Effect of Quenching-and-Tempering Heat Treatment on Mechanical Properties and Heat-Affected Zone Softening Behavior of Ultra-High Strength Steel

Zhang, Xingping; Li, Chengning; Yang, Xiaobo; Di, Xinjie

doi:10.1007/s11665-023-07993-4

Cited by 2 publications

(1 citation statement)

References 36 publications

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“…However, the process requires long periods of time and often results in limited control due to non-uniform changes in microstructure across the material [7,8]. The other heat treatment methods, such as quenching, tempering, and precipitation hardening, lead to the formation of specific microstructures and enhance hardness and strength [9,10]. These thermal treatments often induce additional thermal stress into the samples and could also lead to severe oxidation under nonvacuum conditions [11,12].…”

Section: Introductionmentioning

confidence: 99%

Room temperature control of grain orientation via directionally modulated current pulses

Rahman,

Oh,

Waryoba

et al. 2023

Mater. Res. Express

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Traditional approaches to control the microstructure of materials, such as annealing, require high temperature treatment for long periods of time. In this study, we present a room temperature microstructure manipulation method by using the mechanical momentum of electrical current pulses. In particular, a short burst of high-density current pulses with low duty cycle is applied to an annealed FeCrAl alloy, and the corresponding response of microstructure is captured by using Electron Backscattered Diffraction (EBSD) analysis. We show evidence of controllable changes in grain orientation at specimen temperature below 28 C. To demonstrate such microstructural control, we apply the current pulses in two perpendicular directions and observe the corresponding grain rotation. Up to 18 of grain rotation was observed, which could be reversed by varying the electropulsing direction. Detailed analysis at the grain level reveals that electropulsing in a specific direction induces clockwise rotation from their pristine state, while subsequent cross-perpendicular electropulsing results in an anticlockwise rotation. In addition, our proposed room temperature processing yields notable grain refinement, while the average misorientation and density of low-angle grain boundaries (LAGBs) remain unaltered. The findings of this study highlight the potentials of 'convective diffusion' in electrical current based materials processing science towards microstructural control at room temperature.

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Section: Introductionmentioning

confidence: 99%

Room temperature control of grain orientation via directionally modulated current pulses

Rahman,

Oh,

Waryoba

et al. 2023

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

Real‐Time Observation of Strain Evolution in Lap Shear Test of BH220 Steel Resistance Spot‐Welded Joints via a Digital Image Correlation Method

Zhao,

Guseinov,

Vdonin

et al. 2024

steel research int.

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This article presents an investigation of the real‐time deformation and strain field changes of baked hardening (BH) 220 steel plate resistance spot welds in the lap tensile shear tests via digital image correlation (DIC) technology. 2D DIC analysis can be used to provide a quantitative assessment of the strain competition between the weld nugget and the surrounding metal. The data obtained from the DIC technique indicate that the shear strain is primarily concentrated in the outer metal of the weld, consistent with a nugget pull‐out failure (PF) mode. In contrast, if the welding parameters are inappropriate, for example, if the welding current is 7.2 kA, the welding time is 10 cycles and the electrode pressure is 0.35 MPa, a significant shear strain appears in the nugget of the BH220 weld. This subsequently causes the weld to fail in an unfavorable interface failure mode in the shear test. Calculations show that if the failure mode is nugget pull‐out, the mean failure strength is 13.5 kN, while the value for interface failure is 6.55 kN. The PF mode is characterized by ductile failure, whereby the material yields and necks through the base material. This failure mode is not associated with the notch region.

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Effect of Quenching-and-Tempering Heat Treatment on Mechanical Properties and Heat-Affected Zone Softening Behavior of Ultra-High Strength Steel

Cited by 2 publications

References 36 publications

Room temperature control of grain orientation via directionally modulated current pulses

Room temperature control of grain orientation via directionally modulated current pulses

Real‐Time Observation of Strain Evolution in Lap Shear Test of BH220 Steel Resistance Spot‐Welded Joints via a Digital Image Correlation Method

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