Gravity Sand Cast - Investment Casting LM25TF
Gravity Sand Cast - Investment Casting LM25TF
(OP)
Hello All,
Can anyone give me the benefit of their experience with casting LM25TF?
Is there any difference between the material properties that is caused by the different cooling rates between gravity sand casting and investment casting? There is subsequent heat treatment after each process, does this TF process bring them back to the same level.
I have a customer that is concerned about how the lack of controlled cooling on investment casting affects the grain structure.
Can anyone help?
Thanks in advance
Adrian
Can anyone give me the benefit of their experience with casting LM25TF?
Is there any difference between the material properties that is caused by the different cooling rates between gravity sand casting and investment casting? There is subsequent heat treatment after each process, does this TF process bring them back to the same level.
I have a customer that is concerned about how the lack of controlled cooling on investment casting affects the grain structure.
Can anyone help?
Thanks in advance
Adrian





RE: Gravity Sand Cast - Investment Casting LM25TF
RE: Gravity Sand Cast - Investment Casting LM25TF
Fatigue life of aluminum castings is controlled first by defects (porosity, oxide films) and in the absence of those, then by microstructural details (secondary dendrite arm spacing or SDAS, eutectic modification, etc.). Qigui Wang from GM Powertrain has probably done the most work to isolate some of the effects of solidification time on SDAS and subsequent fatigue properties. His work has been published in SAE Technical Papers as well as journal articles, and following link has a summary of some research conducted together with Diran Apelian at WPI. Figure 3 shows the difference between A356-T6 that has SDAS of 20-25 µm vs. 70-75 µm.
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RE: Gravity Sand Cast - Investment Casting LM25TF
RE: Gravity Sand Cast - Investment Casting LM25TF
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RE: Gravity Sand Cast - Investment Casting LM25TF
Regards
Adrian