Toughness: The ability of a material to absorb energy during plastic deformation and fracture. The better the toughness, the lower the likelihood of brittle fracture.
Testing method – Low-temperature impact test
Sampling: Finished products, semi-finished products after heat treatment
Sampling ratio: 8 pieces per batch
Specimen preparation:
1. Sampling: Near-surface sampling.
2. Specimen machining: Standard specimen dimensions according to GB/T 229-2007 (length 55 mm, square cross-section 10 mm × 10 mm, with a V-notch or U-notch at the mid-length position).
Place the notched specimen, cooled to 45 °C and having the specified geometry, between the two supports of the testing machine with the notch facing away from the striking edge. Strike the specimen once with the pendulum and measure the absorbed energy. The requirement is AKV 2 ≥ 27 J.
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