电解提取风电齿轮钢夹杂物研究

Study on Electrolytic Extraction of Inclusions in the Gear Steel for Wind Energy

采用小样电解法对风电齿轮钢18CrNiMo7-6中的夹杂物进行了系统的分析检测,通过对齿轮钢中夹杂物的电解、提取、分离,较为完整地将钢中的夹杂物电解并收集,借助SEM-EDS对所收集的夹杂物进行了定性分析。结果表明:通过小样电解法可以较为完整地得到风电齿轮钢18CrNiMo7-6中夹杂物的三维形貌;Al2O3、Al2O3-SiO2类夹杂物多呈不规则多边形状,平均尺寸分别为29.7μm、15.81μm,A l2O3-MgO-CaO-SiO2复合类夹杂物通常为包裹形态的球状,平均尺寸为13.1μm,Ca O类夹杂物通常呈块状,平均尺寸为11.7μm,MnS类夹杂物形貌多呈长条状或纺锤状,平均尺寸为18.8μm,Ca S类夹杂物通常呈规则长条状,平均尺寸为9.2μm;与传统金相法相比,小样电解法在观察钢中夹杂物真实的三维形貌和尺寸时是更为行之有效的方法。

The inclusion analysis of the gear steel 18CrNiMo7-6 for wind energy has been systematically investigated in the way of the small sample electrolyzation.Through the electrolyzation,extraction and separation of the inclusions in the gear steel,which were electrolyzed and collected in a complete manner.With utilizing the methods of SEM-EDS,the qualitative analysis of inclusions was obtained.The results show that the three-dimensional morphology of inclusions in the gear steel 18CrNiMo7-6 for wind energy can be obtained relatively completely by the mean of the small sample electrolyzation;the Al2O3 and Al2O3-SiO2 inclusions are irregularly polygonal,with an average size of 29.7μm and 15.81μm.The Al2O3-MgO-CaO-SiO2 composite inclusions are generally spherical in shape,with an average size of 13.1μm,the CaO inclusions are usually in the form of a block with an average size of 11.7μm,the morphology of the MnS inclusions is mostly elongated or spindle-shaped,with an average size of 18.8μm and the CaS inclusions are usually regular strips with an average size of 9.2μm.Compared with the traditional metallographic method,the small sample electrolyzation is a more effective method for observing the true three-dimensional morphology and size of inclusions in steel.