ADDING IT ALL UP 2 Procedure
Te study tested variants of the 6061 wrought alloy (without copper) and variants of the 6082 wrought alloy.
“Te main objective was to study
the [iron] phase formation and dis- solution at two [iron] levels, over a range of freezing rates, and as a function of time and temperature for the [heat treat] parameters,” the researchers wrote. Each alloy configuration was cast into duplicate end-chilled blanks. Te first blank was dissected and heat treated at various times and tempera- tures for metallographic study. Te second was sliced and heat treated before being tested for differences in mechanical properties. Te experiment also involved a
chemistry and hot tearing study in which the researchers added titanium and other elements to the two base
Study: Solidification and Heat Treatment of 6061 and 6082 Alloys for Use in Shape Casting
Researchers: B. Bourassa, D. Jean, A. Lemieux , J. Langlais and F. Major, Rio Tinto Alcan, Jonquiere, Quebec, Canada Background—Casting wrought alloys long has been a goal of the metalcasting industry, but a single solution has not been found to make the process production ready.
1 2 3
Procedure—Each alloy was cast and studied for metallography and mechanical properties. A hot tearing study was conducted, and semi-solid casting was tested against diecasting.
Results and Conclusions—Wrought alloys can be cast into intricate shapes if the chemistry, casting process and heat treatment are optimized.
alloys to determine the best addition for the reduction of hot tear defects in the final castings. Two casting processes, semi-solid casting and fully liquid diecasting, were examined to determine which was the most effec- tive in producing defect-free castings.
ONLINE RESOURCE
To read the full paper on which this article was based, visit
www.moderncasting.com.
Fig. 1. Shown is a comparison of alloys 6061 and 6082 after six hours at 986F (530C), the typical solutionizing temperature for the alloys.
46 | MODERN CASTING February 2012
Fig. 2. Shown is a comparison of alloys 6061 and 6082 after six hours at 1,058F (570C), the typical homogenizing temperature for the alloys.
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68