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

Sobotová, Jana; Jurči, Peter; Dlouhý, Ivo

doi:10.1016/j.msea.2015.11.078

Cited by 71 publications

(68 citation statements)

References 35 publications

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“…A very interesting fact was found for the material tempered at the temperature of secondary hardening -K IC was higher for the SZT material. This is in good agreement with the recently published results where a similar tendency was found for the same SZT steel treated for 4 h and 10 h. 7 One can say that this kind of K IC behaviour can be expected because of the lower hardness of the SZT steel when tempered in this temperature range; however, in the mentioned paper, it was also found that the increase of K IC is accompanied with a better wear performance of the material, due to the presence of a higher amount of carbides. The enhanced number of carbides, compared to the material after the conventional quenching, was also identified in the current work.…”

Section: Evaluation Of the Szt Effect On The Fracture Toughnesssupporting

confidence: 93%

“…In our recent paper, it was demonstrated that the effect of the SZT on the toughness is marginal, but the effect of this processing on K IC is rather positive when the material is tempered at the temperature normally used for secondary hardening. 7 The main goal of the current investigations is to characterize the variations in the toughness and fracture toughness of powder-metallurgy (PM) ledeburitic steel Vanadis 6, as a result of different heat-treatment schedules (austenitizing, sub-zero treatment, tempering) and to relate them to the microstructural alterations, due to these treatments, like the reduction of the retained-austenite amount, increase in the carbide count and others. [8][9][10] …”

Section: Introductionmentioning

confidence: 99%

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Fracture toughness of ledeburitic Vanadis 6 steel after sub-zero treatment for 17 h and double tempering

Ptačinová¹,

Jurči²,

Dlouhý³

2017

Mater. Tehnol.

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The influence of sub-zero treatment on the fracture toughness of Cr-V ledeburitic steel Vanadis 6 was examined, in comparison with the same material processed without the sub-zero period. The microstructure of the material consists of the matrix and several types of carbides -eutectic carbides (ECs), secondary carbides (SCs) and small globular carbides (SGCs). Small amounts of retained austenite were also present in the microstructure, but only in the untempered or low-temperature tempered steel. Sub-zero treatment increases the amount of small globular carbides. On the other hand, tempering results in a decrease in the population density of these particles. The fracture toughness of conventionally heat-treated steel firstly increases with the tempering, but then it decreases rapidly when the steel is tempered at the temperature of secondary hardening. In the case of the sub-zero treated material, the fracture toughness is correspondingly lower when the material is tempered at low temperatures, but it becomes slightly higher in the temperature range normally used for secondary hardening. Generally, one can say that the fracture toughness follows well the values of the hardness of the material, except in the narrow temperature range in the case of the sub-zero treated steel, where a "window" for a simultaneous enhancement of hardness and toughness exists. Keywords: ledeburitic steel, sub-zero treatment, fracture toughness, carbides, fracture surface Avtorji so preu~evali vpliv standardne toplotne obdelave v kombinaciji s podhlajevanjem na lomno`ilavost Cr-V ledeburitnega jekla Vanadis 6 v primerjavi z enakim materialom brez podhlajevanja. Mikrostruktura materiala sestoji iz matrice in ve~vrst karbidov -evtekti~nih karbidov (angl. ECs), sekundarnih karbidov (angl. SCs), in manj{ih globularnih karbidov (angl. SGCs). Majhne koli~ine zaostalega avstenita so bile prisotne v mikrostrukturi, vendar le v nepopu{~enem ali v nizkotemperaturnopopu{~enenem jeklu. Podhlajevanje pove~uje koli~ino manj{ih globularnih karbidov. Po drugi strani pa se s popu{~anjem zmanj{uje populacijska gostota teh delcev. Lomna`ilavost konvencionalno toplotno obdelanega jekla se najprej pove~uje s povi{evanjem temperature popu{~anja vendar se pri~ne hitro zmanj{evati (zni`evati), ko je prekora~ena temperatura sekundarnega utrjevanja. Pri toplotni obdelavi materiala s podhlajevanjem, se lomna`ilavost posledi~no zni`uje, ko je le-to popu{~eno na ni`jih temperaturah, vendar se rahlo pove~uje v obmo~ju temperature, ki se navadno uporablja za sekundarno utrjevanje. V splo{nem je mo`no re~i, da lomna`ilavost sledi vrednostim trdote materiala, razen v primeru toplotno obdelanega jekla v kombinaciji s podhlajevanjem, kjer v zelo ozkem temperaturnem intervalu obstaja "temperaturno okno". Tam dose`emo isto~asno pove~anje`ilavosti in trdote.

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Section: Evaluation Of the Szt Effect On The Fracture Toughnesssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Fracture toughness of ledeburitic Vanadis 6 steel after sub-zero treatment for 17 h and double tempering

Ptačinová¹,

Jurči²,

Dlouhý³

2017

Mater. Tehnol.

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“…This result is in good agreement with the results of previous works. 7,15 As expected, the hardness of steel Vanadis 23 is 1-2 HRC higher than the hardness of steel 1.2379 (Figure 2).…”

Section: Resultssupporting

confidence: 76%

“…15,16 On the contrary, D. Das 8 concluded that both the bulk hardness and the apparent hardness of the matrix increase with the decreasing temperature of cryogenic treatments of the C/M 1.2379 steel, and that the degree of influence of cryogenic treatment on the hardness is dependent on the parameters of the heat treatment (the temperature and time of austenizing and tempering) as well as the rate of cooling, depth of cryogenic treatment and holding time. However, it should be noted that in his case, low-temperature tempering was used.…”

Section: Resultsmentioning

confidence: 99%

Study of the properties and structure of selected tool steels for cold work depending on the parameters of heat treatment

Kuřík¹,

J²,

Vlach³

et al. 2017

Mater. Tehnol.

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Tool steels produced with powder metallurgy (P/M) are perspective materials, although they are more expensive in comparison with tool steels produced with the conventional method. The work focuses on the study of mechanical properties and structure depending on the heat-treatment conditions for the two tool steels. These are the 1.2379 steel for cold work produced with classical metallurgy and high-speed P/M steel Vanadis 23. Both materials were heat treated in the conventional manner to achieve a hardness of 61 HRC. They were also exposed to a cryogenic treatment at temperatures of -90°C and -196°C for 4 h between the hardening and the tempering. We evaluated the hardness and strength using the three-point-bending test and the wear resistance using the pin-on-disk method. Keywords: powder metallurgy, high-speed steels, heat treatment, cryogenic treatment, wear rate Orodna jekla, proizvedena s postopki metalurgije v prahu (angl. P/M) so perspektivni materiali, kljub temu da so dra`ji od tistih izdelanih s konvencionalno metodo. Delo je osredoto~eno na {tudijo mehanskih lastnosti in strukturo, v odvisnosti od pogojev toplotne obdelave za ti dve vrsti orodnih jekel. To so jekla 1.2379 za delo v hladnem, proizvedena s klasi~nimi metalur{kimi postopki in hitrorezno P/M jeklo Vanadis 23. Oba materiala sta bila toplotno obdelana s konvencionalnimi postopki, glede na njuno sestavo, tako, da sta dosegli trdnost 61 HRC. Bili sta tudi izpostavljeni obdelavi s podhlajevanjem pri temperaturah od -90°C in -196°C za 4 h med strjevanjem in temperiranjem. Trdnost je bila ocenjena pri trito~kovnem mehanskem testu (zvijanje) in s testom obrabe po metodi pin-on-disk. Klju~ne besede: metalurgija prahov, visokorezna jekla, toplotna obdelava, obdelava s podhlajevanjem, stopnja obrabe

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“…e toughness and fracture toughness are, however, worsened [23], except the cases where the steels are high-temperature tempered [24,25].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Hardness of Cold Work Vanadis 6 Steel after Subzero Treatment at −140°C

Ďurica

Ptačinová

Hudáková

et al. 2018

Advances in Materials Science and Engineering

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e microstructure, phase constitution, and hardness of Cr-V ledeburitic tool steel Vanadis 6 subjected to subzero treatment at −140°C and for different soaking times have been investigated. e light microscopy, scanning electron microscopy, and X-ray diffraction have been used for microstructural investigations. e hardness has been evaluated by the Vickers method. e obtained results assist to draw that subzero treatment reduces the retained austenite amount and increases the population density of carbides, compared to conventional heat treatment. e extent of decrease in the retained austenite amount makes around 85%, and the increase in population density of small globular carbides was approximately fivefold. High compressive stresses were identified in the retained austenite, and their values follow the increase in carbide count. is makes a serious support to the theory explaining the formation of "extra" carbides as a by-product of more complete martensitic transformation. As a result of the mentioned microstructural changes, the material hardness increased from 875 ± 16 HV 10 up to 954.6 ± 14 HV 10 for conventionally quenched and SZT steels, respectively.

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

Cited by 71 publications

References 35 publications

Fracture toughness of ledeburitic Vanadis 6 steel after sub-zero treatment for 17 h and double tempering

Fracture toughness of ledeburitic Vanadis 6 steel after sub-zero treatment for 17 h and double tempering

Study of the properties and structure of selected tool steels for cold work depending on the parameters of heat treatment

Microstructure and Hardness of Cold Work Vanadis 6 Steel after Subzero Treatment at −140°C

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