The effects of degassing, grain refinement & Sr-addition on melt quality-hot tear sensitivity relationships in cast A380 aluminum alloy
Document Type
Article
Publication Date
8-1-2018
Abstract
Hot tearing tendency of A380 with various element additions (Sr, Sr+Ti, Ti, B and B+Sr) was investigated. Constrained rod casting (CRC) hot tearing test method was used to characterize the hot tearing sensitivity. Reduced pressure test (RPT) samples were produced from each condition and all trials were repeated three times. Number density of pores on the cross section of RPT samples was calculated via digital image processing and statistical analysis was carried out. Microstructure analysis was carried out to observe the effect of alloying elements. Hot torn cross sections were subjected to SEM analysis. It was found that in aluminum alloys, the most deleterious defects, bifilms that are the cause of many defects, play an important role in initiating the hot tearing during solidification. It is important to note that the shape, size and distribution of bifilms are too complex. They act as heterogeneous nucleation site for liquid to separate and thus increase hot tearing.
Publication Title
Engineering Failure Analysis
Volume
90
First Page
90
Last Page
102
Digital Object Identifier (DOI)
10.1016/j.engfailanal.2018.03.025
ISSN
13506307
Citation Information
Uludağ, Çetin, R., Dispinar, D., & Tiryakioğlu, M. (2018). The effects of degassing, grain refinement & Sr-addition on melt quality-hot tear sensitivity relationships in cast A380 aluminum alloy. Engineering Failure Analysis, 90, 90–102. https://doi.org/10.1016/j.engfailanal.2018.03.025