* Duplex steel is a composite: It's a combination of austenitic and ferritic phases. Each phase has its own distinct properties, including sound velocity.
* Composition variation: Duplex steels are formulated with varying proportions of austenite and ferrite, which can impact the sound velocity.
* Microstructure: Factors like grain size, phase distribution, and heat treatment can influence sound velocity.
What you can do instead:
1. Consult material data sheets: Look for the specific duplex steel grade you are interested in. Reliable data sheets may provide information on sound velocity.
2. Use ultrasonic testing: This method directly measures the speed of sound in the material, providing a more accurate value for your specific sample.
3. Estimate based on known values: If you have information about the phase composition of your duplex steel, you can use average values for sound velocity in austenitic and ferritic stainless steels to get a rough estimate.
Remember: The sound velocity in duplex steel is not a fixed constant, and any value you obtain will be an approximation for the specific conditions you are working with.
