Scanning precession electron diffraction study of carbide precipitation sequence in low alloy martensitic Cr-Mo-V tool steel

Claesson, Erik; Magnusson, Hans; Hedström, Peter

doi:10.1016/j.matchar.2023.113032

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…Spheroidized carbides can substantially avoid becoming the starting point of cracks, thereby improving the fatigue strength and fracture toughness of the material. V precipitates as carbides between 500 and 700 °C in bainite and martensite and dissolves at 800 °C [30][31][32]. The VC diffraction peak in figure 7 To investigate the precipitation behavior of carbides, the relationship between carbide precipitation and interface binding strength was analyzed using transmission electron microscopy.…”

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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“…The microstructure of the base metal shown in Fig. 2 is formed of a martensitic matrix with primary and secondary carbides [7,16,20].…”

Section: Base Metal Consumables and Welding Proceduresmentioning

confidence: 99%

An investigation on the suitability of different welding recovery procedures for cold stamping punches in VF800AT steel

Pellin,

Israel,

Dalcin

2024

Int J Adv Manuf Technol

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In the present investigation, a procedure was developed to recover VF800AT steel stamping punches by the GMAW process, using Tube-Alloy 260-G, a gas-shielded, metal-cored wire that deposits a martensitic alloy steel. The samples were pre-heated at 450, 500 and 550 °C, and after weld repaired, were submitted to tempering. The samples were characterized before and after the weld repair concerning the macrostructure, microstructure, and microhardness. The correlation of the hardness in the weld metal, heat affected zone and base metal regions with the heat treatments was evaluated statistically by analysis of variance. To experimentally validate this condition, a performance test of the new and weld repaired punches was carried out. Optical microscopy, roughness measurements, and scanning electron microscopy were carried out to evaluate the geometric shape of the radius of the cutting-edge radius and the type of wear acting on the punches.Punches pre-heated to 450 °C and submitted to one tempering step presented the best results, being the most suitable to recover stamping tools made of VF800AT steel by the GMAW process.

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