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几年来,遵循伟大领袖毛主席关于“实践、认识、再实践、再认识”的教导,用CTS-4B型超声波探伤仪、频率2.5MHz、机油为耦合剂,结合低倍检查、断口试验和金相分析,对大型锻件内部缺陷的性质、分布情况及大小作了摸索验证。饼形锻件以两端面为主要探测面,轴类和碗形锻件以圆周表面为主要探测面。探测面光洁度为(?)5～(?)6,起始灵敏度为与工件等厚度深的φ2平底孔,反射波高至满幅度。本文主要介绍锻钢件白点、夹渣、中心爆裂和中心疏松等缺陷的探测分析结果。
In the past few years, following the teachings of Chairman Mao, the great leader, on “practice, knowledge, practice and re-understanding,” CTS-4B ultrasonic flaw detector, frequency of 2.5MHz, oil as coupling agent, combined with low magnification inspection, And metallographic analysis, to verify the nature, distribution and size of large-scale forging internal defects. Pie-shaped forgings to the two ends as the main detection surface, shaft and bowl-shaped forgings to the circumferential surface as the main detection surface. Detection surface finish (?) 5 ~ (?) 6, the initial sensitivity and the thickness of the workpiece such as deep φ2 flat-bottomed hole, reflected waves up to full amplitude. This paper mainly introduces the detection and analysis of defects such as white spot, slag inclusion, central burst and loose center of forgings.