Characterization of microstructure and tempering response of conventionally quenched, short- and long-time sub-zero treated PM Vanadis 6 ledeburitic tool steel

Jurči, Peter; Dománková, Mária; Hudáková, Mária; Ptačinová, Jana; Pašák, Matej; Palček, Peter

doi:10.1016/j.matchar.2017.10.029

Cited by 43 publications

(65 citation statements)

References 51 publications

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“…The significant effects of appropriate deep cryogenic treatment on the mechanical properties, wear resistance of high-speed steels [5][6][7] and tool steels [8][9][10][11][12][13][14] have been reported in many studies. Podgornik et al [15] investigated the effect of deep cryogenic treatment on the wear resistance of different tool steels, and suggested that the improvement in properties can be related to the formation of finer needle-like martensite and the martensitic transformation accompanied by plastic deformation of primary retained austenite.…”

Section: Introductionmentioning

confidence: 99%

Effects of Deep Cryogenic Treatment on Wear Resistance and Structure of GB 35CrMoV Steel

Yao

Zhou

2018

Metals

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Wear resistance of metallic materials can be effectively improved by the deep cryogenic treatment. In this study, different deep cryogenic treatment conditions were considered, with different soaking durations between quenching and tempering. The main objective is investigating the effects of deep cryogenic treatment and exploring the relationship between the mechanical properties and the microstructure of GB 35CrMoV steel. Hardness and relative wear ratios of samples were evaluated by the Vickers-hardness test and the pin-on-disk wear test, respectively. Worn surface was characterized by a non-contact optical surface profiler. Microstructures were studied by scanning electron microscope (SEM) and X-ray diffraction (XRD). Significant improvements in hardness and wear resistance are observed for higher cryogenic soaking times; the root mean square deviation (RMS) parameter (Sq) was employed to evaluate the effect of deep cryogenic treatment on the worn surface roughness; the improvements were ascribed to the precipitated carbides. The mechanism can be interpreted not only as the promoted effect of deep cryogenic treatment in the decomposition kinetics of martensite, but also as the acceleration on the Ostwald ripening process.

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Section: Introductionmentioning

confidence: 99%

Effects of Deep Cryogenic Treatment on Wear Resistance and Structure of GB 35CrMoV Steel

Yao

Zhou

2018

Metals

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“…Both the tensile tests and the bending tests were carried out using an Instron 5882 (Illinois Tool Works Inc., Norwood, MA, USA) testing machine with an Instron SFL 3119-408 environmental chamber. The same holding time of 30 min at the measurement temperature was used for all samples to avoid any possible artefacts caused by variations of cooling duration [22]. The present results were compared with those obtained under dynamic loading by impact tests of standard V-notch Charpy specimens that were reported in a previous work [21].…”

Section: Methodsmentioning

confidence: 92%

On the Fracture Behavior of a Creep Resistant 10% Cr Steel with High Boron and Low Nitrogen Contents at Low Temperatures

et al. 2019

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An advanced, high chromium, creep-resistant steel was subjected to the tensile tests and three-point bending tests of Charpy V-notch specimens at temperatures of −196 to 20 °C. The steel exhibited ductile fracture under tension tests at all of the temperatures studied. The mechanical properties, i.e., strength and uniform elongation, were enhanced with a decrease in temperature down to −140 °C. Transgranular, dimpled fracture remained the primary fracture mechanism under tension. On the other hand, the results obtained with Charpy V-notch specimens suggested the ductile–brittle transition (DBT). Full embrittlement was observed at temperatures of −60 °C and −150 °C upon impact tests and three-point bending tests, respectively, when the unstable crack started to propagate without remarkable plastic deformation. The DBT temperature of −27 °C for the present steel corresponded to the 28 J impact transition temperature, T28J, when the maximum impact stress matched the maximal true tensile stress.

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“…However, it should be noticed that there is much higher driving force for the martensitic transformation at −196°C, that is, the temperature di erence between the processing temperature and M f is much higher for the treatment in liquid nitrogen than in nitrogen gas at −140°C. Lower c R amount after short time treatment at −140°C, on the contrary, can be explained by the following consideration: Isothermal martensitic transformation, which proceeds during the hold at the lowest processing temperature, is connected with plastic deformation of freshly formed martensite, as demonstrated in [31][32][33]. It is logical to expect that plastic deformation proceeds faster at −140°C than at −196°C, and this can act in favour of more pronounced c R reduction in the early stage of isothermal martensitic transformation.…”

Section: Sem Micrographs Figures 3(a)-3(d)mentioning

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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Characterization of microstructure and tempering response of conventionally quenched, short- and long-time sub-zero treated PM Vanadis 6 ledeburitic tool steel

Cited by 43 publications

References 51 publications

Effects of Deep Cryogenic Treatment on Wear Resistance and Structure of GB 35CrMoV Steel

Effects of Deep Cryogenic Treatment on Wear Resistance and Structure of GB 35CrMoV Steel

On the Fracture Behavior of a Creep Resistant 10% Cr Steel with High Boron and Low Nitrogen Contents at Low Temperatures

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

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