タンデム式縦型高速双ロールキャスト法により作製した熱交換器材料の組織とろう付特性

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タイトル別名
  • Microstructure and Brazing Characteristics of Brazing Sheets Fabricated by Vertical-type Tandem Twin-roll Casting
  • タンデムシキ タテガタ コウソクソウロールキャストホウ ニ ヨリ サクセイ シタ ネツコウカン キザイリョウ ノ ソシキ ト ロウズケ トクセイ

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<p>  Vertical-type tandem twin-roll casting is a highly effective method for thin clad strip fabrication. In addition, precipitation refinement and high solubility can be achieved by rapidly cooling the roll casting, so property improvement can also be expected. The aim of this study is to clarify the advantage of vertical-type tandem twin-roll casting by considering the property of brazing sheet fabricated by the present method. Six mm thick clad sheets consisting of 4045/3003/4045 were fabricated by both hot-roll bonding (HRB) and vertical-type tandem twin-roll casting (TRC). The clad sheets were cold-rolled to 0.17mm in thickness, subjected to intermediate annealing at several temperatures, cold-rolled to 0.10mm in thickness, and finally brazed at 600℃ for 3min. The microstructure and brazing characteristics of clad sheets were compared. After intermediate annealing, the HRB sheets fully recrystallized at 350℃. On the other hand, fibrous structures still remained in the TRC sheets at 400℃. Fine dispersoid particles with 0.1μm diameter were observed at all intermediate annealing conditions of HRB and 400 and 500℃ of TRC. The recrystallization behavior during brazing heat treatment was affected by each initial condition. In the HRB sheets, strain energy was dominant at no/250℃ intermediate annealing. In the TRC sheets, the precipitation behavior of super saturated Mn was the key factor regardless of the intermediate annealing condition. After the brazing heat treatment, TRC recrystallized grain was elongated in the rolling direction. This elongated grain reduced the grain boundary area vertical to the interface and erosion amount. From the sagging test, the TRC sheets showed higher sagging resistance than the HRB sheets. It was confirmed that the TRC process is more advantageous for brazing sheet fabrication although it is a simple process compared to HRB.</p>

収録刊行物

  • 鋳造工学

    鋳造工学 88 (10), 615-623, 2016

    公益社団法人 日本鋳造工学会

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