https://www.sciencedirect.com/topics/engineering/homogenization-heat-treatment

To removed inhomogenity and microsegregation induced by heavy elements in interdendritic regions. To modify grain orientation before wrought process.

To reduce any possible stress concentration after casting in ingot.

To prepare the matrix and to uniform elements distribution in the matrix to be ready for precipitation.

The grain size, morphology and distribution of carbide and size and distribution of intermetallic compound are all controlled by heat treatment process.If there is no heat treatment it will crack in the subsequent rolling process

It is important to avoid cracks during the following conformation processes.

Essentially to reduce if not completely remove inhomogeneities and microsegregation , aside grain size morphology redistribution.

Homogenization is essential in cast alloys in general,wrought super alloys in particular.

1. At high temperatures, diffusion is active this will even out chemical homogenities present in the cast structure,generally solidification results in high melting alloy at interior and low melting alloy at the exterior results in CORING.this coring results in corrosion and inhomogenous material properties. Homogenzing heat treatment helps in eliminating this problems and produces SOUND CAST structures,

2. residual stresses present in the materials will also be eliminated,by annihilation process, vacany with interstitial,climb up or climb down in dislocations avoiding obstacle,annihilating positive and negative edge and screw dislocation etc,arranging of dislocations one below another polygonization etc some amount of recovery happens during homogenization itself.

3. the material then can be rolled,forged,extruded as desired.

thanks & regards,

g.sudhakar

phd(materials engineering)

h.c.u