Speaker
Description
There is a need to develop materials that have abrasive wear resistance in high-temperature environments. In previous research, the abrasive wear characteristics in a room temperature environment using a rubber wheel wear tester have been clarified. When considering adaptation to actual equipment, it is important to evaluate in an environment similar to the actual wear environment. Based on this, in the present study, the abrasive wear characteristics of several multi-component white cast irons (MWCIs) at high temperatures were investigated, and the effect of carbides and the abrasive wear mechanism were clarified through detailed observation of the wear conditions.
V-added multi-alloy white cast iron with different Ni contents, Nb-added multi-alloy white cast iron with different C contents, and high-Cr-added multi-alloy white cast iron with different Cr contents were used as specimens. For the high-temperature abrasive wear test, a device that generates abrasive wear by bringing a rotating grinding wheel into contact with the specimens was used. The specific wear rate (mm3/N・m) was used to evaluate the abrasion resistance.
Summary
As a result, in V-added MWCIs, 5V-10Ni exhibited excellent corrosion resistance and high-temperature abrasive wear resistance compared to 5V-0Ni. In Nb-added MWCIs, the carbide area ratio increased with increasing C content, and the high-temperature abrasive wear resistance increased. A large number of NbC were observed on the worn surface. Regarding the high-Cr MWCIs, the 27Cr-added MWCI showed superior abrasion resistance to high-temperature abrasion than the 18Cr-added MWCI, because the M2C carbides precipitated more, although the coarse M7C3 carbides cracked and dropped off. on the whole, micro-plowing was the main wear mechanism for all the specimens.
| Speaker Country | Japan |
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