Influence of the Heat Treatment on the Microstructure of AISI T15 High Speed Steel

Nogueira, Rejane A.; Ribeiro, Odília C.S.; Neves, Maurício David Martins das; Lima, L.F.C.P.; Filho, Francisco Ambrozio; Friedrich, Delmonte N.; Boehs, Lourival

doi:10.4028/www.scientific.net/msf.416-418.89

Cited by 9 publications

(7 citation statements)

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“…The transverse rupture strength was evaluated only in transverse direction. The samples of the vacuum sintered M3:2 high speed steel were die compacted in a tooling with a pressure of 700 MPa to densities between 6.01 and 6.18 g/cm 3 . The vacuum sintering of the samples were performed under production conditions at 1263 °C for one hour leading to densities of almost 8.16 g/cm 3 (theoretical density of M3:2 high speed steel) and then submitted to heat treatments of annealing and hardening and finally ground to their final dimensions [3].…”

Section: Methodsmentioning

confidence: 99%

Transverse Rupture Strength of M3:2 High Speed Steel Produced through Conventional Casting and Powder Metallurgy Techniques

Filho

Liberati

Monteiro

et al. 2006

MSF

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The main aim of this work is to study the influence of the heat treatment on the transverse rupture strength of three M3:2 high speed steel obtained by differents techniques. PM Sinter 23 obtained by hot isostatic pressing (HIP) of gas atomized powders, a vacuum sintered high speed steel obtained by uniaxial cold compaction and liquid phase sintering of M3:2 water atomized powders and a conventional (cast to ingot and hot work) VWM3C were submitted to hardening in order to determine the influence of this treatment on the transverse rupture strength. The two PM high speed steels and the conventional one were submitted to heat treatment of hardening with austenitizing temperatures of 1140, 1160, 1180 and 1200 °C and tempering at 540 and 560 °C. The effectiveness of the heat treatment was determined by hardness tests (Rockwell C hardness). The microstructure was evaluated by scanning eletronic microscopy (SEM). At least five samples of these three high speed steels were manufactured, austenitized, quenched and tempered as described above and fractured in three point bending tests in order to evaluate the influence of this treatment on the transverse rupture strength (TRS).

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Section: Methodsmentioning

confidence: 99%

Transverse Rupture Strength of M3:2 High Speed Steel Produced through Conventional Casting and Powder Metallurgy Techniques

Filho

Liberati

Monteiro

et al. 2006

MSF

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“…6(b). The hardness of quenched HSS roll is affected not only by the microstructure, but also by the quantities of carbon and alloy elements in the martensite and the residual austenite ( Ref 38,39). When quenched at a lower temperature, there are less carbon and alloy elements dissolved in the austenite.…”

Section: The Role Of Austenitizing Temperature On Structurementioning

confidence: 99%

Investigations on Heat Treatment of a High-Speed Steel Roll

Xing

et al. 2008

J. of Materi Eng and Perform

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High-carbon high-speed steels (HSS) are very abrasion-resistant materials primarily due to their high hardness MC-type carbide and high hardness martensitic matrix. The effects of quenching and tempering treatment on the microstructure, mechanical properties, and abrasion resistance of centrifugal casting highcarbon HSS roll were studied. Different microstructures and mechanical properties were obtained after the quenching and tempering temperatures of HSS roll were changed. With air-cooling and sodium silicate solution cooling, when the austenitizing temperature reaches 1273 K, the metallic matrix all transforms into the martensite. Afterwards, the eutectic carbides dissolve into the metallic matrix and their continuous network distribution changes into the broken network. The second hardening temperature of high-carbon HSS roll is around 793 K. No significant changes in tensile strength and elongation percentage are observed unless the tempering temperature is beyond 753 K. The tensile strength increases obviously and the elongation percentage decreases slightly beyond 753 K. However, the tensile strength decreases and the elongation percentage increases when the tempering temperature exceeds 813 K. When the tempering temperature excels 773 K, the impact toughness has a slight decrease. Tempering at 793-813 K, highcarbon HSS roll presents excellent abrasion resistance.

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“…These coarse primary carbides undergo decomposition, dissolution, transformation, and precipitation during hot deformation, and transform into a more stable form that can be expressed as M 2 C + matrix→M 6 C + MC [6,7,8,9]. Nogueira et al [10] reported that undecomposed reticular carbides could provide routes for crack propagation and make cracks deeper. Zhou et al [11] reported that metastable M 2 C carbides could easily be decomposed into large sizes and uneven distributed carbides during hot deformation, which eventually deteriorates the ductility and impact toughness of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Gleeble-Simulated and Semi-Industrial Studies on the Microstructure Evolution of Fe-Co-Cr-Mo-W-V-C Alloy during Hot Deformation

Luo

Guo

et al. 2018

Materials

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Fe-Co-Cr-Mo-W-V-C alloy is one of the most important materials for manufacturing drills, dies, and other cutting tools owing to its excellent hardness. However, it is prone to cracking due to its poor hot ductility during continuous hot working processes. In this investigation, the microstructure characteristics and carbide transformations of the alloy in as-cast and wrought states are studied, respectively. Microstructural observation and first-principles calculation were conducted on the research of types and mechanical properties of carbides. The results reveal that carbides in as-cast Fe-Co-Cr-Mo-W-V-C alloy are mainly Mo2C, VC, and Cr-rich carbides (Cr7C3 and Cr23C6). The carbides in wrought Fe-Co-Cr-Mo-W-V-C alloy consist of Fe2Mo4C, VC, Cr7C3, and a small amount of retained Mo2C. For these carbides, Cr7C3 presents the maximum bulk modulus and B/G values of 316.6 GPa and 2.48, indicating Cr7C3 has the strongest ability to resist the external force and crack initiation. VC presents the maximum shear modulus and Yong’s modulus values of 187.3 GPa and 465.3 GPa, which means VC can be considered as a potential hard material. Hot isothermal compression tests were performed using a Gleeble-3500 device to simulate the flow behavior of the alloy during hot deformation. As-cast specimens were uniaxially compressed to a 70% height reduction over the temperature range of 1323–1423 K and strain rates of 0.05–1 s−1. A constitutive equation was established to characterize the relationship of peak true stress, strain rate, and deformation temperature of the alloy. The calculated results were in a good agreement with the experimental data. In order to study the texture evolution, the microstructures of the deformed specimens were observed, and an optimal deformation temperature was selected. Using the laboratorial optimal temperature (1373 K) in forging of an industrial billet resulted in uniform grains, with the largest size of 17 µm, surrounded by homogenous spherical carbides.

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Influence of the Heat Treatment on the Microstructure of AISI T15 High Speed Steel

Cited by 9 publications

References 0 publications

Transverse Rupture Strength of M3:2 High Speed Steel Produced through Conventional Casting and Powder Metallurgy Techniques

Transverse Rupture Strength of M3:2 High Speed Steel Produced through Conventional Casting and Powder Metallurgy Techniques

Investigations on Heat Treatment of a High-Speed Steel Roll

Gleeble-Simulated and Semi-Industrial Studies on the Microstructure Evolution of Fe-Co-Cr-Mo-W-V-C Alloy during Hot Deformation

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