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Effect of minor elements on hot workability of Ni-Cr-W superalloys

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. Applying this new alloy to reactor components, the alloy with stable qualities should be supplied in an industrial scale. From such a viewpoint, the hot workability is one of the most important indices. Thus, in order to examine the effect of addition of Mn, Si, B, Y, Ti, etc. on the hot workability, a series of high-strain-rate high-temperature tension tests, so-called Gleeble tests, was carried out on 21 heats of Ni - 18 to 19 mass% Cr - 20 to 22 mass% W alloys at temperatures ranging from 800 to 1300degC at every 50degC for most of the heats, and also at 500, 600 and 700degC for the other heats. Based on the results obtained the following conclusions are drawn: (1) The addition of Mn and Si was extremely harmful to the hot workability. (2) The addition of B was effective to improve the hot workability. (3) The addition of Y  More>>
Authors:
Tsuji, Hirokazu; Nakajima, Hajime; [1]  Shimizu, Tetsuya; Isobe, Susumu
  1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Publication Date:
Aug 01, 1991
Product Type:
Technical Report
Report Number:
JAERI-M-91-116
Reference Number:
SCA: 360101; 210300; PA: JPN-91:011142; SN: 92000630558
Resource Relation:
Other Information: PBD: Aug 1991
Subject:
36 MATERIALS SCIENCE; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; HEAT RESISTING ALLOYS; HTGR TYPE REACTORS; HOT WORKING; ADDITIVES; VHTR REACTOR; VERY HIGH TEMPERATURE; NICKEL ALLOYS; CHROMIUM ALLOYS; TUNGSTEN ADDITIONS; MANGANESE ADDITIONS; SILICON ADDITIONS; BORON ADDITIONS; YTTRIUM ADDITIONS; TITANIUM ADDITIONS; 360101; 210300; PREPARATION AND FABRICATION; POWER REACTORS, NONBREEDING, GRAPHITE MODERATED
OSTI ID:
10108996
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE92750951; TRN: JP9111142
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
JPN
Size:
28 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Tsuji, Hirokazu, Nakajima, Hajime, Shimizu, Tetsuya, and Isobe, Susumu. Effect of minor elements on hot workability of Ni-Cr-W superalloys. Japan: N. p., 1991. Web.
Tsuji, Hirokazu, Nakajima, Hajime, Shimizu, Tetsuya, & Isobe, Susumu. Effect of minor elements on hot workability of Ni-Cr-W superalloys. Japan.
Tsuji, Hirokazu, Nakajima, Hajime, Shimizu, Tetsuya, and Isobe, Susumu. 1991. "Effect of minor elements on hot workability of Ni-Cr-W superalloys." Japan.
@misc{etde_10108996,
title = {Effect of minor elements on hot workability of Ni-Cr-W superalloys}
author = {Tsuji, Hirokazu, Nakajima, Hajime, Shimizu, Tetsuya, and Isobe, Susumu}
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. Applying this new alloy to reactor components, the alloy with stable qualities should be supplied in an industrial scale. From such a viewpoint, the hot workability is one of the most important indices. Thus, in order to examine the effect of addition of Mn, Si, B, Y, Ti, etc. on the hot workability, a series of high-strain-rate high-temperature tension tests, so-called Gleeble tests, was carried out on 21 heats of Ni - 18 to 19 mass% Cr - 20 to 22 mass% W alloys at temperatures ranging from 800 to 1300degC at every 50degC for most of the heats, and also at 500, 600 and 700degC for the other heats. Based on the results obtained the following conclusions are drawn: (1) The addition of Mn and Si was extremely harmful to the hot workability. (2) The addition of B was effective to improve the hot workability. (3) The addition of Y was extremely effective to improve the hot workability. The saturation point of the effectiveness was higher than 0.008 mass%. (4) The addition of Ti was extremely effective to improve the hot workability. Around 0.08 mass% addition of Ti was enough to exhibit the effectiveness. (5) The addition of Nb, Fe and/or the enrichment of C exhibited no beneficial influence in the aspect of the hot workability substantially. (6) A new Ni-Cr-W superalloy, which shows extremely superior hot workability, has been developed. It will be possible that the new alloy is manufactured in an industrial scale. (author).}
place = {Japan}
year = {1991}
month = {Aug}
}