Hi @shubhamshethiya and thank you for reaching out to SimScale!
Have you had a look at the Thermal Analysis of a Laser Beam Welding project by @ahmedhussain18? You can use his approach and estimate the martensite percentage you are looking for by post-processing the thermal distribution across the component using the transient thermal analysis module.
Do you have any formulae for this estimation or are you using specific diagrams (Fe-Fe3C, TTT…) to determine your martensite percentage? Super interesting project by the way!
If you need help, please let me know!