The Synergistic Effects of Boron and Impression Creep Testing during Paced Controlling of Temperature for P91 Steels

Ахтар, Модассир; Khajuria, Akhil

doi:10.1002/adem.202300053

Cited by 29 publications

(3 citation statements)

References 47 publications

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“…Full width at half maximum (FWHM) is directly associated with dislocation density, i.e. peak broadening is due to increase in dislocation density [28,29]. At temperatures between 500 °C-550 °C, the FWHM variation is not pronounced.…”

Section: Type Of Carbide After Temperingmentioning

confidence: 99%

Carbide precipitation during tempering of hybrid steel 60

Zheng,

Lei,

Huang

et al. 2024

Mater. Res. Express

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The effects of carbide precipitation on mechanical performance of Hybrid Steel 60, known as a novel bearing steel, have not been investigated. In this study, the austenite transformation temperatures of Hybrid Steel 60 during heating were revealed by the thermal expansion curve. The temperature and effective activation energy of the second phase precipitation were determined by the differential scanning calorimetry (DSC) curve. Different solid solution structures after austenitization were detected using various cooling rates. The solubility temperature was determined based on hardness and residual austenite content. The carbides precipitated at the peak temperature were qualitatively identified using XRD. It was discovered that the temperature points Ac1 and Ac3 of the steel were 786 ℃ and 864 ℃, respectively. In addition, the effect of solid solution temperature on quenching hardness is minimal, while the cooling rate has a greater impact on hardness, reaching a peak at 5 ℃/s. The primary carbide phase in Hybrid Steel 60 is the M7C3 and VC. When the temperature ranges from 500 ℃ to 550 ℃, M23C6 begins to precipitate. As a result, after tempering at 525 ℃, the hardness peak value reached 566 HV.

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Section: Type Of Carbide After Temperingmentioning

confidence: 99%

Carbide precipitation during tempering of hybrid steel 60

Zheng,

Lei,

Huang

et al. 2024

Mater. Res. Express

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show abstract

“…Mishra et al 15 believed that boron would improve the strain hardening during high tempering temperature, mainly owing to the delay in lath recovery and structure refinement. The study of Akhtar et al 16 showed that the activation energy and creep life of boron modified P91 steel were improved. The grain boundary hardening was enhanced 17 and the recovery phenomenon was delayed through appropriate post weld heat treatment 18 and addition of boron, which improved the creep strength 19 and suppressed the failure of weld joints in the intercritical heat-affected zone of P91 steel.…”

Section: Introductionmentioning

confidence: 99%

Effect of boron on microstructure and mechanical properties of Al-killed high-strength low-alloy steel

Huang,

Li,

Zang

2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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Through the application of experimental analysis and mechanical characterisation, the influence of boron on the microstructure, strength and impact toughness of Al-killed high-strength low-alloy steel was examined. The results showed that with increasing boron content, the area fraction and average size of martensite–austenite constituents increased by 11.8% and 2.04 μm, respectively. Owing to the strengthening and combining effects of boron, the proportion of low angle grain boundaries in the boron-containing steel increased from 67.94% to 79.41% in comparison to the boron-free steel. After adding 0.0014% boron, the tensile and yield strength increased by 14.65% and 3.66%, respectively, due to the increasing content of martensite–austenite constituents. The long strip and large-sized martensite–austenite constituents of the steel matrix with 0.003% boron easily became the source of cracks and facilitated crack propagation, resulting in a decrease in strength. The toughness tested at −20 °C of the steel was severely worsened after adding boron, and the impact absorbed energy decreased from 105 to 7.4 J. This was because boron increased the martensite–austenite constituents, low angle grain boundaries and random boundaries, which favoured crack generation and propagation during the impact process, resulting in a sharp deterioration of toughness.

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“…The experiments were carried out by machining the composite in Die sinking EDM. Akhtar, & Khajuria (2023) carried out the detailed study of the grain structure and the metrological properties due to the different conditions. The normalized and tempered condition properties were evaluated and the modifications occurring in the grain boundaries were studied in the work.…”

Section: Introductionmentioning

confidence: 99%

Wire Electric Discharge Machining of Aluminium Hybrid Composite: Renewable Energy Based IoT Approach

Hariharan,

Marimuthu,

Sundaresan

et al. 2023

JCST

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Wire Electric Discharge Machining (WEDM) has been recognized as one of the optimum methods for machining of harder aluminum-based hybrid metal matrix composites (AHMMC). This method is used to optimize the major control aspects of a machine and they are current, pulse duration, and rate of feed of wire on kerf width (KRW) and Surface roughness (Ra) of hybrid composites made of aluminum Al6351 as the metal matrix (AMMHC). The AMMHC has been created via a stir casting technique by adding SiC and B4C with an Al6351 matrix. Box-Behnken design (BBD) has been used to conduct tests in order to parametrically optimize the WEDM process. The optimization of KRW and Ra is identified using 3-D surface plots, graphs and response table of ANOVA as well as by employing Response Surface Methodology (RSM). Internet of Things (IoT) is implemented to monitor the quality of electrolyte that is used in WEDM. It has been identified that the current has a major contribution in both KRW and Ra factors. A lower current is preferred for a lower KRW whereas higher current improves Ra value.

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The Synergistic Effects of Boron and Impression Creep Testing during Paced Controlling of Temperature for P91 Steels

Cited by 29 publications

References 47 publications

Carbide precipitation during tempering of hybrid steel 60

Carbide precipitation during tempering of hybrid steel 60

Effect of boron on microstructure and mechanical properties of Al-killed high-strength low-alloy steel

Wire Electric Discharge Machining of Aluminium Hybrid Composite: Renewable Energy Based IoT Approach

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