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Research Papers: Nuclear Power

# Quantification of the Long-Term Performance of Steels T91 and 316L in Oxygen-Containing Flowing Lead-Bismuth Eutectic at $550°C$

[+] Author and Article Information
Carsten Schroer, Juergen Konys

Institut fuer Materialforschung III, Karlsruher Institut fuer Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

J. Eng. Gas Turbines Power 132(8), 082901 (May 27, 2010) (7 pages) doi:10.1115/1.4000364 History: Received July 22, 2009; Revised August 05, 2009; Published May 27, 2010; Online May 27, 2010

## Abstract

The long-term performance of ferritic/martensitic steel T91 and austenitic 316L in oxygen-containing flowing lead-bismuth eutectic at $550°C$ was investigated by exposing the materials for up to 15,000 h in the CORRIDA loop. The velocity of the liquid-metal flow was 2 m/s and the concentration of dissolved oxygen averaged $1.6×10−6 mass %$. The resulting corrosion processes and products were analyzed and quantified using metallographic methods.

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## Figures

Figure 1

Parameters of the exposure experiment in flowing oxygen-containing LBE other than temperature (550[+5]°C) and flow velocity (2[±0.2] m/s)

Figure 2

Oxide scales on the surface of T91 after exposure for 4015 h (a), 503 h (b), and 1991 h (c) to flowing oxygen-containing LBE at 550°C (v=2 m/s; cO≈1.6×10−6 mass %)

Figure 3

Examples of ingress of liquid metal into the oxide scale on T91 after exposure for 4015 h (a), 10,012 h (b), and 15,028 h (c) to flowing oxygen-containing LBE at 550°C (v=2 m/s; cO≈1.6×10−6 mass %)

Figure 4

Material loss (metal recession) and thickness of the spinel layer (Δxsp) and IOZ (ΔxIOZ) as a function of time for T91 after exposure to flowing oxygen-containing LBE at 550°C (v=2 m/s; cO≈1.6×10−6 mass %)

Figure 5

Oxide scales not significantly affected by ingress of liquid metal on T91 after exposure for 15,028 h to flowing oxygen-containing LBE at 550°C (v=2 m/s; cO≈1.6×10−6 mass %)

Figure 6

Oxide scales on 316L after exposure for 503 (a), 4015 (b), and 15,028 h (c) to flowing oxygen-containing LBE at 550°C (v=2 m/s; cO≈1.6×10−6 mass %)

Figure 7

(a) Local degradation of 316L by selective leaching after exposure for 7518 h to flowing oxygen-containing LBE at 550°C (v=2 m/s; cO≈1.6×10−6 mass %). (b) Results of qualitative EDX analyses along the line indicated in the electron-optical micrograph.

Figure 8

Material loss due to local corrosion phenomena as a function of time for 316L after exposure to flowing oxygen-containing LBE at 550°C (v=2 m/s; cO≈1.6×10−6 mass %). Top: (Maximum) thickness of the depleted zone resulting from selective leaching of Ni and Cr. Bottom: Metal recession accompanying enhanced oxidation.

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