Relations between fracture toughness, hardness and microstructure of vacuum heat-treated high-speed steel

Leskovšek, Vojteh; Ule, B.; Liščić, Božidar

doi:10.1016/s0924-0136(02)00280-7

Cited by 37 publications

(19 citation statements)

References 22 publications

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“…11. Here it should be noticed that the obtained values of fracture toughness correspond well with those reported by Leskovsek et al [53] for high speed steel without the application of SZT. The open rhombi represent the values obtained on samples without any SZT while the both red-and blue-filled rhombi correspond to microstructures after application of different SZT.…”

Section: Evaluation Of the Szt Effects On Fracture Toughnesssupporting

confidence: 90%

The effect of subzero treatment on microstructure, fracture toughness, and wear resistance of Vanadis 6 tool steel

Sobotová

Jurči²,

Dlouhý

2016

Materials Science and Engineering: A

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Section: Evaluation Of the Szt Effects On Fracture Toughnesssupporting

confidence: 90%

The effect of subzero treatment on microstructure, fracture toughness, and wear resistance of Vanadis 6 tool steel

Sobotová

Jurči²,

Dlouhý

2016

Materials Science and Engineering: A

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“…Despite the fact that in experimental terms such determination is relatively easy, standardized by ASTM and in some cases automated, even the most advanced material databases do not include it. An approximate solution to the above problem is given by considering that the characteristic critical distance, l , for fracture, 28 …”

Section: Fatigue Damage Map: the Stress/crack Length/crack Growth Ratmentioning

confidence: 99%

Fatigue damage discrepancies, the intrinsic fatigue damage map locus and the multiple stages of the similitude concept

Rodopoulos

2010

Fatigue Fract Eng Mat Struct

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A B S T R A C TThe work demonstrates how the theory of the fatigue damage map (FDM) can be used in order to define a closed form locus where fatigue crack growth can be sought. The Intrinsic FDM Locus depending only on readily material properties represents a tool able to accurately predict crack growth of polycrystals. If the Locus is expressed in terms of a surface plot after triangulation of the data, it concludes into visualization of the potential for multiple similitude stages. The stages are defined as a function of the maximum far field stress and K. Multiple similitude stages are found to dominate the short and near threshold area (Stage I growth) and represent direct result of the effect of polycrystalline behaviour to flow resistance. The work concludes that interrogation of the points defining the Intrinsic FDM Locus and related to the three thresholds can provide potential characteristics in the quest for an ideal damage tolerance material.Keywords fatigue damage map; fatigue damage map locus; fatigue life reliability; fatigue property; fatigue threshold; grain size. N O M E N C L A T U R Eb = Burger's vector D = average grain size E = elastic modulus G = shear modulus K Ic = fracture toughness plane strain m i /m 1 = grain orientation factor R = stress ratio R C = stage I intensification factor S = stiffness modulus α = crack length K = stress intensity factor range σ c y = cyclic yield stress σ max FL(R=−1) = maximum value of the fatigue limit, R = −1

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“…Vacuum‐heat‐treatment, on the other hand, allows optimization of the tool steel microstructure, which satisfies ever greater demands on tools and dies properties, particularly in respect of greater fracture toughness while maintaining or even increasing hardness and wear resistance . In this respect hardness and fracture toughness, K Ic , were found as the most suitable parameters when optimizing the final vacuum‐heat‐treatment of tool and high‐speed steels …”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, circumferentially notched and fatigue‐precracked tensile specimen has been found as a very promising alternative, which after fracture can provide additional test specimens. The advantage of the K Ic ‐test specimen (Figure ) lies in the radial symmetry, which makes the specimen particularly suitable for studying the influence of the microstructure on the fracture toughness as well as other properties.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Tool and High‐Speed Steel Properties Using Multi‐Functional K_Ic‐Test Specimen

Podgornik

Leskovšek

2013

steel research int.

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Normally, hardness and fracture toughness are used to determine the influence of vacuum‐heat‐treatment parameters and to optimize it for the specific operating conditions of the tool. However, there are also other tool properties which are equally important and need to be taken into consideration. To determine such a wide range of properties different test procedures and different test specimens are required since none of the standard tests alone is capable of providing relevant properties completely. Currently the best overall appraisal of tool and high‐speed steel applicability seems to be a combination of fracture toughness, bending, or compression testing and in specific cases of impact or small‐punch creep test. This paper clearly demonstrates usability of a single KIc‐test specimen for determination of a wide range of properties being important for tool and high‐speed steels, and their vacuum‐heat‐treatment optimization. In the case of ESR AISI M2 high‐speed steel low tempering and austenitizing temperatures are preferable in terms of ductility and toughness, high tempering and lower austenitizing temperatures in terms of bending strength and high‐speed machinability, while high austenitizing and mid tempering temperatures in terms of hardness, compression strength and grindabillity.

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Relations between fracture toughness, hardness and microstructure of vacuum heat-treated high-speed steel

Cited by 37 publications

References 22 publications

The effect of subzero treatment on microstructure, fracture toughness, and wear resistance of Vanadis 6 tool steel

The effect of subzero treatment on microstructure, fracture toughness, and wear resistance of Vanadis 6 tool steel

Fatigue damage discrepancies, the intrinsic fatigue damage map locus and the multiple stages of the similitude concept

Experimental Evaluation of Tool and High‐Speed Steel Properties Using Multi‐Functional K_Ic‐Test Specimen

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Relations between fracture toughness, hardness and microstructure of vacuum heat-treated high-speed steel

Cited by 37 publications

References 22 publications

The effect of subzero treatment on microstructure, fracture toughness, and wear resistance of Vanadis 6 tool steel

The effect of subzero treatment on microstructure, fracture toughness, and wear resistance of Vanadis 6 tool steel

Fatigue damage discrepancies, the intrinsic fatigue damage map locus and the multiple stages of the similitude concept

Experimental Evaluation of Tool and High‐Speed Steel Properties Using Multi‐Functional KIc‐Test Specimen

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Experimental Evaluation of Tool and High‐Speed Steel Properties Using Multi‐Functional K_Ic‐Test Specimen