Effects of nodularity on thermal conductivity of cast iron

Holmgren, Daniel; Diószegi, Attila; Svensson, Ingvar L

doi:10.1179/136404607x202690

Cited by 33 publications

(40 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thermal conductivity is affected both by the metal matrix and the graphite content . As known, cementite or carbide has poorer thermal properties compared to pearlite, whereas thermal property of pearlite is smaller than that of ferrite .…”

Section: Resultsmentioning

confidence: 99%

Tomographical Study of the Effect of Graphite on Properties of Cast Iron

Liu

Xing

et al. 2018

steel research int.

View full text Add to dashboard Cite

Two specimens of cast iron, namely A1 and A2, the size, shape, and interconnectivity of graphite are analyzed using X-ray tomography. The results reveal that the morphology of vermicular graphite is a coral-tree-like. The interconnectivity of A2 specimen is better than A1 specimen. The results also demonstrate that the thermal conductivity of A2 specimen is larger than A1 specimen, whereas the tensile strength of A2 specimen is smaller than A1 specimen. With an increase in temperature, the thermal conductivity of both A1 and A2 specimen increases initially, and then decreases, whereas the tensile strength decreases slightly at first, and then decreases rapidly. Finally, the fracture surfaces of both A1 and A2 specimen are studied.

show abstract

Section: Resultsmentioning

confidence: 99%

Tomographical Study of the Effect of Graphite on Properties of Cast Iron

Liu

Xing

et al. 2018

steel research int.

View full text Add to dashboard Cite

show abstract

“…Holmgren [18] conducted experimentally evaluated the variation of the thermal conductivity by temperature due to nodularity differences. In his study covering a temperature range of 25-500°C, the thermal conductivity of flake graphite cast iron declined considerably as the temperature was increased, while that of C. V. graphite cast iron and spheroidal graphite cast iron, respectively, remained almost constant or even increased in some intervals.…”

Section: Mechanical and Thermal Propertiesmentioning

confidence: 99%

Development of compacted vermicular graphite cast iron for railway brake discs

Lim

Goo

2011

Met. Mater. Int.

View full text Add to dashboard Cite

In the case of employing brake discs as a key component of mechanical brake equipment, the initiation of thermal cracking owing to repetitive thermal shock generated during braking may potentially lead to higher maintenance costs, worsened braking performance, and greater risk of railway accidents. The purpose of this study is to gain basic data to facilitate application of compacted vermicular (C. V.) graphite cast iron to brake discs in order to obtain high thermal crack resistance and improved lifetime. To this end, this study developed three types of C. V. graphite cast iron with differing content of key elements, including Ni, Cr, and Mo. Each test specimen underwent numerous tests for evaluation of materials characteristics, and the results were compared with those obtained for existing materials. The test results show that the thermal fatigue lifetime of material C is nearly double that of the conventional material. This demonstrates the suitability of material C as a material for brake discs in mid-to high-speed railway vehicles.

show abstract

“…[10,25] Thermal conductivity is mainly affected by the movement of free electrons; hence, impurities, lattice mismatches, or dissolved elements will scatter the electrons and reduce the thermal conductivity value. Martensite and ausferrite both have less favorable crystal structures compared to pearlite, explaining the much lower thermal conductivity for sample 4A, as can be seen in Figure 16.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Tensile and Thermal Properties in Compacted Graphite Irons at Elevated Temperatures

Selin

2010

Metall Mater Trans A

View full text Add to dashboard Cite

Tensile and thermal properties of compacted graphite irons (CGIs), prepared with various molybdenum additions and solidification rates, have been investigated for temperatures between room temperature and 873 K (600°C). A slower solidification rate resulted in larger and fewer graphite particles as well as in an increase of intercellular cementite, or carbides. Molybdenum is a carbide stabilizing element; i.e., increasing additions of molybdenum increased the amount of carbides. Young's modulus decreased with increasing temperature, and a lower solidification rate increased this parameter slightly. Both increasing content of carbide and increasing nodularity increased the Young's modulus. Strength parameters such as yield strength and ultimate tensile strength (R m ) were affected in similar ways by temperature and solidification rate. The strength values were generally quite temperature independent for temperatures below 573 K (300°C) but decreased rapidly for higher temperatures. Increasing nodularity increased the strength, while increasing content of carbide had little influence on the values. The thermal conductivity decreased with increasing content of carbide and increasing nodularity. The thermal conductivity generally showed a maximum value at 573 K (300°C). A contradictory linear relationship was found between yield strength and thermal conductivity.

show abstract

Effects of nodularity on thermal conductivity of cast iron

Cited by 33 publications

References 5 publications

Tomographical Study of the Effect of Graphite on Properties of Cast Iron

Tomographical Study of the Effect of Graphite on Properties of Cast Iron

Development of compacted vermicular graphite cast iron for railway brake discs

Tensile and Thermal Properties in Compacted Graphite Irons at Elevated Temperatures

Contact Info

Product

Resources

About