sci Rep

Self Cite

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Influence of Zr and Ti on MnS Inclusions, Microstructure, and Mechanical Properties of F38MnVS6 Steel

Qiu,

Zhang,

et al. 2024

steel research int.

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The influence of Zr and Ti on the inclusions, microstructure, and mechanical properties of three sets of steel prepared using a vacuum induction melting furnace is analyzed. In steel without Zr and Ti, MnS is mainly distributed in the grain boundary with a rod‐like or dendritic morphology, an average diameter of 10 μm, and a quantity of 2.08 × 104 m−3. After alloying with Zr and Ti, MnS in steel is evenly distributed and adopted a blocky or spherical morphology with an average diameter of 7.2 μm and a quantity of 11.01 × 104 m−3. The oxygen content in steel do not have a remarkable impact on the MnS morphology. ZrO2 and Ti2ZrO6 formed in steel display a slight lattice disregistry with MnS. During solidification, MnS precipitates easily as types I and III MnS, with oxides serving as the core. The MnS composite exhibits remarkable deformation resistance during forging. The addition of Zr and Ti increases the proportion of intragranular ferrite in steel and decreases the pearlite lamellae spacing and average grain size, increasing the yield strength from 745 to 820 MPa and the impact energy from 21 to 56 J at room temperature. Overall, the addition of Zr and Ti considerably improves the mechanical properties of steel.

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High cycle rotating bending fatigue performance and fracture behavior in a pearlite–ferrite dual-phase steel

Zhao

et al. 2021

J. Iron Steel Res. Int.

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Effects of Shape and Orientation of MnS on Charpy Impact and Bending Properties in Hot-Press-Forming (HPF) Steels

Cited by 5 publications

References 31 publications

Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels

Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels

Influence of Zr and Ti on MnS Inclusions, Microstructure, and Mechanical Properties of F38MnVS6 Steel

High cycle rotating bending fatigue performance and fracture behavior in a pearlite–ferrite dual-phase steel

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