PSI - Issue 19

Keiji Yanase et al. / Procedia Structural Integrity 19 (2019) 504–512 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

506

3

840mm

Spalling failure of a roll

Final rupture section

Mode II crack

Mode Ⅲ crack

137mm

Crack propagationdirection

Fig. 2. Spalling failure of a roll and shear-mode fatigue crack growth.

Crack initiation (Mode I )

Final rupture region

Outer layer (Higher wear resistance) Inner layer (Higher toughness)

Crack propagation (Mode II )

Final rupture region

Mode I fracture

Crack propagation (Mode III)

Work roll

10~40mm Crack propagation (150 ～ 500mm)

Fig. 3. A schematic of shear-mode fatigue crack growth.

 15

Heat treatment Ingot:8kgf ±

Melting

Casting

25 25

 7.5

75

 15

25

(in mm)

Fig. 4. Preparations of material and specimen.