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Materials 2017, 10(5), 490; doi:10.3390/ma10050490

The Present SP Tests for Determining the Transition Temperature TSP on “U” Notch Disc Specimens

1
Department of Material Engineering, Faculty of Metallurgy and Materials Engineering, VŠB—Technical University of Ostrava, 17. Liostopadu 2172/15, 708 00 Ostrava, Czech Republic
2
MATERIAL & METALLURGICAL RESEARCH Ltd., Pohranicni 31, 703 00 Ostrava-Vitkovice, Czech Republic
3
Institute of Structural Materials, College of Engineering, Swansea University, Swansea SA2 8PP, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Yong-Cheng Lin
Received: 31 March 2017 / Revised: 27 April 2017 / Accepted: 27 April 2017 / Published: 3 May 2017
(This article belongs to the Special Issue Selected Papers from SSTT2016)
View Full-Text   |   Download PDF [1610 KB, uploaded 3 May 2017]   |  

Abstract

The principal difference between the small punch (SP) testing technique and standardized impact testing lies in the fact that the SP tests carried out in accordance with CWA 15627 Small Punch Test Method for Metallic Materials use disc-shaped test specimens without a notch. Especially in tough materials, the temperature dependence of SP fracture energy ESP in the transition area is very steep and lies close to the temperature of liquid nitrogen. In this case, the determination of SP transition temperature TSP can lead to significant errors in its determination. Efforts to move the transition area of penetration testing closer to the transition area of standardized impact tests led to the proposal of the notched disc specimen 8 mm in diameter and 0.5 mm in thickness with a “U” shaped notch 0.2 mm deep in the axis plane of the disc. The paper summarizes the results obtained to date when determining the transition temperature of SP tests TSP, determined according to CWA 15627 for material of pipes made of P92, P22, and a heat treated 14MoV6-3 steel in the as delivered state. Although the results obtained confirmed the results of other works in that the presence of a notch in a SP disc is insufficient to increase the transition temperature significantly and certainly not to the values obtained by Charpy testing, comparison of the different behaviors of the alloys tested reveals some evidence that the notch reduces the energy for initiation. This implies that the test on a notched disc is more a test of crack growth and would be a useful instrument if included in the forthcoming EU standard for SP testing. View Full-Text
Keywords: small punch testing; SP transition temperature TSP; notched disc specimen; plane disc specimen; impact energy; fracture appearance transition temperature (FATT); ductile brittle transition temperature (DBTT); transition temperature (TT) small punch testing; SP transition temperature TSP; notched disc specimen; plane disc specimen; impact energy; fracture appearance transition temperature (FATT); ductile brittle transition temperature (DBTT); transition temperature (TT)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Matocha, K.; Dorazil, O.; Hurst, R. The Present SP Tests for Determining the Transition Temperature TSP on “U” Notch Disc Specimens. Materials 2017, 10, 490.

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