Question

Necessary steps for T6 precipitation hardening in chronological order are

1.  Ageing, solutionizing then quenching

2.  Solutionizing, quenching then ageing

3.  Ageing, quenching then solutionizing 

4.  Solutionizing, ageing then quenching

​

Answer 1

here right ans is solutionizing,quenching,ageing

Answer 2

2. Solutionizing, quenching then ageing is the correct answer.

Precipitation hardening mainly enabled with the age hardening or particle hardening that have the heat treatments.

You could mainly order the strengthening occurs with precipitating ordered structure having difference in lattice parameters of 2 phases and coherency strain energy are maintained.

Expression for the required shear stress is as followed with the high end aspects.