Superior fracture toughness in a high-strength austenitic steel with heterogeneous lamellar microstructure

Niu, Gang; Zurob, Hatem S.; Misra, R.D.K.; Tang, Qibo; Zhang, Zhihui; Nguyen, Minh-Tam; Wang, Lili; Wu, Huibin; Zou, Yu

doi:10.1016/j.actamat.2022.117642

Cited by 86 publications

(12 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In detail, there exists a mixture of dimples and voids in samples with 0% and 80% lifetime fractions of C‐F exposure (Figure 12B,H), while only relatively large and more uniform dimples are detected at samples tested by prior C‐F with 10% and 30% fractions (Figure 12D,F). This is because DC networks in sample deformed by 30% lifetime fraction can hinder the further growth of the voids during tensile 58 . As a result, the average size of dimples formed by the coalescence of small voids increases in comparison to that in Figure 12B.…”

Section: Resultsmentioning

confidence: 88%

“…This is because DC networks in sample deformed by 30% lifetime fraction can hinder the further growth of the voids during tensile. 58 As a result, the average size of dimples formed by the coalescence of small voids increases in comparison to that in Figure 12B. Nevertheless, as the DC size increases in sample with 80% lifetime fraction of prior C-F, these inhibition effects are strongly weakened; thus, the voids reappear in Figure 12H.…”

Section: Fracture Behaviormentioning

confidence: 85%

See 1 more Smart Citation

Remnant tensile and creep properties of aluminized AISI 321 austenite stainless steel under prior creep–fatigue interaction

Chen

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Aluminized AISI 321 steels applied as heat exchange tube are generally subjected to creep-fatigue (C-F) exposure during service. Remaining tensile and creep performance of this steel at 620 C were therefore studied under prior C-F deformation. Results revealed that residual properties exhibit an initial increase and followed degradation with rising lifetime fraction of prior C-F.The tensile strength and creep lifespan reach highest at 30% lifetime fraction, since dislocation cell networks are well developed and secondary nanotwins are activated at substrate. Additionally, dynamic recovery and wavy slips occurred in coatings partially accommodate local plastic deformations and inhibit defect initiations, avoiding premature material fracture. On the other hand, these networks could restrain the increase in coating thicknesses. When the lifetime fraction of prior C-F increases to 80%, declined remnant properties are observed, which is attributed to the recovery of dislocation cells and carbide coarsening. Meanwhile, coating microcracks also accelerate steel failure.

show abstract

Section: Resultsmentioning

confidence: 88%

Section: Fracture Behaviormentioning

confidence: 85%

Remnant tensile and creep properties of aluminized AISI 321 austenite stainless steel under prior creep–fatigue interaction

Chen

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…On the other hand, nano/ultrafine lamellar structures with sufficient internal recrystallization facilitated the full activation of more dislocations when a load was applied. 22 Refined equiaxed grain near edge interface region shows a lower hardness value than nano/ultrafine lamellar structures near central interface region. This is mainly because refined equiaxed grains with sufficient dynamic recrystallization cannot effectively hinder dislocation slip.…”

Section: Resultsmentioning

confidence: 96%

Microstructures and strengthening mechanism of 2D laminated structures in Ni balls after high‐speed collisions with 316 L stainless steel

Jinlong

Zhou

Zhang

2023

Engineering Reports

View full text Add to dashboard Cite

In many cases, due to high surface stress, stress concentration and wear, the metal material starts to fail from the surface. It is necessary to investigate interface evolution characteristics under high‐speed collisions for widely used metal materials. The microstructures and strengthening mechanism of the Ni balls after high‐speed collisions with 316 L stainless steel were investigated by a self‐designed high‐speed collisions test system. It was found that ultrafine twins and α'‐martensite were formed in 316 L stainless steel (316 L SS) near the interface region. The elongated nano/ultrafine lamellar structures with high‐angle grain boundaries in Ni ball were formed near central interface region, while more equiaxed nano/ultrafine grains with random orientations and high‐angle grain boundaries were formed near edge interface region due to friction process and high shear stress. The gradient structure in the Ni ball near central interface region was formed due to normal stress, while the high shear strain could promote the formation of finer equiaxed grains in the Ni ball near edge interface region. Moreover, in addition to grain refinement strengthening, nano/ultrafine lamellar structures with sufficient intragranular recrystallization facilitated the activation of more dislocations and increased the strengthening of the Ni ball near central interface region.

show abstract

“…As mentioned above, crash events usually occur under bending-dominated deformation, which is close to plane-strain conditions. Therefore, improving the fracture strain under plane strain is of significance to increasing vehicle safety [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

Fracture Strain of Al–Si-Coated Press-Hardened Steels under Plane-Strain Bending

Hou

Song²,

et al. 2022

Materials

View full text Add to dashboard Cite

Press-hardened steel (PHS) is widely applied to fabricate vehicle body structures for attaining mass reduction and fuel economy without sacrificing occupant safety. The VDA bendability test is often used to characterize the fracture resistance of PHS under plane-strain bending conditions. As lightweighting continues to be a design imperative in the automotive industry, it is desirable to develop and adopt more press-hardened components with higher fracture resistance. In this work, four Al–Si-coated 22MnB5 steels with various initial thicknesses and coating weights were studied. A newly developed methodology was used to calculate the fracture limit strain under plane-strain bending. The results indicate that although the four investigated 22MnB5 steels exhibit similar tensile properties under uniaxial tension, their bending performance per the VDA 238-100 standard differs significantly. The PHS with a low coating weight possesses a higher bending angle and, hence, a larger fracture limit strain. Meanwhile, the peak bending force can be 10% higher than the PHS with a standard coating weight at the same sheet thickness. Therefore, it is expected that PHS with higher fracture strain will have the potential for lightweighting due to its enhanced resistance to fracture and higher energy absorption capability.

show abstract

Superior fracture toughness in a high-strength austenitic steel with heterogeneous lamellar microstructure

Cited by 86 publications

References 58 publications

Remnant tensile and creep properties of aluminized AISI 321 austenite stainless steel under prior creep–fatigue interaction

Remnant tensile and creep properties of aluminized AISI 321 austenite stainless steel under prior creep–fatigue interaction

Microstructures and strengthening mechanism of 2D laminated structures in Ni balls after high‐speed collisions with 316 L stainless steel

Fracture Strain of Al–Si-Coated Press-Hardened Steels under Plane-Strain Bending

Contact Info

Product

Resources

About