Improvement of fracture toughness of Ti+Nb stabilized microalloyed and interstitial free steels processed through single phase regime control multiaxial forging

Ghosh, Sumit; Mula, Suhrit

doi:10.1016/j.msea.2019.138817

Cited by 19 publications

(4 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4a displays a load vs. displacement curve of the MAFed MA and IF steel specimens. The values of apparent fracture toughness could be estimated by calculating the conditional fracture toughness (KQ), equivalent energy fracture toughness (Kee) and Jintegral (crack initiation energy) using the standard equations reported in ref [4]. The values of KQ, Kee and J-integral of the both the MA (KQ Kee, and J values are 78.5, 90 and 97.2MPa√m, respectively) and the IF steel specimens (KQ Kee, and J values are 78.3, 97 and 109MPa√m, respectively) were noticed to increase significantly following the multiaxial forging, as compared to the annealed specimens.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Fracture Toughness and Fatigue Crack Growth Characteristics of UFG Microalloyed and IF Steels Processed by Critical Phase Control Multiaxial Forging

Ghosh

Mula

Somani

et al. 2021

MSF

Self Cite

View full text Add to dashboard Cite

The aim of the current study is to design multiaxial forging (MAF) schedules in order to achieve submicron-grained (<1μm) structure in a microalloyed (MA) steel as well as an interstitial-free (IF) steel, which could impart a good combination of yield strength and tensile ductility. At the same time, an effort has been made to evaluate the fracture toughness characteristics by conducting 3-point bend tests and computing the KQ, Kee and J-integral values of ultrafine grained (UFG) samples and correlating them with the microstructure, besides evaluating the other mechanical properties. Fatigue strength in the high cycle fatigue (HCF) regime were also investigated and fracture mechanisms analyzed and comparison established between differently processed samples. The microstructural analysis was performed using transmission electron microscopy (TEM) and Electron backscatter diffraction (EBSD) and results corroborated with the mechanical properties. Superior combinations of yield strength (YS), ductility (% El.), fracture toughness (Kee) and high cycle fatigue strength (σf) were obtained under certain conditions, i.e., i) MA steel: intercritical (α+γ) phase regime (~Ar1) controlled and 15-cycle multiaxially forged (MAFed) (YS=1027MPa, %El.=8.3%, σf=355MPa and Kee=90MPa√m), and ii) IF steel: ferritic region (<Ar1) controlled 18-cycle MAFed (YS=881MPa, %El.=11.2%, σf=255MPa and Kee=97MPa√m). In the case of MA steel, an enhancement of the fatigue and fracture toughness properties can be ascertained following the formation of uniformly distributed nanosized fragmented cementite (Fe3C) particles (~35nm size) present in the submicron sized (average ~280nm size) ferritic microstructure. In contrast, in the case of IF steel, this is ascribed to the development of submicron sized ferrite grains (average ~320nm) along with a high density of dislocation substructures. These fine dislocation cells/substructures along with the nanosized Fe3C particles could effectively block the initiation and propagation of cracks and thereby enhance the fatigue endurance and fracture toughness of the steel. Superior fracture toughness along with high mechanical properties in submicron-grained condition render the two steels highly useful for high-strength structural applications.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Fig. 1 presents an outline of the MAF processing schedule, whereas a detailed account of the experimental parameters are reported in ref [4].…”

Section: Methodsmentioning

confidence: 99%

Fracture Toughness and Fatigue Crack Growth Characteristics of UFG Microalloyed and IF Steels Processed by Critical Phase Control Multiaxial Forging

Ghosh

Mula

Somani

et al. 2021

MSF

Self Cite

View full text Add to dashboard Cite

show abstract

“…(2), and K H is the Hall-Petch (HP) constant. K H is reported to be 0.11e0.31 MN m À3/2 [27,42,43]. In this study, we have taken this value as 0.3 MN m À3/2 .…”

Section: Samplementioning

confidence: 99%

“…where, M is the Taylor factor (3 for non-textured polycrystalline materials), G is the shear modulus (82 GPa) [27], a ~0.3 is a constant [42,43], b is the Burgers vector, and r d is the dislocation density.…”

Section: Samplementioning

confidence: 99%

Quantitative prediction of yield strength of highly alloyed complex steel using high energy synchrotron X-ray diffractometry

Ghosh

Wang

Singh

et al. 2022

Journal of Materials Research and Technology

Self Cite

View full text Add to dashboard Cite

Thermal Cycling Treatment with Pre-Precipitation to Improve Aging Kinetics of Maraging Steel C-250

Ranaware

2022

J. of Materi Eng and Perform

View full text Add to dashboard Cite

Improvement of fracture toughness of Ti+Nb stabilized microalloyed and interstitial free steels processed through single phase regime control multiaxial forging

Cited by 19 publications

References 44 publications

Fracture Toughness and Fatigue Crack Growth Characteristics of UFG Microalloyed and IF Steels Processed by Critical Phase Control Multiaxial Forging

Fracture Toughness and Fatigue Crack Growth Characteristics of UFG Microalloyed and IF Steels Processed by Critical Phase Control Multiaxial Forging

Quantitative prediction of yield strength of highly alloyed complex steel using high energy synchrotron X-ray diffractometry

Thermal Cycling Treatment with Pre-Precipitation to Improve Aging Kinetics of Maraging Steel C-250

Contact Info

Product

Resources

About