Investigations into the delayed fracture susceptibility of 34CrNiMo6 steel, and the opportunities for its application in ultra-high-strength bolts and fasteners

Kuduzovic, Asmir; Poletti, María Cecilia; Sommitsch, Christof; Dománková, Mária; Mitsche, Stefan; Kienreich, Robert

doi:10.1016/j.msea.2013.10.019

Cited by 61 publications

(13 citation statements)

References 33 publications

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“…In fact, only surface sorption and desorption can be adequately evaluated using this method [22]. This leads to large variations in activation energy values for the same materials [23][24][25][26].…”

Section: The Most Common Methodsmentioning

confidence: 99%

Calculating the activation energies of nickel, manufactured using 3D printing technology, with multichannel hydrogen diffusion model

et al. 2019

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In modern world more and more materials with extreme properties are being used: high alloys, high-entropy alloys, nanostructured materials, etc. The extreme properties of these materials make them especially sensitive to hydrogen diffusion. Hydrogen can severely impair their properties and cause failures in structures and machines the material is used in. Nowadays, when structures and components are becoming increasingly complex, the use of 3D printing technology is becoming more widespread. Components made using 3D printing technologies are usually layered, which increase the amount of hydrogen that can diffuse into the material. The amount of hydrogen concentration in 3D printed nickel samples has been determined using vacuum heating method in hydrogen analyzer AV-1. The samples were held at different constant temperatures and the total amount of hydrogen extracted at those temperatures was calculated. A mathematic model was developed to evaluate the amount of hydrogen extracted at a given temperature. The evaluation was then compared to the experiment results, and the validity of the mathematical model and the selected hydrogen activation energies was verified.

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Section: The Most Common Methodsmentioning

confidence: 99%

Calculating the activation energies of nickel, manufactured using 3D printing technology, with multichannel hydrogen diffusion model

et al. 2019

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“…The hydrogen embrittlement results in hydrogen-induced delayed fracture, and this tendency for the 1.5 GPa sheets becomes remarkable [13]. The delayed fracture has been mostly studied in the field of ultra-high strength steel bolts and fasteners [14], because the delayed fracture is induced by a high tensile stress acting on tightened ones. Takashima et al [15] examined the hydrogen embrittlement behavior of the ultra-high strength steel sheets under tensile loading and indicated that the tensile stress has a significant effect on the occurrence of delayed fracture.…”

Section: Introductionmentioning

confidence: 99%

Prevention of delayed cracking of punched 1.5 GPa ultra-high strength steel sheets by ironing with punched slug

Mori

Abe

Murai

2020

Int J Adv Manuf Technol

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Hydrogen-induced delayed cracking of punched 1.5 GPa ultra-high strength steel sheets was prevented by ironing with a slug ejected from punching, because the risk of delayed cracking for sheared 1.5 GPa sheets is very high due to high tensile residual stress and large plastic deformation. To prevent the occurrence of delayed cracking, the sheet was punched, and then, the punched hole was ironed by passing the punched slug. Although the residual stress around the punched edge of the 1.5 GPa sheet was tensile, the stress was turned to compressive stress by slug ironing. In addition, the fracture surface of the sheared edge was changed to a smooth ironed surface. A cathode hydrogen charging test of the punched edge for delayed cracking was performed. Although delayed cracks were caused at the punched hole by hydrogen charging, no cracks occurred at the ironed hole for charging. It was found that slug ironing of the punched hole is effective in preventing delayed cracking.

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“…In this study, we focused on 34CrNiMo6 steel, a typical high-strength quenched and tempered steel with medium-carbon low-alloy content, which has been widely used in various industrial fields. Automobile connecting rods, large-scale crankshafts, gear shafts, axles of high-speed railway trains, and forged rotors are the most important applications of this steel [1,2,3]. Such parts often serve under the condition of very strong force and so inevitably encounter service damage.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of 34CrNiMo6 Steel Repaired by Friction Stir Processing

et al. 2019

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Repairing damaged parts using proper repairing methods has become an important means to reduce manufacturing and operational costs and prolong the service life of 34CrNiMo6 steel structures. In the conventional fusion repairing method, welding wire and powder are often used as filling materials. Filling materials are often expensive or difficult to find. Some metallurgical issues (such as solidification crack, higher distortion) were also found with these methods. At the same time, most of the equipment that requires welding wire and powder is expensive. In this study, a new method based on friction stir processing (FSP) was successfully employed to repair 34CrNiMo6 steel, using a block as filling material. Filling blocks are much cheaper than conventional fusion repair consumables. As a result of solid-state repair, this method can also avoid the metallurgical issues of fusion repair. The microstructure and mechanical properties of the repaired samples were investigated using OM (Optical Microscope), SEM, EDS (Energy Dispersive Spectroscopy), XRD, and a Vickers hardness electronic universal tensile tester. The results showed that 34CrNiMo6 steel was successfully repaired by this method, with no defect. Tensile tests showed that the maximum ultimate strength (UTS) was 900 MPa and could reach 91.8% of that of the substrate. The fracture mode of the tensile samples was ductile/brittle mixed fracture. Hence, the repairing method based on FSP appears to be a promising method for repairing castings.

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Investigations into the delayed fracture susceptibility of 34CrNiMo6 steel, and the opportunities for its application in ultra-high-strength bolts and fasteners

Cited by 61 publications

References 33 publications

Calculating the activation energies of nickel, manufactured using 3D printing technology, with multichannel hydrogen diffusion model

Calculating the activation energies of nickel, manufactured using 3D printing technology, with multichannel hydrogen diffusion model

Prevention of delayed cracking of punched 1.5 GPa ultra-high strength steel sheets by ironing with punched slug

Microstructure and Mechanical Properties of 34CrNiMo6 Steel Repaired by Friction Stir Processing

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