Microstructure Evolution of Steering Knuckle Aluminum Casting During Solution and Aging Process
Solution treatment and aging treatment process with different holding time was introduced to the A365 aluminum alloy steering knuckle casting.Observe the tissue changes of the samples with the increase of time.Results show that when the solution temperature is 540 ℃ and the solution time is 4 h,the distribution of eutectic silicon in the matrix is the most uniform,and the shape distribution is mostly granular.At this time,the average size and area fraction of eutectic silicon are at a high level,which makes the material performance improved.When the aging temperature is 175 ℃,the size,shape and distribution of the eutectic silicon can be optimized with the increase of the aging treatment time.Within 1～3 h,with the increase of time,the proportion of eutectic silicon continued to increase and the grain size continued to refine,and the hardness of A356 aluminum alloy continued to increase,reaching the level of complete T6 treatment.
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维普
