I do not remember very well the surface of as-forged aluminum billet but these are my observations about these billets. I hope it help.
As-cast aluminum billet, it can be continuous casting or batch mold casting. The surface of the continuous casting has parallel lines like wrinkles and of...
FYI. The fracture and metallographic analysis found that the fracture happened due to foundry defect (cold lap 60% of the cross section) and the dent was caused after the fracture.
Your comments and answer helped to find the root cause.
Thanks
Our customer returned a casting fractured in the field.
Very close to the fracture, there is a dent.
Is there any way to determine the impact load base on the dent dimensions (area and depth)?.
The part is made in A356 T6 aluminum alloy.
Any comments or leads we will appreciate.
What process do you use? sand or permanent mold?
What type of porosity you have in the leaks? microshrink, gas porosity, Al oxides, inclusions?
Here you have some facts about refiner and modifier (AFS has several technical informations about these facts).
Ti-B is an excellent grain refiner...
I hope this is not too late and somebody can read it.
On 05-11-02, ETCH posted about short cycles in aluminum heat treat.
After some replies, TVP realized that it is possible to have very short heat treat cycles in aluminum alloys and he (TVP) posted titles of three excellents technical report...
tvp,
I do not remember very well, (it was 2000) how I got this but the paper has this information and I am sure it will help.
Header:
Materials Science Forum Vols. 331-337 (2000) pp. 277-282
Footer:
Published in ‘Aluminum Alloys- Their Physical and Mechanical properties’ Year:2000, pp...
tvp,
Thanks for your reply.
We have installed several controls in the heat treat process but we still have problems and no answers.
About the Mg2Si, are these micros (ASM HANDBOOK Volume 9Metallography and Microstructures)
in as cast condition or after heat treat?
In the AFS book...
So do I, but with the same result nothing.
I have some microphotographs for A356 before and after heat treat if you want I can send you.
I hope this will be a little help for you.
There is a technical report about "Influence of Mg content on the microstructure and solid solution chemistry of Al7SiMg casting alloy during solution heat treatment" by J.A. Taylor, D.H. St John. In this report they state:
The microstructure of 356 and 357 alloys in the as cast state...
TVP,
Thank you for your answers.
The plant cast and heat treat suspension components, they have between 0.5 to 1.5 inches wall thickness.
The tensile test bars are cut from rib castings of 1 inch thickness (high stress location)
The typical microstructure is round silicon in the eutectic...
Dear colleagues:
We make aluminum parts by low pressure permanent mold, LPPM. Some times after heat treat the A356 castings, have low hardness, low yield and/or low tensile strength.
We sent samples to two Universities in order to determine in which step of the heat treat (solution, quench, or...
