---
name: heat-treatment
title: Reason Over a Heat-Treatment Schedule and Its Microstructural Effect
description: Connect a stated heat-treatment schedule to the phase and microstructural change it actually produces, for both wrought and additively manufactured starting states.
keywords:
- level:L1
- materials
---

State the schedule precisely: solution/homogenization temperature and time,
cooling rate/method (quench, air cool, furnace cool), and aging temperature(s)
and time(s) for multi-step schedules. A named heat treatment ("solutionized
and aged") without these parameters does not specify a reproducible state.

Connect the schedule to its mechanism: solutionizing dissolves prior
precipitates and homogenizes composition, cooling rate sets the supersaturation
retained, and aging controls precipitate nucleation and growth (under-aged,
peak-aged, over-aged) — state which regime the schedule targets and why.

For an as-built additively manufactured starting microstructure specifically,
recognize that heat treatment must address AM-specific features a wrought
starting point does not have: relieving residual stress from the build,
homogenizing solidification segregation, and controlling any AM-specific
phases before the standard aging response applies as it would for wrought
material.

Return the schedule and its parameters, the mechanism and target
precipitate/phase state, and the microstructural or property change it is
expected (or measured) to produce.