intensive care rooms, it was possible to lower the infection rate from 19 infections per 1,000 patient days in control rooms to four infections per 1,000 patient days in copper rooms.


Presentation


Effect of Ni on Fluidity of Cr-Mo Steels (12-030)


Authors


Abhilash Dash, Simon Lekakh, Von Rich- ards and David Van Aken, Missouri Univ. of Science and Technology, Rolla, Mo.


Background Research on the effect of nickel


(Ni) on the fluidity of chromium- molybdenum (Cr-Mo) steels was


conducted using several experimental techniques and modeling (Fig. 2). Computer assisted, single thermocou- ple thermal analysis was used to show the effects of the element.


Conclusions


• The estimated critical volume of solid fraction (0.2) was less than that predicted by thermal analysis and the measured dendrite coherency, which was near 0.3 for all studied steels. This indicates initial solidified phases could block the melt flow in thin channels before development of equilibrium dendrite coherency.


• Measured fluidity showed an increase with superheating above the liquidus point for all steels and had a higher value in steel alloyed by 5% nickel in comparison to unalloyed, 3% nickel and 9% nickel steel.


• The simulation model was able to correctly predict the effect of superheating on fill length and time for 5% nickel steel.


Presentation


Comparison of Monotonic and Cyclic Properties of Ductile Irons in the AFS/DOE Strain-Life Fatigue Database for Cast Iron (12-082)


Author


John Tartaglia, Element Materials Tech- nology, Wixom, Mich.


Background A strain-life fatigue database for


cast irons was developed using Amer- ican Foundry Society (AFS) and U.S. Department of Energy (DOE) fund- ing. Te database contains monotonic


Fig. 2. This fluidity spiral was used to test the effect of nickel on chromium-molybdenum steels.


54 | MODERN CASTING May 2012


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  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76