15Cr2Ni3MoW穿孔頂頭的組織形態(tài)初探
Initial Discussion on Structural Form of Piercing Plug Made of 15Cr2Ni3MoW Steel
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摘要: 研究了15Cr2Ni3MoW合金鋼金相組織演變過程及其組織形態(tài),明確了該鋼的組織形態(tài)特點(diǎn)和適應(yīng)穿孔頂頭高性能要求所應(yīng)有的組織結(jié)構(gòu)模式及與使用性能之間的關(guān)系。15Cr2Ni3MoW合金鋼生產(chǎn)的頂頭具有均勻細(xì)小的貝氏體和少量馬氏體的復(fù)合組織,其表面氧化膜應(yīng)致密,與基體結(jié)合牢固,并以FeO為主要成分。改進(jìn)頂頭的生產(chǎn)工藝后,頂頭組織改善,硬度提高,沖擊功提高45%,使用壽命提高50%以上。Abstract: Experimental studies are made on the development process of metallographic structure and the structural form of the 15Cr2Ni3MoW alloy steel to identify the structural characteristics of the steel, the proper structure types suitable for the hi-performance requirements of the piercing plug as well as the relationship between the steel structure types and their operation performances. It is required for the plug made with the 15Cr2Ni3MoW alloy steel to be of homogeneous compound structure consisting of fine bainite grains and a small amount of martensite grains and have dense surface oxide film which is mainly composed of FeO and combined firmly with the base metal. The operation practice of the plug made with the modified manufacturing process demonstrates that thanks to its changed metallographic structure, the plug is now in possession of such advantages as higher hardness, 45% increased impact energy and over 50% longer service life.
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