通化硕抠家具有限公司

    15Cr2Ni3MoW鋼穿孔頂頭的失效分析及改進

    Investigation of Failure of 15Cr2Ni3MoW Steel Piercing Plug and Modification

    • 摘要: 介紹了15Cr2Ni3MoW鋼穿孔頂頭在穿制27SiMn鋼時發(fā)生的主要失效形式。對比了成品頂頭和失效頂頭的金相組織和顯微硬度;利用Gleeble-1500型熱模擬機對比了27SiMn鋼和20鋼在穿制溫度下的變形抗力;通過掃描電鏡和能譜分析研究了成品頂頭表面氧化膜。結果表明:27SiMn鋼在穿制溫度下變形抗力大,鋼中Si含量高,頂頭工作溫度高,頂頭表面氧化膜組織疏松以及在頂頭表面氧化膜下面存在一層粗大的鐵素體軟區(qū),是造成頂頭失效的主要原因。提出了提高穿孔頂頭使用壽命的措施。

       

      Abstract: Described in the paper are the main types of failures of the 15Cr2Ni3MoW steel piercing plug encountered with during piercing the 27SiMn steel billet. A comparison of the metallographic structure and micro-hardness of the unused plug and the faulty plug is made. Another comparison of the deformation resistance of the 27SiMn steel with that of the 20# steel at the piercing temperature is also conducted by means of the Gleeble-1500 thermal simulator. Moreover, the oxide film on the unused plug is analyzed with the scanning electron microscope and the energy spectrometer. As a result, it is concluded that the said failures of the piercing plug are mainly caused by such elements like rather large deformation resistance of the 27SiMn steel at piercing temperature, high Si content of the steel, high operating temperature of the plug, porous structure of the plug surface oxide film as well a layer of crude ferrite soft area formed under the said oxide film. Accordingly, measures aiming at a longer service span of the plug are proposed.

       

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