An analytical electron microscope investigation of the phase transformations in a simulated heat-affected zone in alloy 800

Autor:	M. J. Cieslak, J. C. Lippold, A. D. Romig
Rok vydání:	1988
Předmět:	Auger electron spectroscopy Materials science Alloy Metallurgy Metals and Alloys Intermetallic Fractography Electron microprobe engineering.material Condensed Matter Physics Atomic diffusion Mechanics of Materials engineering Grain boundary Liquation
Zdroj:	Metallurgical Transactions A. 19:35-50
ISSN:	2379-0180 0360-2133
DOI:	10.1007/bf02669813
Popis:	The heat-affected zone (HAZ) hot-cracking behavior of Alloy 800 was investigated with hot ductility (Gleeble) testing during a simulated HAZ thermal cycle. Microstructural analyses were performed by optical metallography, fractography, electron microprobe analysis, and analytical electron microscopy on specimens that were water quenched from selected temperatures during this thermal cycle. Analysis of analytical electron microscopy (AEM) and Auger electron spectroscopy (AES) data suggests that incipient melting of the grain boundaries occurs at temperatures of 1300 °C and above. The HAZ hot-cracking mechanism was consistent with aspects of a constitutional liquation phenomenon involving a nonequilibrium eutectic-type reaction between grain boundary Ti(C, N) and the austenitic matrix. The extent of expected HAZ cracking would be low as the liquation of Ti(C, N) was localized and no lower melting intermetallic solidification products(e.g., Laves) were observed. The mechanistic observations were consistent with classical thermodynamic and solid state diffusion models.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9e5c2c0fef6fe6e19e9ff48f795a2750 https://doi.org/10.1007/bf02669813 Zobrazit plný text záznamu