Abstract
A delay in grain boundary liquation was observed in the subsolidus portion of the weld heat affected zone (HAZ) of alloy 718 for the solution-treated material. However, for the homogenized or the homogenized and aged alloy, an instantaneous liquation of the grain boundaries occurred in the subsolidus HAZ. The above difference in the grain boundary liquation kinetics may account for the greater hot-cracking susceptibility of the homogenized or the homogenized and aged alloy compared to that of the solution-treated alloy. Existing models of grain boundary liquation are used to explain the observed kinetic effects associated with liquation in the subsolidus HAZ of alloy 718.
| Original language | English |
|---|---|
| Pages (from-to) | 1409-1422 |
| Number of pages | 14 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 24 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 1993 |
| Externally published | Yes |