Study of Dry Wear Behavior and Resistance in Samples of a Horizontally Solidified and T6/Heat-Treated Automotive AlSiMg Alloy
To investigate dry wear behavior in an aluminum-based automotive alloy, transient horizontal solidification experiments using a water-cooled directional solidification device have been performed with the Al7Si0.3Mg alloy (wt%). Samples of the as-cast ingot at positions (P) 2, 4, 6, 40, and 80 mm fro...
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| Published in: | Tribology letters Vol. 68; no. 2 |
|---|---|
| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
New York
Springer US
01-06-2020
Springer Nature B.V |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | To investigate dry wear behavior in an aluminum-based automotive alloy, transient horizontal solidification experiments using a water-cooled directional solidification device have been performed with the Al7Si0.3Mg alloy (wt%). Samples of the as-cast ingot at positions (P) 2, 4, 6, 40, and 80 mm from the cooled interface were subjected to precipitation hardening heat treatment (T6-type). The heat treatment has been applied under the following conditions: solution treatment for 3 h at 520 ± 2 °C, followed by quenching in warm water (70 ± 2 °C), aging for 3 h at 155 ± 2 °C and air-cooling. Dry wear tests were performed on both the as-cast and heat-treated samples. The wear tests were carried out by rotary-fixed ball wear machine means. The analyzed parameters were solidification growth and cooling rates (
V
L
and
T
R
), secondary dendritic spacings (
λ
2
), and wear volume and rate (
W
V
and
W
R
). An interrelation between these parameters has been conducted and experimental mathematical equations have been proposed to characterize the
W
V
and
W
R
dependence on
P
,
V
L
,
T
R
and
λ
2
. The T6-heat treatment has affected the length of the as-cast dendritic scale, increasing the
λ
2
values as well as the wear features of the investigated automotive alloy. Finer and coarser dendritic microstructures inherited better wear resistance for the as-cast and heat-treated samples, respectively. An evaluation by occupied area fraction (%IRAF) of interdendritic regions on wear resistance in the as-cast and heat-treated samples has been performed. It has been observed higher and lower IRAF values in the as-cast and heat-treated samples, respectively. |
|---|---|
| ISSN: | 1023-8883 1573-2711 |
| DOI: | 10.1007/s11249-020-01302-z |