• CN:11-2187/TH
  • ISSN:0577-6686

›› 1998, Vol. 34 ›› Issue (3): 90-95.

• 论文 • 上一篇    下一篇

冷轧工作辊局部冷焊焊缝中残余奥氏体对抗疲劳性的影响

任登义;魏星;陈立宗   

  1. 山东工业大学材料科学与工程学院
  • 发布日期:1998-05-01

INFLUENCE OF RESIDUAL AUSTENITE FOR ANTI-FATIGUE ABILITY IN THE PARTIAL COLD-WELDED METAL ON THE COLD WORK ROLLER

Ren Dengyi;Wei Xing;Chen Lizong   

  1. Shandong University of Technology
  • Published:1998-05-01

摘要: 在9Cr2Mo轧辊局部冷焊焊缝中,研究了焊缝服役后的疲劳现象与残余奥氏代(A r)数量形态的关系。结果表明:块状A r是焊缝早期疲劳的主要原因;其疲劳机制是块状A r塑变切断破坏和高应力诱发相变孪晶。强碳化物形成元素与C符合定比规律后,固溶入其体的弱、非碳化物元素影响着A r的数量和形态。薄膜状A r与板条马氏体(M l)形成的M l/A r束,可显著地提高冷轧抗疲劳性。

关键词: 残余奥氏体, 冷焊, 疲劳, 轧辊堆焊

Abstract: The relation between fatigue of the used weld metal and the quantity and morphology of residual austenite (Ar) are studied in the partial cold-welded metal on the 9Cr2Mo steel roll. Test result indicated that the block-like Ar was the main cause of early stage crack of the weld metal. The crack mechanism was that the block-like Ar fractured by plastic deformation and high stress induced to phase change twinning. As the quantity of strong carbide elements and carbon element accorded with the fixed-ratio theorem, the feeble carbide elements and non-carbide elements witch dissolved in base-phase affected the quantity and morphology of Ar.M1/Ar phase which was formed from thin film-like Ar and low carbon martensite can improve the anti-fatigue ability remarkably.

Key words: Residual austenite(Ar) Fatigue Hardfacing welding of rolls Cold-welding

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