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    Ni在穿孔頂頭制備和穿孔過程中的作用

    Effect by Ni on Piercing Plug as being Prepared and Operated

    • 摘要: 以20Cr2Ni3成品穿孔頂頭和失效穿孔頂頭為研究對象，探究Ni在穿孔頂頭制備和穿孔過程中的作用。對頂頭氧化膜的形貌和成分進行分析。研究發(fā)現(xiàn)：具有疏松多孔的兩層氧化膜結(jié)構(gòu)的成品穿孔頂頭在穿孔后發(fā)生失效，其外層氧化膜絕大部分脫落，而內(nèi)層氧化膜與基體緊密黏合在一起。Ni在頂頭制備和穿孔過程中，始終以單質(zhì)的形式存在于內(nèi)層氧化膜。分析認為：在高溫穿孔過程中，富Ni處的氧化膜結(jié)構(gòu)致密、無裂紋，而貧Ni處出現(xiàn)大裂紋；Ni充當黏結(jié)劑的作用，將氧化物緊緊地黏合在一起，起到有效保護頂頭的作用。

       

      Abstract: Taking the 20Cr2Ni3 finished piercing plug and the failure piercing plug as the research subjects,the effect by Ni on piercing plug being prepared and operated are studied. And the morphology and chemical composition of the oxide film of the plug are analyzed. It is identified via the research that when the said porous finished piercing plug with a 2-layer oxide film structure fails after piercing operation,most part of the outer oxide film peels off,while the inner oxide film sticks onto the basal body tightly;and that during the plug preparation and piercing process,Nitrogen(Ni)always exists in the form of elementary substance in the inner oxide film. The analysis leads to such a conclusion that during the high temperature piercing process,at the Ni-enriched location of the oxide film,the structure is dense and free of any crack,whereas at the Ni-poor location of the oxide film,big cracks are developed;and that in this case Ni acts as some kind of binder,and gets the oxides bond closely,which protects the plug so well.

       

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