Ductility prediction of HPDC aluminum alloy using a probabilistic ductile fracture model

Shen

et al. 2023

steel research int.

Self Cite

Herein, a medium‐Mn steel containing 4 wt% Mn is designed to achieve ultrahigh tensile strength and good ductility by the quenching and tempering process. The effects of tempering temperature on the microstructure, tensile behavior, and fracture properties under different stress states are explored. It is observed that tempering temperature influences the fracture mechanisms of the ultrahigh‐strength steels. Both ductile fracture strain and cleavage fracture strength of the investigated medium‐Mn steel are affected by the tempering temperature. The impacts of tempering temperature on volume fraction, carbon content of retained austenite (RA), and tensile properties are quantitatively analyzed. Detailed microstructure analysis reveals that both volume fraction and carbon content of the RA are increased in the tempered steels, accompanied by improved tensile properties than in quenched conditions. The superior tensile properties are achieved after tempering at 250 °C, with the ultrahigh yield strength of 1590 MPa, ultrahigh tensile strength of 1963 MPa, and total elongation of 12%. The corresponding relationship between microstructure and mechanical properties is investigated, with a focus on the change of residual stress, the occurrence of carbon redistribution/carbide precipitation, the decrease of dislocation density of martensite, and the presence of transformation‐induced plasticity effect during deformation.

Section: Effect Of Tempering Temperature On Fracture Behavior Under D...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Tempering Temperature on the Microstructure, Deformation and Fracture Properties of an Ultrahigh Strength Medium‐Mn Steel Processed by Quenching and Tempering

Shen

et al. 2023

steel research int.

Self Cite

“…Crack assessment for girth-welded pipes with surface and embedded cracks was provided using a strain-based CTOD method [14,15]. A three-dimensional, nonlinear elastic-plastic model was established to study the effects of girth welds on offshore pipelines [14][15][16][17][18]. These studies were all based on traditional fracture mechanics.…”

Section: Introductionmentioning

confidence: 99%

Fracture Response of X80 Pipe Girth Welds under Combined Internal Pressure and Bending Moment

Zhu

Jia

et al. 2023

Materials

In order to determine the effect of defect size on the pipeline fracture performance of girth welds in oil and gas pipelines, ABAQUS was used to simulate the fracture responses of X80 pipelines with girth weld defects under internal pressure and bending moment conditions based on damage mechanics. In particular, the length and depth of defects were parametrically studied; the defect depth range was 20–80% of the wall thickness, and the circumferential length range of the defects was 5–20% of the pipeline circumference. The results show that, under the combined action of internal pressure and bending moment, the defect depth was more associated with adverse effects than the circumferential length of the defect. The failure load did not linearly decrease as the size of the defect increased, but when the depth of the defect reached a certain value, the failure load suddenly decreased.

“…Kong et al [6] investigated the effects of microdefects and the stress state on the failure behavior of cast aluminum alloy A356 by experimental and numerical methods. Considering the distribution of porosity within the die-cast components, Zhang et al [7] investigated the failure characteristics of the die-cast aluminum alloy Aural-2 by experimental and numerical methods. They proposed a probabilitydependent damage model to represent the behavior of the fracture under a wide range of stress states, and found a significant dependence of the initiating fracture strain on the stress triaxiality.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Fracture Performance of Die-Cast A356 Aluminum Alloy Based on Modified Mohr–Coulomb Model

Zhang

Yang

et al. 2023

Applied Sciences

The fracture performance and damage prediction of die-cast materials are critical to guarantee the safe application of die-cast structural components in lightweight vehicles. Monotonic loading experiments were conducted on different shapes of die-cast aluminum alloy A356 specimens. Finite element simulation models of the A356 monotonic loading experiments were established, and the stress state of the specimens during the loading process was analyzed. The Modified Mohr–Coulomb (MMC) failure model of A356 was fitted by the failure strain under different stress states. Finally, the established MMC failure model was verified by a uniaxial compression experiment and bending experiment. The results show that the MMC failure model can be applied to the prediction of the fracture behavior of A356.