Microstructure and mechanical properties of molybdenum-titanium-zirconium-carbon alloy TZM processed via laser powder-bed fusion

Autor:	J. Stajkovic, P. Singer, Gerhard Leichtfried, Ilse Letofsky-Papst, K.-H. Leitz, Heinrich Kestler, J. Braun, L. Kaserer
Rok vydání:	2020
Předmět:	Zirconium Materials science Metallurgy Alloy chemistry.chemical_element engineering.material Microstructure Solid solution strengthening Grain growth chemistry Molybdenum engineering Grain boundary Texture (crystalline)
Zdroj:	International Journal of Refractory Metals and Hard Materials. 93:105369
ISSN:	0263-4368
DOI:	10.1016/j.ijrmhm.2020.105369
Popis:	Molybdenum, processed by laser powder-bed fusion (LPBF), is susceptible to hot cracking because segregated oxygen impurities significantly weaken grain boundaries through the formation of MoO2. The present study reports on the LPBF processing of the most important molybdenum alloy TZM, whose alloying elements—titanium, zirconium, and carbon—lead to particle and solid solution strengthening. Results of investigations into the resulting microstructure and mechanical properties when processing TZM by LPBF are presented. The alloying elements suppress the segregation of oxygen to the grain boundaries so that crack-free samples with a density of 99.7 ± 0.3% may be produced. The microstructure shows grains that are columnar due to epitaxial grain growth and a weak 〈111〉 fiber texture parallel to the building direction. Mo2C and ZrO2 particles with a size of
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ee7fff0c6ca48cabdb82427502e08f3a https://doi.org/10.1016/j.ijrmhm.2020.105369 Zobrazit plný text záznamu Full Text from ScienceDirect