Comparison of ASME K _IR curve and dynamic master curve in determining ductile–brittle transition temperature of A48P2 steel

Authors: Moitra, A.; Sreenivasan, P. R.; Venugopal, S.; Mannan, S. L.

Source: Materials Science and Technology, Volume 21, Number 10, October 2005 , pp. 1166-1170(5)

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Abstract:

The ductile–brittle transition temperature (DBTT) of grade A48P2 steel is characterised based on the American Society of Mechanical Engineers (ASME) fracture toughness K _IR curve and dynamic master curve approaches. The indexing parameter for the K _IR curve, reference temperature RT_NDT, is determined from drop weight and Charpy tests to be −45°C. The dynamic master curve is constructed following ASTM standard E1921 guidelines; however, instead of precracked tests, the dynamic fracture toughness K _Jd is determined from Charpy V notch tests using a modified Schindler's procedure. A Weibull plot is constructed using the K _Jd data, and it is found that the points comply reasonably with the forced fit line of slope 4. The reference temperature for constructing the dynamic master curve, termed T ^dy,Sch ₀, thus determined is −56°C. The ASME K _IR curve is shown to be conservative compared with the dynamic master curve constructed using T ^dy,Sch ₀.

Keywords: DYNAMIC FRACTURE TOUGHNESS; DBTT; MASTER CURVE; ASME KIR CURVE

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328405X51712

Publication date: 2005-10-01

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