Hi Ajay, what do U mean by LAM?

http://www.iso.org/iso/catalogue_detail.htm?csnumber=69669

Hope I can help you!

Interaction with laser energy may be divided on 3 part: reflection, penetration and absorbtion. In case of metal laser additive manufacturing you can exclude penetration. If to take data of absorbtion of powdered material you can approximately calculate how many energy was put for melting of volume material. And then to calculate temperature. Of course all calculations will be very approximately. More accurate way to make measurements with high definition pyrometer.

this can be quite challenging as the thermal conductivity of powder can be regarded as air and back to bulk material when powders are molten. For FEM, regards powder before and after melting as a bulk material, then provide bulk with temperature dependent thermal properties. Heat transfer in pde toolbox in matlab can be good option.