Thermal-Conductivity Measurements and Predictions for Ni–Cr Solid Solution Alloys

Endo, Rie; Shima, Masaya; Susa, Masahiro

doi:10.1007/s10765-010-0813-x

Cited by 34 publications

(14 citation statements)

References 12 publications

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“…The tool shank was made of tungsten carbide (WC) and both shoulder and shank were surrounded by a collar made of Ni-Cr as shown in Fig.1b. The thermal properties for the PCBN hybrid tool are given in Table 2 [10,11].…”

Section: Experimental Methods 21 Materialsmentioning

confidence: 99%

Modelling of friction stir welding of DH36 steel

Al-moussawi

Smith

Young

et al. 2017

Int J Adv Manuf Technol

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A 3-D computational fluid dynamics (CFD) model was developed to simulate the friction stir welding of 6-mm plates of DH36 steel in an Eulerian steady-state framework. The viscosity of steel plate was represented as a nonNewtonian fluid using a flow stress function. The PCBN-WRe hybrid tool was modelled in a fully sticking condition with the cooling system effectively represented as a negative heat flux. The model predicted the temperature distribution in the stirred zone (SZ) for six welding speeds including low, intermediate and high welding speeds. The results showed higher asymmetry in temperature for high welding speeds. Thermocouple data for the high welding speed sample showed good agreement with the CFD model result. The CFD model results were also validated and compared against previous work carried out on the same steel grade. The CFD model also predicted defects such as wormholes and voids which occurred mainly on the advancing side and are originated due to the local pressure distribution between the advancing and retreating sides. These defects were found to be mainly coming from the lack in material flow which resulted from a stagnant zone formation especially at high traverse speeds. Shear stress on the tool surface was found to increase with increasing tool traverse speed. To produce a "sound" weld, the model showed that the welding speed should remain between 100 and 350 mm/min. Moreover, to prevent local melting, the maximum tool's rotational speed should not exceed 550 RPM.

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Section: Experimental Methods 21 Materialsmentioning

confidence: 99%

Modelling of friction stir welding of DH36 steel

Al-moussawi

Smith

Young

et al. 2017

Int J Adv Manuf Technol

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“…Hall coefficient measurements show the concentration of charge carriers to be 8 × 10 22 and 29 × 10 22 at room temperature and 800 K, respectively. The room temperature in-plane thermal conductivity measurement is measured to be 12.0 W m −1 K −1 , which is relatively low for metals and comparable to elemental mercury (8.4 W m −1 K −1 ) or nichrome alloys (between 10 and 20 W m −1 K −1 depending on alloy composition) [ 33 , 34 ]. However, this value is three to four times larger than semiconducting CrN thin films [ 13 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of single-phase epitaxial Cr2N thin films by reactive magnetron sputtering

et al. 2018

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Cr 2 N is commonly found as a minority phase or inclusion in stainless steel, CrN-based hard coatings, etc. However, studies on phase-pure material for characterization of fundamental properties are limited. Here, Cr 2 N thin films were deposited by reactive magnetron sputtering onto (0001) sapphire substrates. X-ray diffraction and pole figure texture analysis show Cr 2 N (0001) epitaxial growth. Scanning electron microscopy imaging shows a smooth surface, while transmission electron microscopy and X-ray reflectivity show a uniform and dense film with a density of 6.6 g cm −3 , which is comparable to theoretical bulk values. Annealing the films in air at 400 °C for 96 h shows little signs of oxidation. Nano-indentation shows an elastic–plastic behavior with H = 18.9 GPa and E r = 265 GPa. The moderate thermal conductivity is 12 W m −1 K −1 , and the electrical resistivity is 70 μΩ cm. This combination of properties means that Cr 2 N may be of interest in applications such as protective coatings, diffusion barriers, capping layers and contact materials.

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“…34 Based on the W-F law, Smith and Palmer (S-P) suggested the following equation 35 l~AL 0 TszB where parameter A represents the Lorenz number differences among different alloys, and B stands for the constant lattice thermal conductivity, and the S-P equation describes the thermal-electrical behaviour well in most cases. [35][36][37][38] More recently, the authors have proven that the thermal conductivity of the binary Mg alloys could be correlated with the electrical conductivity quite well on the basis of S-P equation at the temperature range from 298 to 448 K, which demonstrates that the thermal conductivity parallels with the electrical conductivity. 26 The consistence between thermal and electrical conductivities in the present Mg-Al-Zn alloys confirms the accuracy of the above conclusion.…”

Section: Discussionmentioning

confidence: 99%

Thermal and electrical conductivity of Mg–Zn–Al alloys

Pan

Yang

Peng

et al. 2014

Materials Science and Technology

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In the present work, thermal and electrical conductivity measurement was conducted on the cast Mg-Zn-Al alloys (ZA alloys) in the wide composition range (1-6 wt-%Zn, 1-10 wt-%Al). For alloys with the same content of Zn, the thermal/electrical conductivity of ZA alloys decreased exponentially with Al composition without exception. For alloys with same Al content, variation of thermal/electrical conductivity showed a similar trend for most of the alloys except the case for 6 wt-%Al, which followed ZA26.ZA36.ZA16.ZA56.ZA66. The microstructures of the selected alloy systems were investigated in detail, and the mechanism of thermal/electrical conductivity variation was thus proposed. The phase transformation with composition and the different effects of Zn and Al on the thermal/electrical conductivity of Mg alloys were believed as two controlling factors.

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Thermal-Conductivity Measurements and Predictions for Ni–Cr Solid Solution Alloys

Cited by 34 publications

References 12 publications

Modelling of friction stir welding of DH36 steel

Modelling of friction stir welding of DH36 steel

Synthesis and characterization of single-phase epitaxial Cr2N thin films by reactive magnetron sputtering

Thermal and electrical conductivity of Mg–Zn–Al alloys

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