Iterative mesh-based hardness mapping

Brayshaw, W. J.; Roy, Matthew; Sun, Tianzhu; Akrivos, Vasileios; Sherry, Andrew H.

doi:10.1080/13621718.2016.1251713

Cited by 10 publications

(5 citation statements)

References 21 publications

(27 reference statements)

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“…The number of indents were 274 and 685 for the samples arc heat treated 1 and 10 min, respectively. The procedure of hardness mapping is explained by Brayshaw et al [18].…”

Section: Characterization Techniquesmentioning

confidence: 99%

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

et al. 2018

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Super duplex stainless steel (SDSS) weld metal microstructures, covering the complete temperature range from ambient to liquidus, were produced by arc heat treatment for 1 and 10 min. Temperature modeling and thermodynamic calculations complemented microstructural studies, hardness mapping and sensitization testing. After 1 min, intermetallics such as sigma and chi phase had precipitated, resulting in moderate sensitization at 720-840°C. After 10 min, larger amounts of intermetallics resulted in hardness up to 400 HV0.5 and more severe sensitization at 580-920°C. Coarse and fine secondary austenite precipitated at high and low temperatures, respectively: The finer secondary austenite was more detrimental to corrosion resistance due to its lower content of Cr, Mo, and N as predicted by thermodynamic calculations. Increased hardness and etching response suggest that 475°C embrittlement had occurred after 10 min. Results are summarized as time-temperature-precipitation and property diagrams for hardness and sensitization.

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“…The number of indents were 274 and 685 for the samples arc heat treated 1 and 10 min, respectively. The procedure of hardness mapping is explained by Brayshaw et al [18].…”

Section: Characterization Techniquesmentioning

confidence: 99%

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

et al. 2018

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“…The map of hardness showing the distribution of hardness values throughout the surface of the dissimilar weld AISI 420/S355MC is presented in Figure 11 . This map allows to quantify the material properties along the length of microstructurally significant weld zones [ 28 ]. The employed hardness mapping enabled accurate identification of the different welding zones of dissimilar welds and presentation of clear results in all boundary zones.…”

Section: Resultsmentioning

confidence: 99%

Comparative Research of Microstructure and Mechanical Properties of Stainless and Structural Steel Dissimilar Welds

et al. 2021

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The present study utilized a metal inert gas welding (MIG) to make a dissimilar weld of stainless steel AISI 304, 314, 316L, 420 grades and a standard structural steel S355MC. It refers to a weld joining two materials from different alloy systems commonly used in heat exchangers, pressure vessels, and power plant systems. Obviously, maintaining the integrity of such welds is of paramount importance to the safety issues. Therefore, detailed microscopic and experimental studies were performed to evaluate the reliability of these welds. The microscopic analysis did not reveal any presence of weld defects such as porosity or cracks, which ensured that MIG process parameters were properly selected. The performance of dissimilar welds was assessed by hardness and tensile tests. The hardness profiles revealed differences between austenitic and martensitic steel welds that later showed extremely high values in the heat-affected zone (HAZ), which caused fractures in this zone during tensile test. The welds of all austenitic steel grades withstood the tensile test, showing an average tensile strength of 472 MPa with fractures observed in the base metal zone. It made clear that the use of a filler rod 308LSI is suitable only for the austenitic stainless and structural steel dissimilar welds and not appropriate for martensitic-structural steel welds. The achieved results revealed that the higher hardness of the martensitic phase in the HAZ of AISI 420 is closely related with the formation of untempered coarse martensitic structure and higher carbon content.

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“…The load duration varied according to the Ecos Workflow™ software which determines the duration of each indent based on a number of parameters and the results were exported in a spreadsheet for further analysis using Matlab. A code was developed based on the code described by Brayshaw et al [14] where an interpolation method is used between the indentation datapoints and a surface plot is created. Outside the datapoints boundary, the values are normalised to the average hardness value of the dataset and the final plot is trimmed around the boundary.…”

Section: Resultsmentioning

confidence: 99%

Benchmarking of premium rail material wear

Christoforou

Fletcher

Lewis

2019

Wear

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Railway steel that offers a greater quality and extended life is described by the industry as premium rail. It is mainly used on areas of rail networks where accelerated wear, RCF or other rail related damage phenomena prevail. However, little performance data exists for these materials and where it does it is limited to one set of contact conditions. The aim of this work was therefore to map premium rail performance across a range of Tγ contact conditions to benchmark against standard grade R260 rail. Laboratory tests using a twin disc machine were performed to determine the wear performance of four premium rail grades against R8 wheel material, at various slip conditions of 1-20%. The results are shown in terms of Tγ and cyclic wear rate for both the rail and wheel discs. Material hardness mapping was obtained as a comparison between the full rail and the laboratory small scale specimen materials in order to correlate hardness with their wear behaviour. The purpose of this work is to understand the likelihood of wear in different wheel/rail contact conditions and to produce enough wear information for the premium rail that could be used in prediction tools for comparison with other materials and contact conditions.

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Iterative mesh-based hardness mapping

Cited by 10 publications

References 21 publications

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

Comparative Research of Microstructure and Mechanical Properties of Stainless and Structural Steel Dissimilar Welds

Benchmarking of premium rail material wear

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