The important role of martensite laths to fracture toughness for the ductile fracture controlled by the strain in EA4T axle steel

Liang, Yilong; Long, Shaolei; Xu, Pingwei; Lu, Yemao; Jiang, Yun; Liang, Yu; Yang, Ming

doi:10.1016/j.msea.2017.03.110

Cited by 65 publications

(23 citation statements)

References 20 publications

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“…Correlation of the crack behaviour with the orientation of martensite blocks (Figure 9D) also supports this assumption. Moreover, interaction of a crack tip with martensitic structure is already known to result in crack path deflection and rotation, bending and shearing of laths 35 . Relatively small size and high anisotropy of key structural elements of martensite—blocks and packets 56 —seem to be the reason of generally planar microstructure‐independent fatigue crack propagation within a fisheye, yet microstructure‐sensitive local path deflections.…”

Section: Discussionmentioning

confidence: 99%

“…Detailed hardness and residual stress distribution along the cross section of a specimen can be found elsewhere 34 . The average martensitic block size, which is a key structural parameter of lath martensite, 35 was estimated to be 3.63 μm (Figure 1C). Areal distribution of equivalent grain diameter, which corresponds to the block size, was calculated by means of orientation image map (OIM) analysis software by EDAX Inc.…”

Section: Methodsmentioning

confidence: 99%

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On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

Seleznev

Weidner

Biermann

2020

Fatigue Fract Eng Mat Struct

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A detailed microscopic analysis of fracture surfaces of 42CrMo4-hardened steel after ultrasonic fatigue testing revealed globular and cylindrical particles located in ridges along the crack propagation direction. Observed particles could be easily taken for non-metallic inclusions; however, chemical analysis showed that they are of the same composition as the steel matrix. The formation of such round-shaped debris was found to be a result of cutting out the matrix fragments by 'en passant' cracks interaction and their subsequent fretting burnishing. Possible correlation of the parameters of ridges and debris with cyclic plastic zone width and martensite structure is discussed.42CrMo4 steel, en passant cracks, fretting, high cycle fatigue, ultrasonic fatigue testing (USFT)

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

Seleznev

Weidner

Biermann

2020

Fatigue Fract Eng Mat Struct

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“…In Table , C i ( i = 1, 2, and 3) represents the ratios among the multilevel microstructures ( d r , d p , d b , and d l ), and D i ( i = 1, 2, and 3) is the number of the packet, block, and lath in a prior austenite grain from the ratio C i with equal integers. Using the results shown in Table , the length‐to‐width ratio ( L / W ) of martensite lath was calculated, and the results are listed in Table with the assumption that d p is the length of lath in Figure a …”

Section: Resultsmentioning

confidence: 99%

“…In the 1970s, several studies built relationships between multilevel microstructures and strength/toughness using methods such as a Hall–Petch relationship and electron backscatter diffraction (EBSD) analysis. For example, an early work of Tomita and Okabayashi regarded d p as the primary microstructural parameter responsible for controlling the yield strength and ductile‐brittle transition temperature.…”

Section: Introductionmentioning

confidence: 99%

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Effective Microstructure Unit in Control of Plasticity during Strain‐Controlled Fracture

Long

Liang

Lin

et al. 2019

steel research int.

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Strain‐controlled fracture is investigated in 20CrNi2Mo steel using the Hall–Petch relationship, electron backscatter diffraction (EBSD), and other techniques. An interesting result is that the ductility of the tested steel increases with a coarsening of prior austenite grains. This finding is in contrast to conventional understanding. Meanwhile, the strain after necking is approximately 2/3 of the total strain, and the value of UC (crack propagation energy per unit volume) reaches 95% of UK (static toughness). The ductility of 20CrNi2Mo steel also depends on crack propagation. Furthermore, the Hall–Petch relationships between ductility and multilevel microstructure demonstrate that lath is the effective control unit of the plasticity of the tested steel. Lath also plays a key role in crack propagation that results from the rotating, bending, and shearing of lath, as confirmed by fracture analysis and EBSD.

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Effect of Reheating Temperatures on Hot Ductility and Precipitation Behavior of Low‐Carbon Steels

Sadeghi

Zargar

Lahino

et al. 2022

steel research int.

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The influence of reheating temperatures on hot ductility is investigated in two Ni‐, Mo‐, and Cu‐containing low‐carbon steels. The effects of solution treatment conditions at 1623, 1673 K, and remelting at 1803 K on the reduction in area (RA) are analyzed. The results show an RA trough in the range of 973–1173 K in all experimental conditions. At 973 K, which is close to the Ae3 temperature of both steel grades, ductility drop is caused by the formation of the thin ferrite film at the prior austenite grain boundary. Higher RA values are achieved after reheating to 1623 K, mainly due to smaller austenite grain size by the action of preformed precipitation throughout the matrix. In contrast, increased reheating temperatures result in relatively poor RA values because of the large austenite grain size due to the dissolution of preformed precipitate and reprecipitation at the grain boundaries during cooling. A comparison between two steel grades shows that better ductility at 973 K is achieved in low Ni‐containing steel due to the relatively thick ferrite film. The effects of alloy composition and preformed precipitate's existence on hot ductility are further discussed based on the matrix strengthening and reprecipitation behavior.

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The important role of martensite laths to fracture toughness for the ductile fracture controlled by the strain in EA4T axle steel

Cited by 65 publications

References 20 publications

On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

Effective Microstructure Unit in Control of Plasticity during Strain‐Controlled Fracture

Effect of Reheating Temperatures on Hot Ductility and Precipitation Behavior of Low‐Carbon Steels

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