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Title: Linking performance of parent Grade 91 steel to the cross-weld creep performance using feature type tests
Authors: Siefert, John A.
Parker, Jonathan D.
Thomson, Rachel C.
Issue Date: 2016
Publisher: © Electric Power Research Institute (EPRI). Distributed by ASM International.
Citation: SIEFERT, J.A., PARKER, J.D. and THOMSON, R.C., 2016. Linking performance of parent Grade 91 steel to the cross-weld creep performance using feature type tests. IN: Parker, J., Shingledecker, J. and Siefert, J. (eds). Advances in Materials Technology for Fossil Power Plants, Proceedings from the Eight International Conference (EPRI 2016), Albufeira, Algarve, Portugal, 11-14 October 2016, pp. 530-543.
Abstract: Grade 91 steel has been widely utilized in power plants over the last 20 years. Its specification worldwide has dramatically increased since the acceptance of Code Case 1943 for this material in 1983. Recent evaluation of a combination of ex-service Grade 91 steel components and virgin material has provided a unique opportunity to independently assess the performance of a combination of base metal and weldments. This approach has been grounded in the fundamental objective of linking metallurgical risk factors in Grade 91 steel to the cross-weld creep performance. Establishing critical risk factors in 9Cr steels is regarded as a key consideration in the integration of a meaningful life management strategy for these complex steels. The potential metallurgical risk factors in Grade 91 steel have been fundamentally divided into factors which affect strength, ductility or both. In this study, two heats of ex-service Grade 91 steel which exhibit dramatic differences in strength and ductility have been evaluated in the exservice condition and re-heat treated to establish a relevant set of strength:ductility variables. This set of variables includes [strength:ductility]: low:low, medium:low, low:high and medium:high. The influence of these strength:ductility variables were investigated for feature type cross-weld creep tests to better evaluate the influence of the initial base material condition on cross-weld creep performance.
Description: This article is made available as an electronic reprint with the permission of ASM International for the Loughborough University Institutional Repository. Reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this article for a fee or for commercial purposes, or modification of the content of this article is prohibited.
Version: Published
URI: https://dspace.lboro.ac.uk/2134/23727
Publisher Link: http://www.asminternational.org/
ISBN: 1627081313
9781627081313
Appears in Collections:Conference Papers and Presentations (Materials)

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