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Effect of minor elements on corrosion behavior of Ni-Cr-W superalloys in HTGR helium

Technical Report:

Abstract

Research and development have been carried out on the new Ni-Cr-W superalloys as a component material for HTGRs with coolant outlet temperatures of around 1000degC. The basic composition, Ni-18 to 19 mass% Cr-20 to 22 mass% W, of the experimental alloys was specified in the first step. In order to examine the effect of addition of Mn, Si, B, Y and Ti on corrosion behavior in simulated HTGR helium, corrosion tests were carried out on eight heats of Ni-18 to 19 mass% Cr-20 to 22 mass% W alloys at 950 and 1000degC. Thermal cycles were given at intervals of 100h between room temperature and the each test temperature. The cumulative period of exposure to simulated HTGR helium at the each test temperature was 1000h. Based on the results obtained the following conclusions are drawn: (1) All the Ni-Cr-W alloys tested showed better resistance to general corrosion than Hastelloy XR, and also indicated better stability of the surface oxide film and less susceptibility to intergranular oxidation than the conventional Ni-Cr-W alloys. (2) The addition of Mn and Si showed no advantage. The alloys containing Mn and Si rather showed inferior corrosion resistance in simulated HTGR helium. (3) The addition of B  More>>
Authors:
Tsuji, Hirokazu; Suzuki, Tomio; Tsukada, Takashi; Nakajima, Hajime [1] 
  1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Publication Date:
Sep 01, 1991
Product Type:
Technical Report
Report Number:
JAERI-M-91-136
Reference Number:
SCA: 360105; PA: JPN-91:011197; SN: 92000630613
Resource Relation:
Other Information: PBD: Sep 1991
Subject:
36 MATERIALS SCIENCE; NICKEL BASE ALLOYS; HELIUM; CORROSION; HEAT RESISTING ALLOYS; CORROSION RESISTANT ALLOYS; IMPURITIES; QUANTITY RATIO; THERMAL CYCLING; VERY HIGH TEMPERATURE; GRAIN BOUNDARIES; OXIDES; FILMS; TUNGSTEN ALLOYS; CHROMIUM ALLOYS; SURFACES; MASS TRANSFER; HTGR TYPE REACTORS; 360105; CORROSION AND EROSION
OSTI ID:
10109056
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE92751006; TRN: JP9111197
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
JPN
Size:
50 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Tsuji, Hirokazu, Suzuki, Tomio, Tsukada, Takashi, and Nakajima, Hajime. Effect of minor elements on corrosion behavior of Ni-Cr-W superalloys in HTGR helium. Japan: N. p., 1991. Web.
Tsuji, Hirokazu, Suzuki, Tomio, Tsukada, Takashi, & Nakajima, Hajime. Effect of minor elements on corrosion behavior of Ni-Cr-W superalloys in HTGR helium. Japan.
Tsuji, Hirokazu, Suzuki, Tomio, Tsukada, Takashi, and Nakajima, Hajime. 1991. "Effect of minor elements on corrosion behavior of Ni-Cr-W superalloys in HTGR helium." Japan.
@misc{etde_10109056,
title = {Effect of minor elements on corrosion behavior of Ni-Cr-W superalloys in HTGR helium}
author = {Tsuji, Hirokazu, Suzuki, Tomio, Tsukada, Takashi, and Nakajima, Hajime}
abstractNote = {Research and development have been carried out on the new Ni-Cr-W superalloys as a component material for HTGRs with coolant outlet temperatures of around 1000degC. The basic composition, Ni-18 to 19 mass% Cr-20 to 22 mass% W, of the experimental alloys was specified in the first step. In order to examine the effect of addition of Mn, Si, B, Y and Ti on corrosion behavior in simulated HTGR helium, corrosion tests were carried out on eight heats of Ni-18 to 19 mass% Cr-20 to 22 mass% W alloys at 950 and 1000degC. Thermal cycles were given at intervals of 100h between room temperature and the each test temperature. The cumulative period of exposure to simulated HTGR helium at the each test temperature was 1000h. Based on the results obtained the following conclusions are drawn: (1) All the Ni-Cr-W alloys tested showed better resistance to general corrosion than Hastelloy XR, and also indicated better stability of the surface oxide film and less susceptibility to intergranular oxidation than the conventional Ni-Cr-W alloys. (2) The addition of Mn and Si showed no advantage. The alloys containing Mn and Si rather showed inferior corrosion resistance in simulated HTGR helium. (3) The addition of B and Y was effective to improve corrosion resistance in simulated HTGR helium. (4) Although the addition of Ti was harmful to corrosion resistance in simulated HTGR helium, around 0.08 mass% addition of Ti did not reduce corrosion resistance in the environment. (5) A new Ni-Cr-W superalloy, which shows extremely superior corrosion resistance to conventional Ni-Cr-W superalloys in simulated HTGR helium, has been developed. (author).}
place = {Japan}
year = {1991}
month = {Sep}
}