Component

Heat treatment

Test duration (h)

Visual inspection result

Twister 1

None

3

Multiple cracks

Cylinder 1

None

3

Multiple cracks

Twister 2

2 h @ 950˚C

77.5

No cracks

Twister 3

2 h @ 450˚C

5.5

Multiple cracks (but less than for Twister 1)