Mechanisms of Surface Deterioration of High-Ni Grain Roll for Hot Strip Rolling.

• Choi Jin-Won

  Technical Research Laboratories, Pohang Iron & Steel Co. Ltd. (POSCO)

• Kim Donggyu

  Department of Metallurgical Engineering, Dong-A University

抄録

Wear test was carried out by using the two disc type wear testing simulator to clarify the effects of the following factors on the surface deterioration in high alloyed grain cast irons. Namely, contact stress, microstructures, high temperature wear behavior and initiation and propagation of the surface microcrack which is generally occurring during the hot rolling were studied. The test conditions are as follows; mated specimen temperature of 850ºC, contact stress of 200 and 250 MPa and up to 1.25×10⁴ revolutions with slip rate of 0.4 m/s. The mechanism of the deterioration of roll surface was discussed. During the early stage of hot rolling, surface of work roll is covered with the black film evenly formed by oxidation of roll material at high temperature, followed by the banding of black film. The wear resistant carbides initially surrounded with matrix are emerged by being worn out of the matrix during successive rolling. The emerged carbides induce the sticking phenomena by the evolution of uneven friction heat, and then the particles stuck on the roll surface disappear by the successive wear during hot rolling.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 39 (8), 823-828, 1999

  一般社団法人 日本鉄鋼協会

キーワード

• surface deterioration
• high alloyed grain cast iron roll
• wear behavior at elevated temperature
• black film
• sticking phenomena
• crystallized graphite
• initiation and propagation of microcrack

詳細情報

• CRID: 1390282681429158912
• NII論文ID: 10002464119
• NII書誌ID: AA10680712
• DOI: 10.2355/isijinternational.39.823
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/39/8/39_8_823/_pdf
• 本文言語コード: en
• 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