ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The influences of the different Si (0.723%~4.5%) and Cr (2.0%~8.0%) contents on themicrostructures and properties of Cr-Si-Mn white cast iron were investigated. It is shown that withincreasing of amounts of Si and Cr elements, carbide undergoes an evident change in themorphology from the continuous net to isolated stripe and becomes clearly finer, even formschrysanthemum-like microstructure which is usually found in high Cr white cast iron. Additionally,the amounts of the carbides increase too. The XRD analysis shows that the carbides are a mixture ofFe3C and Fe7C3 phases. Furthermore, the hardness of carbide and matrix is also found toprogressively increase with increasing of amounts of Si and Cr elements. The hardness of the matrixin as-cast white cast iron is over HV400, suggesting that the matrix consists of martensite andbainite phases. The impact toughness of the samples declines evidently when Si content excesses3.0wt%. It is also revealed that the bainite matrix in the Si-Cr white cast iron has a higher impactabrasive wear resistance than others, which is almost not dependent upon heating temperature andcooling rate. When Cr content approaches 5wt%, the impact wear resistance of the new cast iron iscomparable to that of the traditional high Cr cast iron
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.51.31.pdf
