It’s not possible to hide it on the built-in content types. But you can disable fields on custom post types by de-selecting the post content checkboxes in the fields tab.
If perhaps in another version, be possible?
The one with the plugin “Simple Fields / Magic Fields” that is possible.
Might be possible… WordPress’ implementation of its rich-text editor is problematic however, so it’s not easily manipulated. I generally do not recommend mixing and matching plugins like this: sometimes plugins cause as many problems as they solve. I would recommend you create a separate post-type for your needs and utilize that if needed — it’s always inefficient to “ignore” the built-in fields, and in the case of the post-title, it’s also problematic (WP is hard-coded to look for that value in certain random spots).