Influence of Secondary Precipitations in Fe-Based MMCs on High Temperature Wear Behaviour

Winkelmann, H.; Varga, M.; Badisch, E.

doi:10.1007/s11249-011-9798-2

Cited by 14 publications

(9 citation statements)

References 30 publications

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“…To show the influence of the velocity, 10 mm/min and 1 mm/s were used at all temperatures. Also hot hardness measurements with Vickers-method and 10 kg load (HV10) were performed at several temperature levels (RT, 100, 300, 500, 600, 700, 800°C), revealing material hardness decrease due to thermal softening [2,4,5]. …”

Section: High Temperature Scratch Test (Ht-st)mentioning

confidence: 99%

“…At higher velocities more cracking and micro breaking can occur, which gets worse at higher temperatures, as visible in some loading cases at metal matrix composites and wear resistant cast irons [12,14]. At higher temperatures, wear mechanisms are exacerbated -the deformation WIT Transactions on Engineering Sciences, Vol 90, www.witpress.com, ISSN 1743-3533 (on-line) increases due to material softening; material transfer enhances more instable scratch behaviour and the wear reducing effect of carbides is decreased [4,15].…”

Section: Microscopical Evaluations and Micro Hardness Measurementsmentioning

confidence: 99%

“…Due to the lack of knowledge on the influence of temperature and scratching velocity in abrasive contacts on these mechanisms, this study was performed. Increasing temperature leads to microstructural changes resulting in a hardness decrease [4,5]. Changes of the mechanical properties can be beneficial as well -wear can be accelerated due to a hardness drop, but can also be reduced by the formation of mechanically mixed layers, which is known in abrasive environments especially at high temperatures [5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The role of temperature and velocity on deformation and wear mechanisms in fundamental abrasive contacts up to 800°C

Rojacz¹,

Varga²

2015

Materials Characterisation VII

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Abrasion of metallic materials, especially at elevated temperatures, is a complex process with many influencing factors which ultimately lead to material loss in many applications. This work focus on the investigation of deformation and wear mechanisms present during a single abrasive event. Thereto the scratch behaviour of different steels were studied under variation of different parameters like temperature, which influences microstructural changes and a concomitant hardness drop, and velocity, which strongly affects the hardening mechanisms within the deformed areas. Both parameters influence the resistance against a penetrating abrasive. Therefore a high temperature scratch test (HT-ST) was developed, which enables scratch testing from 1-100 N and temperatures up to 1000°C. Within this study a diamond frustum with a tip radius of 200 µm was chosen as indenter. Scratch tests were performed at room temperature, 500°C and 800°C. Normal load was kept constant at 50 N and sliding velocities were set between 1 mm/s and 1 mm/min. Three steels were chosen for investigation: (i) a ferritic-pearlitic steel, (ii) a ferritic steel with chromium carbides and (iii) an austenitic steel. For the determination of wear mechanisms light microscopy and 3D-confocal white light microscopy were used. High resolution scanning electron microscopy, including electron backscatter diffraction (EBSD) measurements, were performed on cross sections, revealing different deformation mechanisms and surface hardening effects. In the EBSD-analyses hardening effects were pointed out, using orientation mapping with inverse pole figures and grain boundary maps in deformed and initial structures. Results indicate a high influence of both temperature and velocity on the scratch behaviour of materials.

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Section: High Temperature Scratch Test (Ht-st)mentioning

confidence: 99%

Section: Microscopical Evaluations and Micro Hardness Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The role of temperature and velocity on deformation and wear mechanisms in fundamental abrasive contacts up to 800°C

Rojacz¹,

Varga²

2015

Materials Characterisation VII

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“…MMC claddings typically consist of crushed or spherical tungsten carbide particles embedded into an iron‐, cobalt‐, or nickel‐based matrix. The microstructure and the wear behavior of these claddings are generally well studied at room temperature, but only a few investigations focus on their particular wear behavior at elevated temperatures . At room temperature, abrasive wear tends to decrease with increasing hardness of the MMC cladding, i.e., with increasing content or size of the hard particles inside the matrix, respectively.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical Wear Testing of Metal Matrix Composite Cladding for Potential Application in Hot Rolling Mills

Domitner

Aigner²,

Stern

et al. 2019

steel research int.

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Laser metal deposition (LMD) is utilized to clad the surface of a miniaturized test roll (Ø 40 mm) of tool steel. The cladding consists of two layers: a nickel alloy as intermediate layer deposited onto the surface of the steel substrate, and a metal matrix composite (MMC) as top layer consisting of spherical tungsten carbide particles embedded into the nickel alloy matrix. The thermomechanical wear behavior of the cladding is investigated on a test rig, where the test roll is pressed against an inductively heated load roll. Multiple test runs up to several hours simulating industrial loading conditions are performed. The presented testing procedure enables predicting the time-dependent abrasive wear behavior of the cladding, in particular for hot rolling mill applications. After testing for 8 h at temperature of 650 C and at contact pressure of approximately 1 GPa, the maximum depth of the wear mark is about 0.12 mm. Partial cracking, debonding and dissolution of the tungsten carbide particles, as well as formation of iron and chromium oxides at the surface of the wear marks occur. However, as low abrasive wear is observed, the investigated MMC may potentially be applicable for cladding rolls in steel hot rolling mills.

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“…For the prevention of critical oxidation of these alloys, a fundamental understanding on oxidation kinetics and mechanisms is essential. Different alloying concepts can provide sufficient oxidation resistance to heat resistant iron alloys up to 800°C, such as Cr, Ni, Si, Ti and Mo [6,7]. Consequently different oxides can be formed on iron based alloys, which were reported in many studies [1-3, 6, 7], but the influence of different alloying elements on the oxidation resistance is still not completely understood.…”

Section: Introductionmentioning

confidence: 99%

High temperature oxidation studies of binary and ternary iron based alloys at 700°C

Rojacz¹,

Birkelbach²,

Varga³

2015

Materials Characterisation VII

Self Cite

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The high temperature oxidation of iron-based alloys is a crucial factor in limiting the lifetime of core components operating under extreme thermal conditions. To understand their oxidation mechanisms on a fundamental level, kinetic studies of oxidation were performed within this study. For this, a newly developed high temperature corrosion test (HT-CT) was utilised to oxidise different materials at temperatures up to 700°C. Several binary and ternary iron-based alloys were selected for investigating the influence of alloying elements: Fe-Cr, Fe-Ni, Fe-Al, Fe-Cr-Ni. Fundamental investigations of the scale formation including detailed scanning electron microscopic surface and cross sectional analyses were performed on the specimens. The chemical compositions of the formed scales were revealed by using X-ray diffraction analyses. Regression analysis with regard to the oxidational time constant and the square law of oxidation was performed. Statistical evaluations were performed to quantitatively evaluate the different influences on the oxidation behaviour of iron based alloys. The focus of this study is the disclosure of different oxidation mechanisms on the tested model alloys. The influence of individual alloying elements and their interdependence on the oxidation behaviour is presented. The results indicate a high relevance of the alloying elements in iron based alloys on the oxidational stability and can be ranked as Ni << Cr < Al. This ranking can be justified according to diffusion coefficients and the standard formation enthalpy of the oxides and their influence on the formation of oxide layers, which can be statistically compared to the oxidational stability of different model alloys presented within this study.

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Influence of Secondary Precipitations in Fe-Based MMCs on High Temperature Wear Behaviour

Cited by 14 publications

References 30 publications

The role of temperature and velocity on deformation and wear mechanisms in fundamental abrasive contacts up to 800°C

The role of temperature and velocity on deformation and wear mechanisms in fundamental abrasive contacts up to 800°C

Thermomechanical Wear Testing of Metal Matrix Composite Cladding for Potential Application in Hot Rolling Mills

High temperature oxidation studies of binary and ternary iron based alloys at 700°C

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