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- W157077274 abstract "Gas tungsten arc (GTA) spot welds were made on 1 × 0.5 × 0.018-in. (2.54 × 1.57 × 0.0457-cm) samples of Ti-14.2Al-21.3 Nb (wt-%). The samples were welded for 3 s at 32 A and 17 V. The as-welded fusion zone consisted of a ω-type, «tweed-like» microstructure with a microhardness that was higher than the base metal by as much as 100 VHN. Two postweld heat treatment (PWHT) temperatures were chosen, which represented the upper (980°C) and lower (650°C) limits of the α 2 +β region of the Ti 3 Al-Nb pseudo-binary phase diagram. Short PWHT times at 650°C resulted in secondary hardening above that of the as-welded condition while longer times resulted in hardness values near that of the base metal. Only heavily faulted α 2 was detected in the 650°C PWHTs. The PWHT at 980°C produced rapid softening of the weld metal. A 1-min PWHT at 980°C had a microhardness and microstructure similar to the 650°C, 50 h PWHT. All other PWHTs at 980°C had microhardness values near that of the base metal. There were two distinct microstructures for the 980°C PWHT. One consisted of α 2 subgrains with a high dislocation density and B2 precipitates. The other consisted of clear α 2 grains with B2 at grain boundaries" @default.
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- W157077274 date "1995-01-01" @default.
- W157077274 modified "2023-09-27" @default.
- W157077274 title "Effect of postweld heat treatment on Ti-14%Al-21%Nb fusion zone structure and hardness" @default.
- W157077274 hasPublicationYear "1995" @default.
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