Experimental Study on the Deformability of New OPH Alloys

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Omid Khalaj
Bohuslav Mašek
Ctibor Štadler
Jiři Svoboda

Abstract

The efficiency in the power plant engineering can be increase by using the improved structural
alloys with high temperature properties. A new Fe-Al-O Oxide Precipitation Hardened (OPH)
steel which was developed by the authors could be a solution for this approach. Compared to
oxide dispersion strengthened (ODS) ferritic steels, excellent mechanical properties are
guaranteed by using 10 % Al in the matrix. This paper presents the results of experimental tests
investigating the deformability of different variants of OPH alloy. a series of
thermomechanical tension/compaction tests with different strain rates were performed to
evaluate the mechanical properties of these group of materials. The results show that OPH
alloys are sensible to heat treatment as well as strain rate while annulling temperature has less
effect on the ultimate tensile strength (UTS) and elongation. Then by optimizing those
parameters a good structure oriented material can be achieved.

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