作　　者： ; ; ; ; ; (程圣泓）;

机构地区： 中南大学材料科学与工程学院

出　　处： 《钢管》 2005年第2期43-48,共6页

摘　　要： 介绍了15Cr2Ni3MoW钢穿孔顶头在穿制27SiMn钢时发生的主要失效形式。对比了成品顶头和失效顶头的金相组织和显微硬度;利用Gleeble-1500型热模拟机对比了27SiMn钢和20钢在穿制温度下的变形抗力;通过扫描电镜和能谱分析研究了成品顶头表面氧化膜。结果表明:27SiMn钢在穿制温度下变形抗力大,钢中Si含量高,顶头工作温度高,顶头表面氧化膜组织疏松以及在顶头表面氧化膜下面存在一层粗大的铁素体软区,是造成顶头失效的主要原因。提出了提高穿孔顶头使用寿命的措施。 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.

关 键 词： 穿孔顶头 钢 失效分析 改进

领　　域： [金属学及工艺] [金属学及工艺] [金属学及工艺]