Glossary of Terms—Failure Analysis and Prevention

Miller, Brett A.; Parrington, Ronald J.; Shipley, Roch J.; Dennies, Daniel P.

doi:10.31399/asm.hb.v11.a0006798

Cited by 7 publications

(13 citation statements)

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“…[ 48,49 ] Therefore, the existence of the big 9 R CRP at the grain boundary might be one reason for poor ductility as the CRP in 9 R acts as the high‐stress concentrating location (stress reservoir), which triggers an early intergranular fracture or brittle fracture at the grain boundaries. [ 50 ] The change of the CRP structure from BCC to 9 R, which occurs concurrently with the loss of the coherency between the CRP and its surrounding BCC‐ferritic matrix, contributes to the limited ductility represented by 17% TE. [ 51 ]…”

Section: Discussionmentioning

confidence: 99%

Yield Strength Enhancement Without Ductility Loss Through Controlling the Intercritical Annealing Time in Medium‐Mn Steels

Elbeltagy

Shen

et al. 2023

Adv Eng Mater

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Herein, the effect of shortening the intercritical annealing (IA) time in a two‐step process “intercritical annealing and tempering (IAT)” on the microstructure and the mechanical properties of medium‐manganese steel (MMnS) made of Fe–0.05C–7Mn–1.5Cu–1.5Ni–1.5Al–1.5Si–0.5Mo (wt%) and containing copper‐rich (CRP) and Ni(Al/Mn) precipitates is investigated. The atom probe tomography (APT), electron backscattering diffraction (EBSD), and the synchrotron X‐ray diffraction (SYXRD) are used to study precipitation, phase microstructure evolution, the austenite stability, and deformation mechanisms. Shortening the IA step, which is carried out at 700 °C, from 2 min (IAT‐2) to 1 min (IAT‐1), results in a yield strength (YS) increment of around 218 MPa with less than 1% loss of ductility. While the enhanced yield strength in IAT‐1 is attributed to the four times higher precipitates’ number density (n), the insignificant loss of ductility is attributed to the enhanced austenite stability factor from 4.5 to 9.2 in IAT‐2 and IAT‐1, respectively. The simultaneous increase in YS without ductility loss reflects that controlling the IA time is a promising strategy to overcome the yield strength and ductility trade‐off without the need for higher additions of costly alloying elements such as Ni, Al, Mn, and Cu.

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Section: Discussionmentioning

confidence: 99%

Yield Strength Enhancement Without Ductility Loss Through Controlling the Intercritical Annealing Time in Medium‐Mn Steels

Elbeltagy

Shen

et al. 2023

Adv Eng Mater

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“…Impurity segregation at the PAGBs is the most common explanation for this kind of failure, and no link between Si content and impurity segregation has been found in the literature. [26] Therefore, the increase in yield stress due to higher Si levels is the most likely explanation for the increase in DBT temperature observed. Both increased solid-solution strengthening and decreased tempering of the matrix are thought to contribute, though the influence of each cannot be decoupled from the testing conducted.…”

Section: Dbt Temperaturementioning

confidence: 94%

“…As shown in Figure 6, increasing the yield stress of the steel can shift the DBT temperature upward, as can decreasing the brittle fracture stress. [22][23][24][25][26] Therefore, the increase in DBT temperature with increasing Si must be associated with the influence of Si on either the brittle fracture stress or yield stress. The DBT temperature can shift to higher temperatures by increasing a) the yield stress or decreasing the b) fracture stress.…”

Section: Dbt Temperaturementioning

confidence: 99%

“…[4] The reduction in dislocation mobility that often accompanies increases in strength can raise the ductile-tobrittle transition (DBT) temperature (here defined as the temperature at which brittle fracture first appears). [22][23][24][25][26] This shift could potentially contribute to brittle crack initiation in slabs during cooling. In addition, Si is also known to greatly slow tempering in steels.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Si on the Ductile‐to‐Brittle Transition Behavior of As‐Cast Advanced High‐Strength Steels

Giacomin

Bollinger

Komolwit³

et al. 2022

steel research int.

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High Si concentrations in third‐generation advanced high‐strength steels (AHSS) are known to cause cracking in continuous cast slabs during cooling at temperatures below 300 °C. To investigate the mechanism connecting Si to this embrittlement, impact toughness tests are conducted on as‐cast Fe–0.2C–3.0Mn steels with 0.5, 1.5, and 3.0 wt% Si at temperatures between 100 and 400 °C. The propagation path of the cracks through the microstructure of the specimens is examined. The ductile‐to‐brittle transition (DBT) behaviors of the three steels are compared. Higher Si concentrations raise the DBT temperature of the steels. The influence of Si on both solid‐solution strengthening and autotempering during cooling likely contributes to this by increasing the hardness of these as‐cast microstructures. In addition, the precipitation of pro‐eutectoid ferrite (αPE), which is promoted by higher Si concentrations, significantly lowers the upper shelf energy of the DBT curve. The αPE phase also alters the propagation path of brittle fracture in the specimens, potentially contributing to the increase in DBT temperature. The increase in DBT temperature and decrease in upper shelf energy may contribute to the as‐cast AHSS slab embrittlement at low temperatures observed in the industry.

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“…Shearography or speckle pattern shearing interferometry is an NDT technique that uses coherent light or coherent sound waves for the quality assessment of materials in different problems, such as nondestructive testing, strain measurement, and vibration analysis. It has a wide range of applications in the aerospace and wind turbine industries, among other areas [ 5 , 29 , 90 , 91 ]. The shearography techniques present several advantages over traditional NDT techniques, including (1) being capable of testing large area on the structure (up to 1 m 2 per minute [ 92 ]), (2) providing contactless techniques, (3) being relatively insensitive to environmental variations effects, and (4) performing well on honeycomb materials [ 93 ].…”

Section: Shm Of Composite Structuresmentioning

confidence: 99%

Structural Health Monitoring in Composite Structures: A Comprehensive Review

Hassani

Mousavi

Gandomi

2021

Sensors

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This study presents a comprehensive review of the history of research and development of different damage-detection methods in the realm of composite structures. Different fields of engineering, such as mechanical, architectural, civil, and aerospace engineering, benefit excellent mechanical properties of composite materials. Due to their heterogeneous nature, composite materials can suffer from several complex nonlinear damage modes, including impact damage, delamination, matrix crack, fiber breakage, and voids. Therefore, early damage detection of composite structures can help avoid catastrophic events and tragic consequences, such as airplane crashes, further demanding the development of robust structural health monitoring (SHM) algorithms. This study first reviews different non-destructive damage testing techniques, then investigates vibration-based damage-detection methods along with their respective pros and cons, and concludes with a thorough discussion of a nonlinear hybrid method termed the Vibro-Acoustic Modulation technique. Advanced signal processing, machine learning, and deep learning have been widely employed for solving damage-detection problems of composite structures. Therefore, all of these methods have been fully studied. Considering the wide use of a new generation of smart composites in different applications, a section is dedicated to these materials. At the end of this paper, some final remarks and suggestions for future work are presented.

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Glossary of Terms—Failure Analysis and Prevention

Cited by 7 publications

References 0 publications

Yield Strength Enhancement Without Ductility Loss Through Controlling the Intercritical Annealing Time in Medium‐Mn Steels

Yield Strength Enhancement Without Ductility Loss Through Controlling the Intercritical Annealing Time in Medium‐Mn Steels

Effects of Si on the Ductile‐to‐Brittle Transition Behavior of As‐Cast Advanced High‐Strength Steels

Structural Health Monitoring in Composite Structures: A Comprehensive Review

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