Characterization of the precipitation behavior and resulting mechanical properties of copper-alloyed ferritic steel

Schwich, Hannah; Görzen, David; Blinn, Bastian; Beck, Tilmann; Bleck, Wolfgang

doi:10.1016/j.msea.2019.138807

Cited by 20 publications

(13 citation statements)

References 23 publications

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Section: Introductionmentioning

confidence: 87%

“…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: 87%

“…As a steeper slope of the h a,p -N curve indicates a more pronounced cyclic hardening, e II is used to quantify the cyclic hardening potential of the investigated material and, thus, is called the cyclic hardening exponent CHT . A steeper slope of the curve, which is described by a higher absolute value of the exponent |e II |, indicates a higher cyclic hardening potential, i.e., a higher capacity to counteract local stress concentrations [23,24,26,29]. As already discussed in the introduction, the fatigue strength relates to the cyclic hardening potential and, thus, |e II | is considered for the correlation analyses.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 87%

Section: Mechanical Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…Furthermore, by using CITs, Kramer et al [15] demonstrated that the cyclic hardening potential of 18CrNiMo7-6 increases with decreasing grain size. Moreover, Schwich et al [24] showed an interrelation of the cyclic deformation behavior determined in CITs and the morphology of nanoscaled Cu precipitates in a Cu-alloyed steel with 0.005 wt.% C.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Influence of Process Parameters on the Mechanical Properties of Extruded Aluminum Tubes by Cyclic Indentation Tests

Görzen

Schäfke

Blinn

et al. 2021

Metals

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Given the complex process condition, extruded aluminum (Al) alloy tubes show locally pronounced differences in microstructure and mechanical properties, which can be influenced by subsequent heat treatment. In the present study, cyclic indentation tests (CITs) were conducted on extruded Al alloy EN AW-6082 to locally determine hardness and cyclic hardening potential, which was complemented with light optical microscopy. To analyze the influence of extrusion process and subsequent heat treatment, the EN AW-6082 tubes investigated were manufactured with extrusion ratios Ψ of 13:1 and 22:1, both in as-extruded and T6 heat-treated conditions. The results obtained for the as-extruded state showed significant differences of the local mechanical properties and demonstrated that an increased Ψ leads to higher hardness, caused by more pronounced plastic deformation during the manufacturing process. Moreover, an increase of hardness and cyclic hardening potential was observed after a T6 heat treatment, which also reduced the difference in hardness between the different extrusion ratios. Additionally, the pronounced local differences in hardness and cyclic hardening potential correlated with the local microstructure. The results demonstrated that CITs enable the analysis of local mechanical properties of extruded EN AW-6082 profiles, resulting from different extrusions ratios as well as subsequent heat treatment.

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“…Goodman (Ref 8 ) reported that the precipitated particle consisted of approximately 50% copper at the early stage of annealing, and the minimum size of precipitated particles was less than 1 nm. Schwich (Ref 9 ) reported that nanometer-sized Cu-rich precipitates had radius of 2.2 and 2.4 nm after aging at 600 °C for 120 s and 720 s, respectively. At a longer aging time of 7200 s, the pure Cu precipitate exhibited coarsening.…”

Section: Introductionmentioning

confidence: 99%

Morphology and Antibacterial Properties of Copper Precipitates in Ferrite Stainless Steel

Yin

et al. 2021

J. of Materi Eng and Perform

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Characterization of the precipitation behavior and resulting mechanical properties of copper-alloyed ferritic steel

Cited by 20 publications

References 23 publications

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

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

Investigating the Influence of Process Parameters on the Mechanical Properties of Extruded Aluminum Tubes by Cyclic Indentation Tests

Morphology and Antibacterial Properties of Copper Precipitates in Ferrite Stainless Steel

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