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《Pressure Vessel Technology》 2018-08
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Effect of Martensite on the Acoustic Emission Characteristics of TA2 Plate Used for Titanium Pressure Vessels

LI Li-fei;SHEN Gong-tian;ZHANG Zheng;Defence Patent Examination Center;China Special Equipment Inspection and Research Institute;School of Materials Science and Engineering,Beihang University;  
Due to the outstanding corrosion resistance,titanium pressure vessels have been widely used in chemical process plants. To ensure safety,acoustic emission( AE) technology is used to assess the safety of their service status in a timely and effective manner. Theoretical analysis and experimental research on AE characteristics of two types of microstructure,i.e.,quenched martensite and weld martensite,were carried out with respect to the common engineering conditions of TA2. Through the constant rate tensile test and crack propagation monitoring test,the AE characteristics of physical source mechanisms of deformation and fracture were obtained. Using the history analysis and in combination with microscopic observation,it was confirmed that the plastic deformation of α' martensite clusters and the cracking of the martensite strip boundaries are the main physical sources of the two growth stages of AE in the tension process. Crack propagation between the strips or between the matrix and the martensite boundaries is a strong AE source during the steady growth of fatigue cracks,and is the physical cause for steplike rise of AE count rate versus stress intensity factor range curve. The research results provide empirical data and analysis methods for AE inspection of pressure equipment of relevant materials,laying the foundation for engineering practice.
【Fund】: “十二五”国家科技支撑计划课题(2011BAK06B03)
【CateGory Index】: TH49
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