re: What would you expect from your employer in this situation?

You're not going to get anything. You are simply doing your job. You were able to save the company money because of your skill set, that's what you are paid to do.

However, be sure to document how much money you saved when it comes to raise/eval time. Your company will want to ensure you don't leave. If you are not happy with your raise, polish up that resume and find another job.