Abstract
This research work concerns an assessment of the effect of one step inoculation method on thin section castings (2-5) mm analyzed. In this study inoculants representing Ce, Zr and Sr bearing Fe-Si alloys were used. It has been observed that section thickness of 2 mm thin plate containing Ce bearing Fe-Si alloys at 0.4wt% contain mainly pearlitic matrix having microhardness (HV20), ultimate tensile strength (UTS) and percentage of elongation are 272 HV, 720 MPa and 4.5% respectively. It was observed that wear of 2 mm section thickness of thin plate containing Ce bearing Fe-Si alloys have greater wear resistance (272HV) compare to Zr bearing Fe-Si alloys (262HV) and Sr bearing Fe-Si alloys (259HV) respectively at 0.4wt% due to reason of pearlitic and ferritic volume fraction contents present in matrix.
Highlights
Unlike gray iron whose production tends to stagnate, ductile iron enjoy growth exceeding 3% per year (Karsay, 1965)
It has been observed that wt % of one step in mould inoculation incresases 0.2% to 0.4% pearlitic matrix has been formed while wt% was 0.6%, the matrix has been changed to pearlitic to ferritic
It has been observed that Ce bearing Fe-Si alloy for one step in mould inoculation at 0.4wt% contain mainly pearlitic matrix having ultimate tensile strength(UTS) and percentage of elongation are 720 ±3 MPa and 4.5 ±3% which are higher than Zr bearing Fe-Si alloy ( UTS and % elongation are 655 ±5 MPa and 3.3 ±5%) and Sr bearing Fe-Si alloy (UTS and % elongation are 557 ±5 MPa and 2.3 ±5% ) respectively shown in Table 4. (Riposan, Chisamera, Uta, Stan, Naro, & Williams, 2014; Ochulor, Adeosun, Amuda, & Balogun, 2015) reported that carbon diffusion towards graphitization centre may due to formation of cerium-calcium-sulphides and oxides so volume fraction of ferrite increases more and volume fraction of pearlite decreases less in Ce bearing Fe-Si alloy
Summary
Unlike gray iron whose production tends to stagnate, ductile iron enjoy growth exceeding 3% per year (Karsay, 1965). In the recent years basically interest on minimizing the weight of casting components and increasing the mechanical properties. This motivates automobile manufacturers to decrease the weight of automobile leads in the 1970’s by reducing the thickness of steel sheets (Mampaey, & Xu, 1997; Yeunga, & Leea, 1998; Ruxanda, Stefanescu, & Piwonka, 2002; David, Mossone, Boeri, & Sikora, 2009). Ochulor, Adeosun, Amuda, and Balogun (2015) found that two step inoculation methods provide better nodule count and nodularity with 2, 3 and 4 mm thin plate thickness respectively. It can be seen that Ce bearing Fe-Si alloy at 0.4 wt % provides better mechanical properties, nodule count, nodularity (> 90%) and nodule size distribution as compare to Zr bearing Fe-Si alloys and Sr bearing Fe-Si alloys
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