Revealing the Fracture Mechanism of Twinning‐Induced Plasticity Steels

Luo, Zhi‐Chao; Huang, Mingxin

doi:10.1002/srin.201700433

Cited by 18 publications

(2 citation statements)

References 26 publications

(39 reference statements)

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“…These stripes consist of interconnected rows of voids. [ 31 ] Misra et al [ 32 ] discovered that fractures in high‐strength ultrafine‐grained steels are characterized by a row of small holes beneath the streaks or ripples. The deformation mechanism caused by twinning is related to the transverse grain fracture behavior of NG/UFG steel.…”

Section: Resultsmentioning

confidence: 99%

Effect of Warm Deformation on Mechanical Properties and Deformation Mechanism of Nano/Ultrafine‐Grained 304 Stainless Steel

Zhao

et al. 2022

steel research int.

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To prevent the performance of 304 stainless steel with nano/ultrafine grain from being damaged during cold forming, the deformation temperature is increased to above the Md point, and its mechanical properties and deformation mechanism during warm forming are studied. The significant effects of rolling temperature on the microstructural evolution of nano/ultrafine‐grained 304 stainless steel deformation are characterized by X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy, and the relationships between temperature, stacking fault energy (SFE), and deformation mechanisms are discussed. The results show that the tensile strength of 304 austenitic stainless steel decreases with an increase in the tensile temperature from room temperature to 900 °C, and the total elongation decreases first with increasing temperature. The elongation at 400 °C is the worst, only 32%. The dislocation slip becomes the only deformation mechanism due to the high SFE. Then, the total elongation begins to increase, and the highest elongation is 288% at 800 °C, showing superplastic behavior and the deformation mechanism is dynamic recrystallization, and grain boundary sliding.

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Section: Resultsmentioning

confidence: 99%

Effect of Warm Deformation on Mechanical Properties and Deformation Mechanism of Nano/Ultrafine‐Grained 304 Stainless Steel

Zhao

et al. 2022

steel research int.

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“…쌍정유기소성강은 높은 균일연신율에도 불구하고 일반 연성금속재료와는 달리 독특한 인장 파괴 거동을 나타낸다. 즉, 거시적으로는 necking이 거의 없는 취성파괴 거동을 보이는 반면 미시적으로는 파면이 dimple들로 구성되어 있 는 연성파괴 특성을 나타낸다 [5,6]. 쌍정유기소성강의 취 성파괴 특성은 동적가공시효에 의한 Portevin Le Chatelier (PLC) 전단밴드 형성에 기인하는 것으로 알려져 있다 [7,8].…”

Section: 대한금속 • 재료학회지 제62권 제5호 (2024년 5월)unclassified

Notched Tensile Fracture of a Fe-15Mn-0.6C-2Al Twinning Induced Plasticity Steel at Room Temperature

Yoo,

Chung,

Moon

et al. 2024

Korean J. Met. Mater.

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The tensile fracture behavior of an Al-bearing TWIP steel was investigated by conducting a series of tensile tests on smooth and notched specimens with different notch geometries, focusing on the effects of evolution of the stress triaxiality and the effective strain during deformation. The flow curve and digital image correlation (DIC) analysis evidenced suppression of dynamic strain aging due to Al addition, and therefore, the effects of local inhomogeneous deformation associated with Portevin-Le Chatelier (PLC) band on fracture could be excluded. The smooth specimen fractured with negligible necking despite the absence of PLC bands. As a result, the effective strain was uniform through the gage section and the stress triaxiality (η) of ~0.33 was nearly unchanged over the entire cross-section up to the maximum load. This led to the fracture surface of the smooth specimen being entirely covered with fine equiaxed dimples. For notched specimens, the fracture strain was drastically reduced with decreasing notch radius, indicating the high notch susceptibility of the steel. The effective strain of the notched specimens was the highest at the edge of the notch root, regardless of the notch radius, so cracks first developed at the surface of the notch root. Although the η at the center of the notched specimens (0.40~0.48 depending on the notch radius) was higher than that of the smooth one, the center of the fracture surface of all notched specimens exhibited dimple features that were very similar to the smooth one, even in size. In contrast, in spite of the same η of ~0.33, fractography at the edge of the notched specimens revealed a fracture mode transition from dimple fracture to void sheet fracture to quasi-cleavage fracture as the notch radius decreased. The present results were rationalized in terms of the local evolution of stress triaxiality and effective strain during deformation, which were analyzed using the finite elemental method and DIC technique. It can be said that the fracture mode of TWIP steel, showing limited necking, was more influenced by the distribution and/or gradient of stress traiaxiality and effective strain rather than their local absolute values - that is, the severer their gradient is, the easier the quasi-cleavage fracture occurs.

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Discrete element method using cohesive plastic beam for modeling elasto-plastic deformation of ductile materials

Nguyen

Debenath

et al. 2020

Comp. Part. Mech.

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Revealing the Fracture Mechanism of Twinning‐Induced Plasticity Steels

Cited by 18 publications

References 26 publications

Effect of Warm Deformation on Mechanical Properties and Deformation Mechanism of Nano/Ultrafine‐Grained 304 Stainless Steel

Effect of Warm Deformation on Mechanical Properties and Deformation Mechanism of Nano/Ultrafine‐Grained 304 Stainless Steel

Notched Tensile Fracture of a Fe-15Mn-0.6C-2Al Twinning Induced Plasticity Steel at Room Temperature

Discrete element method using cohesive plastic beam for modeling elasto-plastic deformation of ductile materials

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