Twenty-five percent and 8%


reductions in average linear wear rates were achieved with Alloy V and Alloy N over the unalloyed ADI. Alloy V and N showed 16% and 5% improvements over the standard ADI alloy (Table 4). “The increased wear resistance


of microalloyed ADIs is mostly due to an increase in their load bearing abilities due to the pres- ence of hard alloy carbide pre- cipitates in the tough ausferrite matrices,” Padan reported. According to Padan, the pres- ence of vanadium and niobium as microalloying elements in ADI does not alter its basic mechanism of wear, which is mostly oxidative and delamination type. 


T e paper (12-019) on which this article is based was fi rst presented at the 2012 American Foundry Society Met- alcasting Congress in Columbus, Ohio.


Fig. 6. These optical photomicrographs show the microstructure for base Alloy B, Alloy V, Alloy N and standard Alloy M (clockwise from top left).


Nov/Dec 2012 | METAL CASTING DESIGN & PURCHASING | 45


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60