Development of New HSS Roll with High Heat Crack Resistance by Reinforced Carbides.

Ichino, Kenji; Koseki, Tomoya; Toyooka, Takaaki; Hiraoka, Haruo; Kataoka, Yuki

doi:10.2320/materia.39.181

Cited by 10 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5) Therefore, composition of HSS with 1.9%-2.0% for carbon equivalent, 10%-11% for tungsten equivalent (W eq = W + 2Mo), and 5%-6% for vanadium has been recommended for the manufacture of roller. 6) As the density (kg•m − 3 ) difference between W 2 C(17 200), WC(15 800), Mo 2 C(9 100), VC(5 700), Fe 3 C (7 200) and residual molten steel (about 7 800) is huge, 7) the vanadium carbides always located at the inner layer of a shell and the tungsten carbides at the outer layer of the shell under the action of centrifugal force during centrifugal casting process. In order to prevent segregation, decreasing W and Mo contents and adding a suitable amount of Nb to form (V, Nb)C composite carbide of a density near to that of molten steel can be used to decrease the gravity difference between VC and residual molten steel.…”

Section: Introductionmentioning

confidence: 99%

Carbide Characteristics of High Vanadium High-speed Steel Manufactured by Electroslag Remelting

et al. 2022

View full text Add to dashboard Cite

The carbide characteristics of high vanadium high-speed steel (W3Mo4Cr5V6) manufactured by electroslag remelting (ESR) are analyzed by field emission scanning electron microscopy (FESEM), electron probe microanalysis (EPMA) and micro-Vickers. The results illustrate that three types of carbides are mainly formed in W3Mo4Cr5V6 which includes the lumpy and strip-like MC in the intracrystalline, lamellar M 2 C at grain boundary with discontinuous network and globular secondary carbides dispersed in matrix, among these, the eutectic strip-like MC occupies the main part. The more uniform distribution and finer size for both MC and M 2 C are obtained with high solidification rate (SR). Both 2D and 3D morphologies of MC carbides show obvious symmetry with clustered distribution and various shapes. The MC and M 2 C are rich in V and Mo, W respectively, the compositional characteristics are not only related to the carbide type and morphology, but also the precipitation order and distribution density. The Vickers hardness of primary MC, eutectic MC and M 2 C are measured and the average values are 2 205 HV, 850 HV and 896 HV respectively which includes the adverse effects of soft matrix on the test results of hard carbides. A new and exact test method for pure carbides should be developed in the future.

show abstract

Section: Introductionmentioning

confidence: 99%

Carbide Characteristics of High Vanadium High-speed Steel Manufactured by Electroslag Remelting

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Many studies have been done to improve roll performance in the past decades. The bimetallic roll is one of the most important developments to resolve above problem . Among them, high speed steel (HSS) is widely used in the bimetallic roll as shell material.…”

Section: Introductionmentioning

confidence: 99%

“…During heat treatment, residual stress is inevitably introduced due to temperature gradient and phase transformation . The residual stress is self‐equilibrating within the roll, independent of the any external loads.…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Simulation for Hot Strip Bimetallic Roll during Quenching

Noda

Sano

et al. 2016

steel research int.

View full text Add to dashboard Cite

Bimetallic rolls are widely used in hot rolling mills because of excellent hardness, wear resistance, and high temperature properties. Considerable residual stresses are produced for the bimetallic roll during quenching. Moreover, severe thermal stresses are caused by heating-cooling thermal cycles during subsequent hot rolling process. Fracture from the roll center may occur due to the residual stress adding to the thermal stress, and therefore, it is desirable to investigate the residual stress to improve roll service life. Therefore, FEM simulation of the bimetallic roll is performed for the quenching process. It should be noted that a large number of experimental data of the core and shell material are utilized for the wide range of temperature considering the quenching. The generation mechanism for the residual stress is discussed focusing on the effect of temperature gradient and phase transformation. Furthermore, the effects of shell-core ratio and diameter on residual stress are considered. Results show that the residual stress only slightly increases with increasing shell-core ratio, while significantly increases with increasing diameter.

show abstract

“…For the work rolls in the hot strip mill in a steel plant, the high-speed steel that has an excellent wear resistance has been used (7) . However, there are problems such as an increase of the roll regrinding quantity and restriction of the rolling quantity due to the generation of a surface roughness that results in the pitching of the roll surface by growth and generation of heat cracks in the roll surface.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Evaluation of Heat Crack Initiation Condition Under Thermal Shock

Sonoda

Kashiwagi

Hamada

2008

JMMP

View full text Add to dashboard Cite

In this paper, we have proposed an evaluation method for the initiation conditions of heat crack under thermal shock using the tensile test of a notched specimen. In some materials, such as hot rolling rolls and dies for aluminum die-casting, there is a problem of heat crack initiation, and the evaluation of heat crack resistance using test pieces was difficult until now. The thermal stress and stress gradient that occurred in such material were analyzed by the finite element method (FEM). The maximum stress when tensile stress was applied to the material with a notch was compared to the stress gradient of the thermal stress. As a result, the quantitative evaluation during the initiation conditions of a heat crack for materials became possible.

show abstract

Development of New HSS Roll with High Heat Crack Resistance by Reinforced Carbides.

Cited by 10 publications

References 0 publications

Carbide Characteristics of High Vanadium High-speed Steel Manufactured by Electroslag Remelting

Carbide Characteristics of High Vanadium High-speed Steel Manufactured by Electroslag Remelting

Residual Stress Simulation for Hot Strip Bimetallic Roll during Quenching

Quantitative Evaluation of Heat Crack Initiation Condition Under Thermal Shock

Contact Info

Product

Resources

About