磨削烧伤对超声波声速变化影响的实验研究  

Experimental study on the influence of grinding burn on the change of ultrasonic velocity

作　　者：毛汉颖[1] 付俊程 刘玉琨 邹志强 MAO Hanying;FU Juncheng;LIU Yukun;ZOU Zhiqiang(School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou 545616,China)

机构地区：[1]广西科技大学机械与汽车工程学院,广西柳州545616

出　　处：《广西科技大学学报》2023年第1期65-72,共8页Journal of Guangxi University of Science and Technology

基　　金：广西自然科学基金项目(2016GXNSFAA380119,2018GXNSFAA138206)资助。

摘　　要：磨削烧伤会显著影响零件的使用性能,检测磨削烧伤对确保零件安全使用具有重要意义。超声波声速已被应用于检测金属晶粒尺寸、残余应力和金属热处理状态等方面,其能否用于检测磨削烧伤程度倍受关注。本文搭建了临界折射纵波(critical refraction longitudinal wave,简称LCR波)声速检测系统,对不同磨削烧伤程度的45#钢试件进行超声波声速测量,实验结果表明:超声波声速对磨削烧伤不敏感,对于不同烧伤程度的45#钢试件,超声波声速仅有较小变化。根据材料金相组织、残余应力、晶粒大小等因素对超声波声速影响机理进行分析,由于各影响因素对超声波声速变化具有综合影响,超声波声速不随不同烧伤程度敏感变化,不能灵敏地检测磨削烧伤。The performance of materials is significantly affected by grinding burn.So the inspection of grinding burn is of great significance to ensure the use safety of materials.As ultrasonic velocity has been used to detect the grain size,residual stress and heat treatment state of metal,whether it can be used to detect the degree of grinding burn has attracted much attention.In this paper,a critical refraction longitudinal wave(LCR wave for short)wave detection system was established to measure the ultrasonic velocity of 45#steel specimens with various grinding burn degrees.The results show that the ultrasonic velocity was not sensitive to grinding burn,and there was only little rate of change in ultrasonic velocity for 45#steel specimens with various burn degrees.The change mechanism of ultrasonic velocity was analyzed according to metallographic structure,residual stress and grain size.Therefore,influenced by various factors,ultrasonic sound velocity can not be sensitive to different burn degrees and can not sensitively detect grinding burns.

关 键 词：磨削烧伤 超声波声速 临界折射纵波(LCR波) 金相组织 

分 类 号：TG580.6[金属学及工艺—金属切削加工及机床]