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Mechanical Characteristic of Cr-Ni Steels

#0662


Development of the Long Term prediction Methods for Stress Rupture Strength (SRS) of Chloronium-nickel Austenitic steel on the basis of Shortcut Tests.

Tech Area / Field

  • FIR-MAT/Materials and Materials Conversion/Fission Reactors

Status
3 Approved without Funding

Registration date
28.05.1996

Leading Institute
State Enterprise Krasnaya Zvezda, Russia, Moscow

Supporting institutes

  • TsNIIKM PROMETEY (Construction Materials), Russia, St Petersburg\nNIIAR (Atomic Reactors), Russia, Ulianovsk reg., Dimitrovgrad

Collaborators

  • European Commission / Joint Research Center / Institute for Advanced Materials, The Netherlands, Petten\nTohoku University, Japan, Sendai\nTechnische Universität Darmstadt, Germany, Darmstadt\nPacific Northwest National Laboratory, USA, WA, Richland

Project summary

The sorest material strength problem is known to lie in the prevention from constructions failure at the extreme temperature and stress conditions during long-term operation.

Essentially so is the service life prediction on the basis of shortcut tests because full-time tests are rather expensive if not impossible. So, it is imperative to provide SRS prediction method on the basis of shortcut tests.

Specifically, serviceability of high temperature (600-800 °C) reactors on natural gas ethylene and other petroleum chemistry and energetic applications put forward the problem of SRS extrapolation pertaining the new unique corrosion resistant steel of 07X15H30B5M2.

The project is aimed to produce long term (up to 100000 hours) SRS prediction method for austenitic stainless steel type of 07X15H30B5M2, 08X16H11M3, 10Х18Н10Т-ВД on the basis of stress-rupture and creep strength tests (600-800 °C, 1500 h).

Method in the project is deduced from A.L.Arshakuni and S.A.Shesterikov [3], where the common-use technique of SRS data processing (conceptionally new SRS curve presented) is illustrated by mass results, covering the great variety of alloys in use.

Proposed here long term SRS prediction method for non-irradiated materials could serve successfully for the neutron-irradiated specimens as well. Project goals can be stated as:


1. Analysis of SRS and creepage prediction methods for austenitic and Cr-Ni steels, identification of criteria and techniques to predict long term mechanical characteristics of steels of different types.
2. Steel creep strength tests over 1500 h with primary creep curves recorded.
3. SRS and creep tests of steels, having been neutron irradiated at 600-800 °C on the same time base with primary creep curves recorded at the same temperatures. Steel samples irradiation is to be run up to the fast neutron fluency from 4 ґ 1021 fn/sq cm at 600 °C to 1 ґ 1022 fn/sq cm at 700 and 800 °C.
4. Material science SRS tests of materials and samples over (1,5-5,0) ґ 104 h in order to produce critical points and evaluate feasibility and reliability of the method at work.
5. Find correlations between characteristics at various deformation rates and temperatures (10-3, 10-5, 10-7 1/s and 650, 700, 750, 800 °C, accordingly) for two types of steel with SRS characteristics recorded at the fixed stress conditions.

The initiated project is supposed to arrive at scientific breakthrough in strength long-term predictions up to 100 000 hours ahead out from the data experimentally produced within 1500 hours. Irradiated samples data will allow to evaluate the variables in SRS relation and to prior predict stress-rupture strength of irradiated austenitic stainless steels for 100 000 h ahead.

The project is to be contributed by the outstanding scientists and engineers with much expertise and knowledge in the strength aspects of materials and constructions:

academician of AES, doctor of technical sciences Gryaznov G.M., corresponding member of RANS, doctor phys-matem. sciences Shesterikov S.A., doctors of tech. sciences Kashelkin V.V., Demidov A.S., Karzov G.P., candidates of technical sciences Voshedchenko B.M., Markov V.G., Golovanov V.N. et al.


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