Analysis of thermo-mechanical cracking in refractory coatings using variable pulse-duration laser pulse heating
✍ Scribed by J.M. Warrender; C.P. Mulligan; J.H. Underwood
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 666 KB
- Volume
- 263
- Category
- Article
- ISSN
- 0043-1648
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✦ Synopsis
Large caliber cannon firing represents a unique and demanding environment, characterized by a transient surface temperature spike of about 1500 K over about 2 ms. Design and evaluation of protective coatings that can withstand this intense thermal loading without thermo-mechanical failure and wear is an ongoing process, but live-fire tests to assess coating performance are difficult and expensive. Previous studies demonstrated that Cr and Ta coatings irradiated with a pulsed laser with a 5 ms pulse duration exhibited morphological features comparable to those observed in cannons, including recrystallization and grain growth of Cr, crack formation, a phase transition in the substrate steel, interface degradation, and chemical reactions in the steel [P.