ISSN: 1945-7553
Page Count: 9

Determination of Ductile-Brittle Transition Temperature (DBTT) in Dynamic Small Punch Test

Joo, Y-H
Research Institute for Fracture Technology, Tohoku University, Aza Aoba Aramaki Aobaku, Sendai

Hashida, T
Research Institute for Fracture Technology, Tohoku University, Aza Aoba Aramaki Aobaku, Sendai

Takahashi, H
Research Institute for Fracture Technology, Tohoku University, Aza Aoba Aramaki Aobaku, Sendai

(Received 6 February 1991; accepted 10 June 1991)

Abstract

A dynamic small punch test technique is demonstrated for measuring the ductile-brittle transition temperature (DBTT) of aged Cr-Mo-V turbine rotor steels. Based on fracture energy measurements and fracture surface observations it is shown that the dynamic small punch test specimens exhibit a clear ductile-brittle transition behavior. The DBTT can be determined reliably by statistically analyzing the scatter in the fracture energy data and by defining the fracture appearance transition temperature. The measured values of DBTT are compared with those obtained from Charpy impact tests.

Keywords:
dynamic small punch test, ductile-brittle transition temperature, statistical analysis, fracture appearance transition temperature, Charpy impact test

Paper ID: JTE11891J
DOI: 10.1520/JTE11891J
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