20G钢氢腐蚀的超声背散检测  

ULTRASONIC BACK-SCATTER DETECTION OF HYDROGEN ATTACK IN LOW CARBON STEEL

作　　者：李晓刚[1] 陈华[1] 谢根栓[1] 姚治铭[1] 柯伟[1] 

机构地区：[1]中国科学院金属腐蚀与防护研究所,抚顺石油学院

出　　处：《腐蚀科学与防护技术》1994年第2期179-183,共5页Corrosion Science and Protection Technology

摘　　要：选用２０Ｇ低碳钢，经４５０℃和５００℃，１８ＭＰａ氢气中分别暴露２４０，４８０和７２０小时，使材料发生不同程度氢腐蚀，用背散法对氢蚀进行了超声波检测结果表明，背散法对氢蚀程度非常敏感，用杂草波平均高度与原始波高之比做为信噪比，能很好地反映氢蚀程度，论证了用背散法检测氢蚀程度的可能性．Low carbon steel 20G samples cut from a hot-rolling plate were exposed to hydrogen at 723K and 773K,18MPa for 240,480 and 720 h respectively.Hydrogen attack occurred in the samples and the methane bubbles on the surfaces of samples could be obsefVed clearly.Metallurgical investigation results showed that the methane bubbles were linked each other and mlcrocracks along grain boundanes were formed.The tensile testing results showed that the strength and ductility of the steel decreased with exposure time,l.e,the degree of hydrogen attack Increased with Increasing exposure time.Ultrasonic back-scatter technique was used to detect the degree of hydrogen attack.The results showed that the back-scatter of ultrasonic was sensitive to the degree of hydrogen attack.The ratio of signal to noise for back-scattering wave,i.e.,the ratio of the average height of clutter caused by hydrogen attack in the samples to the height of original wave,can be used to assess the degree of hydrogen attack.

关 键 词：氢腐蚀 背散法 低碳钢 超声检验 

分 类 号：TG142.31[一般工业技术—材料科学与工程]