HCCIS

AcronymDefinition
HCCISHealth Care Cost Information System (Minnesota)
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The results illustrated that the equilibrium microstructure of the HCCI consisted of ferrite, [M.sub.7][C.sub.3] carbide, and [M.sub.23][C.sub.6] carbide (Figure 3).
Figure 4 shows the microstructures of the specimens of HCCI as-cast and after different heat treatments.
The variation of matrix microstructure may be a main factor affecting the mechanical properties of the HCCI after heat treatments.
Table 2 shows the Rockwell hardness and impact toughness of HCCI after heat treatments.
These results show that the wear resistance of the HCCI was improved by once tempering and twice tempering.
Based on the above mentioned results, hardness is not an important factor that affects the impact wear resistance of the HCCI. However, the impact wear resistance of the HCCI strongly depended on impact toughness; therefore, increasing impact toughness and hardness would effectively improve the impact wear resistance of the HCCI [16].
(1) The as-cast microstructure of the HCCI consists of [M.sub.7][C.sub.3] carbide, [M.sub.23][C.sub.6] carbide, and matrix of mixed martensite and retained austenite.
The wear weight loss strongly depended on impact toughness; therefore, increasing impact toughness and hardness could improve the wear resistance of the HCCI.
Caption: Figure 2: X-ray diffractometer patterns of the HCCI as-cast and after different heat treatments.
Caption: Figure 3: Equilibrium phase of the HCCI calculated by Thermo-Calc software based on TCFE7 database.