Characteristics of 100Cr6 bearing steel after thixoforming process performed with prototype device

Rogal, Łukasz; Czeppe, T.; Bonarski, J.; Olszowska‐Sobieraj, B.

doi:10.1016/s1003-6326(10)60626-7

Cited by 19 publications

(9 citation statements)

References 20 publications

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“…Praveen et al [37] obtained a hardness of 1050 HV in the same alloy, consolidated using SPS, however, they applied different milling and sintering conditions, which could have resulted in higher hardness. It should be noted that the value of CS obtained in the present study is one of the highest values listed in the literature on HEAs and is similar to WC-Co systems [69]. This is due to a unique microstructure, which consists of a mixture of nanometer grains of the BCC solid solution, Cr supersaturated in Fe and Ni particles and carbides.…”

Section: Mechanical Property Analysissupporting

confidence: 71%

“…This influenced the mechanical stability of the FCC phase and its susceptibility to transform into martensite [50,64]. For example, in austenitic steels the γ−ε transformation occurs in the presence of a large stress, which leads to the formation of a large number of defects, such as dislocations and stacking faults in the deformed austenite, leading to strengthening of the material during deformation [58,[65][66][67][68][69]. The mechanism of deformation, accompanied by the martensite formation observed in the stainless steel, has also been reported in Hadfield steel, a high-Ni alloy and TRIP steel [15].…”

Section: Mechanical Property Analysismentioning

confidence: 99%

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Microstructure and Mechanical Properties of Al–Co–Cr–Fe–Ni Base High Entropy Alloys Obtained Using Powder Metallurgy

et al. 2019

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Four different compositions of high entropy alloys based on Al-Co-Cr-Fe and Al-Co-Cr-Fe-Ni systems were prepared using mechanical alloying and consolidation by spark plasma sintering. The chemical compositions of the studied alloys were experimentally selected to obtain a BCC solid solution and mixtures of BCC with FCC. The microstructure of the Al25Co25Cr25Fe25 (all in at%) high entropy alloy consisted of a matrix with a high concentration of Al, Co and Fe, in which spherical grains (50-200 nm) enriched in Cr were embedded. Both the matrix and grains had body centered cubic structures. The addition of nickel to a four-element system led to the formation of a multiphase composition. The microstructure of the Al20Co20Cr20Fe20Ni20, Al10Co30Cr20Fe35Ni5 and Al15Co30Cr15Fe40Ni5 HEAs consisted of fine grains measuring 50-500 nm composed of: AlNi-B2, BCC phase, FCC or BCC solid solutions and σ-sigma phase, respectively. The complex structure of the studied samples resulted in changeable mechanical properties. The highest compression strength of 3920 MPa was accompanied by an increased yield strength of 3500 MPa, and a low strain of 0.7%, for the Al25Co25Cr25Fe25 alloy. The addition of Ni led to the formation of plastic FCC phases responsible for a decrease in strength with increases in ductility, which, in the new non-equiatomic Al10Co30Cr20Fe35Ni5 high entropy alloy reached 6.3% at a yield strength of 1890 MPa and compression strength of 2230 MPa. The conducted abrasion studies revealed that non-equilibrium high entropy alloys have the highest abrasion resistance.

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Section: Mechanical Property Analysissupporting

confidence: 71%

Section: Mechanical Property Analysismentioning

confidence: 99%

Microstructure and Mechanical Properties of Al–Co–Cr–Fe–Ni Base High Entropy Alloys Obtained Using Powder Metallurgy

et al. 2019

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“…From the lattice distances and their mutual angles measured using FFT, the ferrite/martensite [1][2][3][4][5][6][7][8][9][10][11] zone axis orientation was identified, which fitted well to the simulation of the reciprocal lattice section at that orientation. Additional less visible reflections (marked with arrows) probably from M 3 C or transitional carbides [26][27][28][29] (lattice distance 0.26 nm and angle 36°) visible. The inverse FFT obtained using Digital Micrograph software by applying masks near reflections in the FFT showed much better contrast as can be seen in Fig.…”

Section: Microstructural Stability As a Function Of Production Methodsmentioning

confidence: 99%

Melt-spinning and semi-solid processing of bainitic steel

Rogal

Solano-Alvarez

Bhadeshia

2017

Materials Science and Technology

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A steel with a chemical composition meant to form nanostructured bainite following appropriate heat treatment, was cooled rapidly from the liquid phase (1550 °C) using melt spinning and modified injection-suction methods, as well as from a semi-solid temperature (1430 °C) through thixoforming. The hardness of the as-cast melt-spun ribbons was ~900 HV due to a fine martensite-austenite mixture surrounded by 3-dimensional skeleton-like primary carbides of length scale 0.2-0.3 µm. The suction-injection cast method led to a similar structure but less hard (780 HV) due to a lower cooling rate. The thixoformed material showed unmelted globular fine grains and a eutectic mixture formed directly from the liquid phase. The variety of processed steel samples were tempered and their microstructures examined.

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“…properties of as-processed SSM are poor due to their initial austenitic structure [16]. A heat treatment like tempering or hardening and subsequent tempering was used to improve their mechanical properties [20][21][22][23][24]. A new approach, which enables to obtain the heat treated thixo-cast in a single technological step, consists in combining the thixoforming process followed by controlled cooling to bainitic temperatures including isothermal holding, which was proposed by Rogal et al in [25].…”

Section: " "mentioning

confidence: 99%