Nondestructive Evaluation on Hydrogen Effect of 316L Stainless Steel

• Published in: International Journal of Precision Engineering and Manufacturing-Green Technology, 3(1) pp. 99 - 103
• Main Authors: 배동수, 이진경, 이상필, 정경국, 황성국, 이준현
• Format: Journal Article
• Language: English
• Published: 한국정밀공학회 01.01.2016
• Subjects: 기계공학
• ISSN: 2288-6206; 2198-0810

A stainless steel material is used as components for storing hydrogen gas and liquid hydrogen, or for transportation raw material and oil in storage container. Brittle fracture associated with hydrogen is observed for stainless steel and these phenomena of hydrogen embrittlement were very important for wide-ranging application of stainless steel. Many researchers have studied the hydrogen embrittlement from the mechanical and metallographic point of views. The aim of this study is to identify the material degradation by hydrogen embrittlement for 316L stainless steel using nondestructive evaluation. That is, the relationship between the mechanical properties of 316L stainless steel by hydrogen charging and nondestructive technique of acoustic emission technique and an ultrasonic wave is to be clarified. The relationship between fractography and ultrasonic wave characteristics on hydrogen charged material for 0hr and 24hr was discussed. SEM and optical microscope were used to inspect the fracture surface of hydrogen charged material. The fracture surface of the charged specimen became brittle, especially on the surface nearby. AE parameters of event, count, energy, amplitude and frequency were analyzed according to the degree of the damage of hydrogen charged stainless steel. KCI Citation Count: 4