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成果報告書詳細
管理番号20160000000320
タイトル*平成27年度中間年報 エネルギー・環境新技術先導プログラム エネルギー効率の飛躍的向上のための高性能超高純度鉄基耐熱合金等の研究開発
公開日2017/6/15
報告書年度2015 - 2015
委託先名国立大学法人東北大学未来科学技術共同研究センター 東邦亜鉛株式会社
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title: Advanced Research Program for Energy and Environmental Technologies. Research and Development of Advanced heat resistant alloys based upon an ultra high purity Iron for Innovative improvement of conversion efficacy. (FY2015-FY2017) FY2016 Annual Report

In order to develop materials to be used in A-USC boiler or other components, the objectives of this program is to develop new heat resistant Iron Base alloys based upon the Ultra-High Purity Iron with comparable high temperature performance at 700℃ with HR6W in terms of creep resistance and oxidation resistance in Advanced Ultra Super Critical condition as well as excellent high temperature deformability.

1. Electrolytic refining
First Year Achievement
(1) Change of Anode Geometry
(2) Improvement of electrodeposition surface by cleaning of electrolyte
(3) Electrodeposition surface improvement by cleaning of electrolyte

2. Refining in Ultra High Vacuum
Two ultra high purity iron base heat resistant alloys were designed and fabricated as a chemical composition of Fe-23Cr-23Ni-X12-X12 and Fe-23Cr-23Ni-X21-X22, hereafter CCM-1 and CCM-2 respectively.

3.Development of Iron refining process by wet refining process
The gaseous elements of O, N, C and S were purified by Hydrogen Plasma Arc Melting, HPAM as low as several ppm or less for raw materials. Fabrication of CCM-1 demonstrated HPAM is effective to reduce the amount of gaseous elements.

4. Survey of potential elements to be added and alloy design
Referring previous works on alloy design and our database on oxidation by water and hydrogen accelerated oxidation, basic composition was set as Fe-23Cr-23Ni. Minor elements were chosen based on the combinatorial computational chemistry and added to improve the heat resistance and oxidation.

5. Fabrication of ultra high purity Iron base heat resistant alloys
CCM-1and CCM-2 alloys were casted, cut into two halves and machined. To obtain the designed microstructure, specimens were hot forged, heat treated and plastic deformed. Tensile and creep specimens were fabricated.

6. Evaluation of heat resistance properties
7. Effects of heat treatment on mechanical properties
Mechanical testing at RT and 700℃, creep tests at 700℃ and a steam oxidation experiments were performed under ambient and high pressure super critical temperature.

Summary of the first year
In the first year, starting alloy composition was Fe-23Cr-23Ni-X-Y-Z. In order to obtain the targeted properties, various processes and treatments were applied successfully. The fabricated CCM-2 were designed to achieve the goal with the precipitation hardening and the results obtained so far has provided the clear direction of improvement to meet the target. Creep rupture time has been improved and the longest rupture time is 50% of the targeted rupture time, 900h, which is of Ni base alloy HR6W. First year target was 70% of the target rupture time and a little shorter but the reason of the results were already analyses and the next heat can be much improved. Steam oxidation resistance also can be improved by modification of the major elements. Target strength and steam oxidation resistance can be achieved by the next two or three Heats by optimization of chemical composition and processing.
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