Ｎｉ合金およびオーステナイト系ステンレス鋼多層溶接金属部のミクロ割れについて　Ｉ　　Ｎｉ合金多層溶接金属部のビード下ミクロ割れの特性

• 森重 徳男

  石川島播磨重工業(株)技術研究所

• 岡林 久喜

  石川島播磨重工業(株)技術研究所

書誌事項

タイトル別名

• Microcracking in Weld Metals of Nickel Alloys and Austenitic Stainless Steels (Peport 1)
• Ni合金多層溶接金属部のビード下ミクロ割れの特性

抄録

Multirun welds of 25Cr-20Ni steel, 18Cr-lONi-Nb steel and Inconel are susceptible to microcrackirg (under-bead microcracking in weld metal). in underlying weld runs. To study the mechanism of this under-bead microcracking, Inconel multirun weld deposits, were made in the form of pads on mild steel plate, using widely varying heat inputs and interpass temperature. The results obtained in the present study are as follows:<BR>1. Microcracks were observed in the previous-layer weld metal reheated by the heat of subsequent bead, when welds were made on the mild steel dipped partially in water of about 20°C in order to lower interpass temperature.<BR>2. No microcrack, however, was found when preheating was applied at about 150°C.<BR>3. The, degree of microcracking increased with decreasing heat input, particularly with increasing weld-ing speed.<BR>4. Metallographic examination and weld thermal stress analysis were carried out And the mechanism of under-bead microcracking was discussed. As a result, it is concluded that (1) the under-bead micro-cracking occurs in the heating process of the heat cycle due to subsequent bead, and (2) precipitous thermal gradient causes high thermal strain and induces microcracking.

収録刊行物

• 溶接学会誌

  溶接学会誌 51 (12), 1008-1014, 1982

  一般社団法人 溶接学会

キーワード

• Metals and Alloys
• Surfaces, Coatings and Films
• Mechanical Engineering
• Mechanics of Materials

詳細情報

• CRID: 1390001206499069056
• NII論文ID: 130003763624
• DOI: 10.2207/qjjws1943.51.1008
• ISSN: 18837204
• ISSN: 00214787
• 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