A 1-in. (25.4 mm) diameter yttria-dispersion-strengthened MA957 ferritic steel alloy tube with a 0.125" (3.18 mm) wall thickness was successfully plasticized by friction stir welding. The pin tool was a W-Re tool with 0.125" (3.17 mm) diameter tip. It showed no discernable wear for the total 12" (305 mm) of weld. Weld conditions were 1000 and 1400 RPM, 4 in/min (101 mm/min), with and without preheating to 135ºC. Metallographic analysis of the post friction-stir welded material showed a decrease in material hardness to 225±22 HV compared to the parent material at 373±21 HV. All weld conditions produced plasticization; however, improved plasticization was observed for preheated samples
Revised: January 18, 2010 |
Published: April 2, 2005
Citation
Howard S.M., B.K. Jasthi, W.J. Arbegast, G.J. Grant, S.K. Koduri, D.R. Herling, and D.S. Gelles. 2005.Friction Stir Welding Of Ma957 Oxide Dispersion Strengthened Ferritic Steel. In Fusion Materials Semi-Annual Report for the period ending December 31, 2004, DOE/ER-0313/37. 55-60. Oak Ridge, Tennessee:Oak Ridge National Laboratory.PNNL-SA-44740.