超声无损表征30Mn2SiV钢复杂混合组织探讨

采用超声水浸线聚焦技术和频谱分析方法,研究了控轧控冷工艺生产的非调质D级抽油杆用钢30Mn2SiV复杂混合组织状态的超声无损表征方法,确定了不同质量分数的珠光体、铁素体及上贝氏体混合组织的相对衰减系数和相对相速度.含大量上贝氏体组织、珠光体 铁素体组织以及珠光体球化组织,相对衰减系数按照由大到小顺序变化,而相对相速度则依次增大.利用该方法可以无损区分30Mn2SiV钢的复杂混合组织.

Investigation on ultrasonic nondestructive characterization of mixed microstructures of 30Mn2SiV steel

Mixed microstructures of as-rolled and tempered 30Mn2SiV steel for D-level sucker rod were nondestructively characterized using ultrasonic immersion beam focus technique and spectral analysis.The relative attenuation coefficient and relative phase velocity are investigated for the microstructures with different content of pearlite,ferrite and upper bainite.The results show that,according to the sequence of main upper bainite,lamellar pearlite plus ferrite,and globular pearlite,the relative attenuation coefficient decreases and the relative phase velocity increases gradually.The presented method could be used to nondestructively characterize the mixed microstructures of 30Mn2SiV steel.