成果報告書詳細
管理番号20110000001735
タイトル*平成22年度中間年報 水素製造・輸送・貯蔵システム等技術開発 水素ステーション機器要素技術に関する研究開発 水素用アルミニウム材料の評価・開発(3)
公開日2012/2/17
報告書年度2010 - 2010
委託先名株式会社神戸製鋼所
プロジェクト番号P08003
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 1.1 事業概要 高圧水素ガス容器等への使用が、基準JARI-S0011)で認められているアルミニウム合金は、中強度合金の6061-T6 のみである。バルブハウジングやVH4 複合容器の口金においては、自緊処理が施されないため、高強度材適用による軽量化の効果は大きく、自動車の航続距離の向上やトータルのコスト低減につながるものと考える。
茨城大学、古河スカイ株式会社、日本軽金属株式会社ならびに弊社(株)神戸製鋼所からなる共同事業体の中で、弊社は特に「口金等容器関連アルミニウム部材の研究開発」に注力し、高強度6000系合金材適用による軽量化さらには、低コスト化の可能性を整理する。高強度材としては、長期間の実績があり、また海外特許に抵触する恐れの少ない材料として、まずは6066 合金の調質T6材を候補材に選定し、鍛造で作製した口金部模擬品を用いて、基本的な材料特性評価に続き、脆化感受性を極低速引張試験(SSRT)等により調査する。これより、6066-T6 等の高強度材適用による軽量化、低コスト化の程度を整理するとともに課題も抽出する。
英文要約Title:Development of Technologies for Hydrogen Production, Delivery, and Storage Systems. Research and Development of Elemental Technologies for Hydrogen Station Components. Assessment and Development of Aluminum Materials for Hydrogen (3) (FY2010-FY2012) FY2010 Annual Report

Among aluminum alloys, the only material that is allowed to be applied to the liner materials, cap members, etc. of high pressure hydrogen gas compound containers is medium strength alloy 6061-T6. As for compound containers, autofrettage treatment is not applied to VH4 containers; therefore, we think that the effect of container weight reduction due to the application of high strength materials is large. Among the four entities, namely, Ibaraki University, Furukawa-Sky Aluminum Corp., Nippon Light Metal Company, Ltd. and Kobe Steel Ltd., we, Kobe Steel Ltd., take charge of the research and development of container-related aluminum members such as caps, and decided to analyze the possibility of reduction in weight and cost of containers due to the application of high strength 6000 series alloys. In fiscal 2010, we selected 6066 alloy from among high strength 6000 series aluminum alloys and cast ingots with standard chemical composition. After homogenization heat treatment was applied to the ingots, common samples were made by hot forging and heat treatment (T6). The proof stresses of 6066-T6 and 6061-T6 are 380 MPa and 315 MPa, respectively. 6066-T6 is a high strength material with a proof stress about 20% higher than that of 6061-T6. SSRT (slow strain rate technique, strain rate: 6.7 x 10-7s-1) tests in highly-wet atmosphere were carried out to investigate the hydrogen embrittlement properties of 6066-T6 and 6061-T6. The elongation value (GL10mm) of 6066-T6 was 15.6% in a dry atmosphere and 17.0% in a wet atmosphere, respectively. Its embrittlement susceptibility index was -0.082. Meanwhile the elongation value of 6061-T6 was 16.3% and 18.6 %, respectively. Its embrittlement susceptibility index was -0.12. The embrittlement susceptibility index of high strength alloy 6066-T6 was higher than that of medium strength alloy 6061-T6; however, we found that the difference was small. At the beginning of fiscal 2011, we will continue to evaluate their embrittlement susceptibility through slow strain rate tests (SSRT). And we will newly evaluate their embrittlement susceptibility through fatigue tests. Also the relationship between these characteristic values and the microstructures will be analyzed, and the microstructure configuration required to reduce the embrittlement susceptibility of 6066-T6 will be clarified. In the latter half of fiscal 2011, we will start to evaluate their characteristics using the improved compositions of 6066.
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