PSI - Issue 21

Taiko Aikawa et al. / Procedia Structural Integrity 21 (2019) 173–184 Taiko Aikawa/ Structural Integrity Procedia 00 (2019) 000 – 000

180

8

Fig. 10 Correlation between average twist angle and absorbed energy at -90°C.

Table 4 Scanning distance and the number of grain boundaries of each specimen

Number of grain boundaries

Number of grain boundaries per 1µm

Specimen

Scan distance (µm)

TMCP L-surface notch TMCP L-cross section notch NQT L-surface notch NQT L-cross section notch

119 90 141 116

0.20 0.15 0.12 0.10

600

1200

Table 5 The relationship between k and the absorbed energy at -90° C for each specimen

Specimen

k

Absorbed Energy vE at -90° C (J)

TMCP L-surface notch TMCP L-cross section notch NQT L-surface notch NQT L-cross section notch

6.5 3.7 3.7 2,8

21.0 12.8 13.2 8.56

Fig. 11 Correlation of k and absorbed energy at -90 ° C