Abstract
The morphological characteristics of prior beta grain and subgrain boundaries in Ti-6 Al-6 V-2 Sn and Ti-6 Al-2 Sn-4 Zr-6 Mo fusion weldments have been studied using a unique decoration technique. Subgrain boundary characteristics were often found to differ from those of the more commonly observed microsegregation-revealed solidification substructure. Differences resulted both from alterations in the true cell boundary morphology and from the creation of secondary subgrain boundaries during weldment cooling. Decorated subgrain structures created during weldment cooling were often observed to be stable in weldments which had undergone super-transus post-weld heat treatment, and consequently which had experienced several allotropic transformations. Although a complete understanding of the decoration technique remains elusive, conclusions obtained concerning the validity of the subgrain decoration technique and weldment substructure characteristics were found to be complementary.
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