Analyzing the influence of a deep cryogenic treatment on the mechanical properties of blanking tools by using the short-time method PhyBaLCHT

Blinn, Bastian; Winter, Sven; Weber, Martin; Demmler, M.; Kräusel, Verena; Beck, Tilmann

doi:10.1016/j.msea.2021.141846

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…It can be seen that the longer the cryogenic time is, the less favorable it is for PAN to form carbon fiber. Considering that DCT mainly adopts the principle of liquid nitrogen vaporization, a trace amount of water vapor [ 26 ] and nitrogen will inevitably enter in the cryogenic modification process, which may cause chain polymerization and other reactions, which will lead to the reappearance of C

N groups.…”

Section: Resultsmentioning

confidence: 99%

Research on the Morphology Reconstruction of Deep Cryogenic Treatment on PtRu/nitrogen-Doped Graphene Composite Carbon Nanofibers

Zhu²,

Wang

et al. 2022

Materials

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To improve the performance of PtRu/nitrogen-doped graphene composite carbon nanofibers, the composite carbon nanofibers were thermally compensated by deep cryogenic treatment (DCT), which realized the morphology reconstruction of composite carbon nanofibers. The effects of different DCT times were compared: 12 h, 18 h, and 24 h. The morphology reconstruction mechanism was explored by combining the change of inner chain structure and material group. The results showed that the fibers treated for 12 h had better physical and chemical properties, where the diameter is evenly distributed between 500 and 800 nm. Combined with Fourier infrared analysis, the longer the cryogenic time, the more easily the water vapor and nitrogen enter polymerization reaction, causing changes of chain structure and degradation performance. With great performance of carbonization and group transformation, the PtRu/nitrogen-doped graphene composite carbon nanofibers can be used as an efficient direct alcohol fuel cell catalyst and promote its commercialization.

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N groups.…”

Section: Resultsmentioning

confidence: 99%

Research on the Morphology Reconstruction of Deep Cryogenic Treatment on PtRu/nitrogen-Doped Graphene Composite Carbon Nanofibers

Zhu²,

Wang

et al. 2022

Materials

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Section: Introductionmentioning

confidence: 88%

“…In our various investigations, it was demonstrated that the cyclic hardening observed in CIT highly depends on different microstructural phenomena, e.g., the size and distribution of precipitates [25][26][27], the dislocation density [28], and the grain size [24]. Moreover, in [26,27], the results obtained in CIT showed a higher sensitivity to microstructural changes than conventional hardness measurements. Accordingly, in another of our own studies [29] on two differently heat-treated Cu-alloyed steels, X0.5CuNi2-2 and X21CuNi2-2, the ranking of the fatigue strength could only be explained by a combined consideration of the hardness and cyclic hardening potential, as conditions with nearly identical hardness showed a significant difference in σ w , depending on their cyclic hardening potential.…”

Section: Introductionmentioning

confidence: 88%

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A New Approach to Estimate the Fatigue Limit of Steels Based on Conventional and Cyclic Indentation Testing

Görzen

Ostermayer

Lehner

et al. 2022

Metals

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For a reliable design of structural components, valid information about the fatigue strength of the material used is a prerequisite. As the determination of the fatigue properties, and especially the fatigue limit σw, requires a high experimental effort, efficient approaches to estimate the fatigue strength are of great interest. Available estimation approaches using monotonic properties, e.g., Vickers hardness (HV), and in some cases the cyclic yield strength, only allow a rough estimation of σw. The approaches solely based on monotonic properties lead to substantial deviations of the estimated σw in relation to the experimentally determined fatigue limit as they do not consider the cyclic deformation behavior. In this work, an estimation approach was developed, which is based on a correlation analysis of the fatigue limit σw, HV, and the cyclic hardening potential obtained in instrumented cyclic indentation tests (CIT). For this, eleven conditions from five different low-alloy steels were investigated. The CIT enable an efficient and quantitative determination of the cyclic hardening potential, i.e., the cyclic hardening exponentCHT eII, and thus, the consideration of the cyclic deformation behavior in an estimation approach. In this work, a strong correlation of σw with the product of HV and |eII| was observed. In relation to an existing estimation approach based solely on HV, considering the combination of HV and |eII| enables the estimation of σw with an enormously increased precision.

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“…In summary, wear directly on the cutting edge of the punch is essential for the life of the punch and the part quality. Most wear tests are conducted on a laboratory scale at very low stroke rates [27] and therefore the results are transferable to industrial applications only to a limited extent. There is still a lack of systematic studies investigating the evolution of the cutting edge radius of different punch materials and the resulting cutting surface quality by punching at very high stroke rates of ultra-high-strength strip steels.…”

Section: Introductionmentioning

confidence: 99%

Punching of Ultra-High-Strength Spring Strips: Evolution of Cutting Edge Radius up to 1,000,000 Strokes for Three Punch Materials

Winter

Richter

Galiev

et al. 2022

JMMP

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Punching of ultra-high-strength spring steel causes critical stresses in the tools. Pronounced wear and even spontaneous failure may occur. Wear of the punches influences the quality of the cutting surfaces of the blanked parts, which is predominantly determined by the cutting edge radius. The radius differs with an increasing number of strokes depending on the punch material. However, there are no studies characterizing the influence of the cutting edge radius on the cutting surface quality on an industrial scale, i.e., considering a very high number of strokes. In the presented study, punches made of high-speed steel, powder metallurgical steel and carbide were used to punch the ultra-high-strength steel 1.4310 (Rm = 1824 MPa) up to 1,000,000 strokes. The experiments were stopped at defined number of strokes, the punches were removed, nondestructively characterized regarding cutting edge radius and wear and reinstalled. It turned out that the radius differed significantly over the number of strokes and, further, varied depending on the punch material. Remarkably, the most low-cost material, precisely the high-speed steel, showed the smallest cutting edge radius of 16 µm and brought the parts with the best cutting surface quality (more than 30% burnish zone) after the maximum number of strokes. The results indicate clearly that the cutting edge radius develops differently for each regarded material and at different number of strokes. Therefore, it is of utmost importance to perform wear tests on different numbers of strokes under industrial conditions. With the knowledge gained, it will be possible to design optimized punches with lower costs and increased lifetime.

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Analyzing the influence of a deep cryogenic treatment on the mechanical properties of blanking tools by using the short-time method PhyBaLCHT

Cited by 6 publications

References 24 publications

Research on the Morphology Reconstruction of Deep Cryogenic Treatment on PtRu/nitrogen-Doped Graphene Composite Carbon Nanofibers

Research on the Morphology Reconstruction of Deep Cryogenic Treatment on PtRu/nitrogen-Doped Graphene Composite Carbon Nanofibers

A New Approach to Estimate the Fatigue Limit of Steels Based on Conventional and Cyclic Indentation Testing

Punching of Ultra-High-Strength Spring Strips: Evolution of Cutting Edge Radius up to 1,000,000 Strokes for Three Punch Materials

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