A study has been conducted on the solidification cracking behavior of three heats of Filler Metal 82 (FM 82) which have only small differences in chemical composition but exhibit large differences in cracking susceptibility during production welding. The cast pin tear test (CPTT) was utilized to determine the solidification cracking response and relative susceptibility ranking of each heat. Additional CPTT work was conducted to determine the effect of dilution of a resistant heat by a susceptible heat. The solidification behavior was also evaluated using Thermo-Calc™ software to estimate the solidification temperature range fraction eutectic that forms at the end of solidification. Light optical microscopy (LOM), scanning electron microscopy (SEM), and fractography were performed to determine differences in microstructural features between a susceptible and resistant heat. CPTT results showed excellent correlation and repeatability relative to previous testing that had been conducted, and the susceptibility ranking confirmed the behavior observed during production welding. The dilution study showed that as little as 10% dilution of a resistant heat by a susceptible heat increased the cracking susceptibility significantly demonstrating not only the potency of the “bad” heat but also the sensitivity of the CPTT to small compositional changes. Thermodynamic calculations showed no direct correlation between solidification temperature range and solidification cracking susceptibility, suggesting that differences in cracking response may be attributed to the phenomenon of crack healing by liquid backfilling. Additionally, characterization techniques identified different levels of eutectic backfilling between “good” and bad” heats as well as a variation in precipitate morphology.
Welding in the World – Springer Journals
Published: May 17, 2017
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