SYMPOSIA PAPER Published: 01 January 1986
STP32997S

Development of Small Punch Tests for Ductile-Brittle Transition Temperature Measurement of Temper Embrittled Ni-Cr Steels

Source

Small punch tests were developed to determine the ductile-brittle transition temperature of nickel-chromium (Ni-Cr) steels having various degrees of temper embrittlement and various microstructures. It was found that the small punch test clearly shows the ductile-brittle transition behavior of the temper-embrittled steels. The measured values were compared with those obtained from Charpy impact and uniaxial tensile tests. The effects of punch tip shape, a notch, and the strain rate on the ductile-brittle transition behavior were examined. It was found that the combined use of a notch, high strain rates, and a small punch tip strongly affects the ductile-brittle transition behavior. Considerable variations in the data were observed when the small punch tests were performed on coarse-grained steels. Several factors controlling embrittlement measurements of steels are discussed in terms of brittle fracture mechanisms.

Author Information

Baik, J-M
Tristar Semiconductor, Inc., Santa Clara, Calif.
Kameda, J
Tristar Semiconductor, Inc., Santa Clara, Calif.
Buck, O
Tristar Semiconductor, Inc., Santa Clara, Calif.
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Details
Developed by Committee: E10
Pages: 92–111
DOI: 10.1520/STP32997S
ISBN-EB: 978-0-8031-4960-1
ISBN-13: 978-0-8031-0440-2