Report on the Production by Mechanical Alloying of New Heats of 14YWT
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
This report provides a summary of the new heats of 14YWT produced by mechanical alloying. Compared to the past heats of 14YWT, which were based on the nominal composition of Fe-14Cr-3W-0.4Ti-0.3Nb + 0.3Y2O3 (wt. %), the three new heats of 14YWT contain a lower W level (1% vs. 3%) and various Ti levels of 0.2%, 0.3% and 0.4%. Powders with compositions of Fe-14Cr-1W-0.2Ti, Fe-14Cr-1W-0.3Ti and Fe- 14Cr-1W-0.4Ti were produced by ATI Powder Metals via Ar gas atomization. The mechanical alloying procedure consisted of ball milling the powder, canning and degassing the milled powder followed by consolidation of the powder by hot extrusion. Powder consisting of 1 kg mass containing 0.3% Y2O3 powder was ball milled using the high kinetic energy ball mill for 40 h in Ar gas atmosphere. A total of 2 kg of powder from each of the three compositions of 14YWT was produced. The 3 batches of milled powder were added to 4 inch diameter cans that were fabricated from low carbon steel and sealed by electron beam welding. Each of the cans were degassed for 24 h at 300ºC under vacuum. For consolidation of the milled powder, the cans were solutionized at 850ºC for 2 h and then at 1000ºC for 2 h followed by extrusion through a rectangular shaped die to form the 14YWT billets. The 14YWT heat containing 0.4%Ti (14YW4T) was successfully extruded before a critical component on the extrusion press failed, thus preventing any further extrusions until it is repaired.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1560432
- Report Number(s):
- ORNL/LTR--2019/1282
- Country of Publication:
- United States
- Language:
- English
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