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Weldability of Ni-Cr-W superalloy manufactured on industrial scale

Technical Report:

Abstract

Research and development have been carried out on the new Ni-Cr-W superalloy as a structural material for process heating high-temperature gas-cooled reactors with coolant outlet temperatures of around 1000degC, and the optimum chemical composition has already been proposed. With a view to putting the newly developed Ni-Cr-W superalloy to a practical use, the proposed alloy was manufactured on an industrial scale, i.e., two tons. As a part of evaluation tests of the industrial scale material, weldability was examined in two kinds of heat treatment conditions, i.e., solution treatment and re-solution treatment conditions. The results of the present study can be summarized as follows: (1) Weldability of the solution treated material is fair, and no great trouble is expected in practical welding. (2) Weldability of the re-solution treated material is slightly inferior to that of the solution treated one, and the guide bend tests for the butt welded joint show unsatisfactory results. Judging from the fact that the alloy whose chemical composition was almost equivalent to that of the material in the present study showed unsatisfactory weldability in the previous study, the weldability of Ni-Cr-W superalloys is not so good. The results of this study suggest that it is important to  More>>
Authors:
Tsuji, Hirokazu; Nakajima, Hajime; [1]  Saito, Teiichiro; Takatsu, Tamao
  1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Publication Date:
Sep 01, 1993
Product Type:
Technical Report
Report Number:
JAERI-M-93-163
Reference Number:
SCA: 360101; PA: JPN-93:011180; EDB-94:013167; ERA-19:004448; NTS-94:014124; SN: 93001119396
Resource Relation:
Other Information: PBD: Sep 1993
Subject:
36 MATERIALS SCIENCE; NICKEL BASE ALLOYS; WELDABILITY; HEAT RESISTING ALLOYS; HTTR REACTOR; CRACK PROPAGATION; LIQUID PENETRANT INSPECTION; VICKERS HARDNESS; ELECTRON MICROPROBE ANALYSIS; SOLID SOLUTIONS; MECHANICAL STRUCTURES; TEMPERATURE RANGE 1000-4000 K; 360101; PREPARATION AND FABRICATION
OSTI ID:
10110128
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE94727593; TRN: JP9311180
Availability:
OSTI; NTIS; INIS
Submitting Site:
JPN
Size:
50 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Tsuji, Hirokazu, Nakajima, Hajime, Saito, Teiichiro, and Takatsu, Tamao. Weldability of Ni-Cr-W superalloy manufactured on industrial scale. Japan: N. p., 1993. Web.
Tsuji, Hirokazu, Nakajima, Hajime, Saito, Teiichiro, & Takatsu, Tamao. Weldability of Ni-Cr-W superalloy manufactured on industrial scale. Japan.
Tsuji, Hirokazu, Nakajima, Hajime, Saito, Teiichiro, and Takatsu, Tamao. 1993. "Weldability of Ni-Cr-W superalloy manufactured on industrial scale." Japan.
@misc{etde_10110128,
title = {Weldability of Ni-Cr-W superalloy manufactured on industrial scale}
author = {Tsuji, Hirokazu, Nakajima, Hajime, Saito, Teiichiro, and Takatsu, Tamao}
abstractNote = {Research and development have been carried out on the new Ni-Cr-W superalloy as a structural material for process heating high-temperature gas-cooled reactors with coolant outlet temperatures of around 1000degC, and the optimum chemical composition has already been proposed. With a view to putting the newly developed Ni-Cr-W superalloy to a practical use, the proposed alloy was manufactured on an industrial scale, i.e., two tons. As a part of evaluation tests of the industrial scale material, weldability was examined in two kinds of heat treatment conditions, i.e., solution treatment and re-solution treatment conditions. The results of the present study can be summarized as follows: (1) Weldability of the solution treated material is fair, and no great trouble is expected in practical welding. (2) Weldability of the re-solution treated material is slightly inferior to that of the solution treated one, and the guide bend tests for the butt welded joint show unsatisfactory results. Judging from the fact that the alloy whose chemical composition was almost equivalent to that of the material in the present study showed unsatisfactory weldability in the previous study, the weldability of Ni-Cr-W superalloys is not so good. The results of this study suggest that it is important to clarify the acceptable conditions concerning the levels of minor alloying elements and the heat treatment for the alloys in order to make the weldability of the alloys stable and that there is much prospect of a success of securing the reliability of the structures with weldments applying the technique of minor alloying element adjustment and optimizing the heat treatment condition. As the future plans, basic data on the weldability of Ni-Cr-W superalloys will be accumulated furthermore, and research and development will be carried out with a view to securing the reliability of the structures with weldments. (author).}
place = {Japan}
year = {1993}
month = {Sep}
}