I bought apple phone in Australia can I replace in India

This is probably not a big problem, and you might not need to replace your iPhone. Please see the note about charging to 80% and temperature in If your iPhone, iPad, or iPod touch won't charge - Apple Support

If you are wanting to warranty it, you need to take it to the country you purchased it for that. If you are using the giveback program and purchasing the new device that should be fine.