固溶強化フェライト基地球状黒鉛鋳鉄の溶接熱影響部組織の形成過程

• 梅谷 拓郎

  日之出水道機器株式会社

• 高田 洋吉

  日之出水道機器株式会社

• 池田 朋弘

  日之出水道機器株式会社

• 山口 富子

  九州工業大学工学部

• 恵良 秀則

  九州工業大学工学部

• 西尾 一政

  西日本工業大学

書誌事項

タイトル別名

• Transformation Process of Weld Heat Affected Zone in Solution Strengthened Ferritic Ductile Cast Iron

抄録

The purpose of this study was to examine the weldability of Si-solution strengthened ferritic ductile cast iron (SSFDI : EN-GJS-500-14) compared with a traditional ferrite-pearlite type ductile cast iron of similar strength (JIS-FCD500-7). The α+graphite→γ reverse transformation characteristics on heating process and the transformation characteristics on cooling were investigated by synthetic weld thermal cycle method. Heating SSFDI at 300°C/s (200-800°C), the reverse transformation started at 837°C and finished at 1149°C. The austenite arose around graphite nodules and the area fraction in matrix moderately increased to 100% as the temperature became higher. In the ferrite-pearlite type ductile cast iron FCD500 with 2.27%Si, the reverse transformation occurred in the temperature range from 763°C to 1105°C. The pearlite rapidly transformed to austenite and then the ferrite moderately transformed. The austenitization rate of SSFDI was also lower than the ferrite-pearlite type ductile cast iron at 1000°C. In case of the cooling parameter t8/5=25s, the martensite area fraction increased as the maximum temperature rose. Less martensite appears in SSFDI, indicating arc welding would give rise to less brittle heat affected zone (HAZ) in SSFDI.

収録刊行物

• 溶接学会論文集

  溶接学会論文集 31 (2), 96-103, 2013

  一般社団法人 溶接学会

キーワード

• Solution strengthened ferritic ductile cast iron
• Arc welding
• HAZ microstructures
• Synthetic heat affected zone test
• Transformation process

詳細情報

• CRID: 1390001204725597440
• NII論文ID: 130004889459
• DOI: 10.2207/qjjws.31.96
• COI: 1:CAS:528:DC%2BC3sXptlOhsLs%3D
• ISSN: 24348252
• ISSN: 02884771
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可