L-605 Alloy

Alloy name: L-605
Diagram No.: 931
Type of diagram: TTT
Chemical composition in weight %: 20.18% Cr, 15.11% W, 9.93% Ni, 0.07% C, 0.034% N, 2.01% Fe, 0.01% Si, 1.51% Mn, balance is Co
Alloy group: Cobalt-based alloys
Note: Time-Temperature-Precipitation diagram of L-605 from ORNL data (2007) [19].
Yukawa and Satoinvestigated the formation of intermetallics and carbides at different temperatures and aging time, and summed up the results into a Time-Temperature-Precipitation (TTP) diagram. Additional experiments were conducted by Shingledecker et al., and the resulting TTP diagram is illustrated on Figure.
The occurrence of precipitation at earlier and later stages of aging treatment is responsible of the age-hardening phenomenon in L-605 alloy. The maximum hardening occurs at nearly 900C, and induces a significant loss of ductility. The tensile curve of the Figure 1.30a is a characteristic example of hardening and embrittlement by precipitation. After annealing 6000h at 675.C, carbide phases such as M23C6 or M6C and laves phases are formed. These precipitates contribute to the age-hardening and embrittle the material. To conclude, precipitates are easy to form in L-605 alloy and can lead to age-hardening which is of great interest industrially for the production of hard materials. The downside of precipitation is a dramatical loss of ductility, which can lead to the premature rupture of the material. Therefore the amount and the morphology of precipitates is a key point for obtaining the adapted mechanical properties.
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