低合金钢中非金属夹杂物的检测与表征

Determination and characterization of non-metallic inclusions in low alloy steel

低合金钢中非金属夹杂物的检测与表征,需要解决夹杂物分析的代表性和准确性问题。实验以脉冲分辨分析方法确定了低合金钢中非金属夹杂物的组分,并研究了其单火花脉冲分布和图谱。采用定量金相、扫描电镜和能谱仪等多种物理分析手段对目标夹杂物进行全面分析,探讨了夹杂物的主要存在状态和异常光谱信号与夹杂物的颗粒数量、尺寸之间的相关性。研究发现单位面积内夹杂物的尺寸越大,对异常火花相对频数和异常平均强度占总体平均强度的比例影响越大。在对低合金钢进行常量元素含量检测的同时,通过单火花脉冲分布和图谱还能对非金属夹杂物进行识别和检测,结合金相和扫描电镜物理分析手段实现了非金属夹杂物的定量和定性,适用于对低合金钢的日常质量控制。

Representativeness and accuracy of inclusion analysis should be figured out for the determination and characterization of non-metallic inclusions in low alloy steel.The non-metallic inclusions components in low alloy steel,as well as the single spark pulse distribution and spectra was studied.In combination with quantitative metallography,SEM and EDS,the main existence state of the inclusions in low alloy steel and the relevance between abnormal spectral signals and the particle number and size of the inclusions were explored.It was found that the particle number of larger inclusions had a greater significant impact on the relative frequency of the abnormal sparks,and the ratio of abnormal average intensity to the overall average intensity was also closely related with the average particle size of the inclusion.When the contents of the main elements in low alloy steel were measured,the system could identify and detect non-metallic inclusions with single spark pulse distribution and spectra at the same time and thus realized the qualitative and quantitative determination of non-metallic inclusions with the combination of physical means,namely,metallography and SEM,so it is suitable for the daily quality control of low alloy steels.