Effect of Zirconium Oxide Addition on Mechanical Properties in Ultrafine Grained Ferritic Stainless Steels

• Taguchi Masami

  Materials Research Laboratory, Hitachi, Ltd.

• Sumitomo Hidehiko

  Japan Ultra-High Temperature Materials Research Institute

• Ishibashi Ryo

  Materials Research Laboratory, Hitachi, Ltd.

• Aono Yasuhisa

  Materials Research Laboratory, Hitachi, Ltd.

抄録

Zirconium (Zr) and 12 mass% chromium containing ferritic stainless steels with Zr oxide dispersoids have been developed. In this study, the relationship between the process conditions and the metallurgical and mechanical properties were investigated. 12Cr-1Zr steel was consolidated with a grain size of about 1 μm by extrusion process of powder without mechanical alloying (MA). On the other hand, 12Cr-1Zr steels with MA process were shown to have a grain size of only about 0.36 μm or less. It was suggested that Zr atoms strongly reacts with gaseous impurities such as oxygen and carbon that were entrapped during MA. Based on TEM observations, Zr oxide and carbide preferentially precipitated on the grain boundaries which pin the grain boundary migration during the extrusion process. The developed steels follow the Hall-Petch relation and the slope is nearly identical to that of pure iron. Charpy impact values, at room temperature, of over 3 MJ/m2 up to tensile strength of 1500 MPa were obtained which is three times higher than those of conventional ferritic stainless steels or PH-stainless steels.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 49 (6), 1303-1310, 2008

  公益社団法人 日本金属学会

キーワード

• mechanical alloying
• ferritic stainless steel
• zirconium oxide
• grain refinement
• tensile strength
• Charpy impact test

詳細情報

• CRID: 1390282679226135552
• NII論文ID: 10021147462
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.mra2008036
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 9519168
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9519168
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/49/6/49_MRA2008036/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可